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File _service:download_src_package:patch-2.7.6-switch-from-fork-execlp-to-execute.patch of Package patch
diff -up patch-2.7.6/lib/execute.c.switch-from-fork-execlp-to-execute patch-2.7.6/lib/execute.c --- patch-2.7.6/lib/execute.c.switch-from-fork-execlp-to-execute 2019-07-29 14:40:53.264464824 +0200 +++ patch-2.7.6/lib/execute.c 2019-07-29 14:40:53.264464824 +0200 @@ -0,0 +1,273 @@ +/* Creation of autonomous subprocesses. + Copyright (C) 2001-2004, 2006-2018 Free Software Foundation, Inc. + Written by Bruno Haible <haible@clisp.cons.org>, 2001. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. */ + + +#include <config.h> + +/* Specification. */ +#include "execute.h" + +#include <errno.h> +#include <fcntl.h> +#include <stdbool.h> +#include <stdlib.h> +#include <signal.h> +#include <unistd.h> + +#include "error.h" +#include "fatal-signal.h" +#include "wait-process.h" +#include "gettext.h" + +#define _(str) gettext (str) + +#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ + +/* Native Windows API. */ +# include <process.h> +# include "w32spawn.h" + +#else + +/* Unix API. */ +# include <spawn.h> + +#endif + + +#if defined EINTR && ((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__) + +/* EINTR handling for close(), open(). + These functions can return -1/EINTR even though we don't have any + signal handlers set up, namely when we get interrupted via SIGSTOP. */ + +static int +nonintr_close (int fd) +{ + int retval; + + do + retval = close (fd); + while (retval < 0 && errno == EINTR); + + return retval; +} +#define close nonintr_close + +static int +nonintr_open (const char *pathname, int oflag, mode_t mode) +{ + int retval; + + do + retval = open (pathname, oflag, mode); + while (retval < 0 && errno == EINTR); + + return retval; +} +#undef open /* avoid warning on VMS */ +#define open nonintr_open + +#endif + + +/* Execute a command, optionally redirecting any of the three standard file + descriptors to /dev/null. Return its exit code. + If it didn't terminate correctly, exit if exit_on_error is true, otherwise + return 127. + If slave_process is true, the child process will be terminated when its + creator receives a catchable fatal signal. */ +int +execute (const char *progname, + const char *prog_path, char **prog_argv, + bool ignore_sigpipe, + bool null_stdin, bool null_stdout, bool null_stderr, + bool slave_process, bool exit_on_error, + int *termsigp) +{ +#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ + + /* Native Windows API. */ + int orig_stdin; + int orig_stdout; + int orig_stderr; + int exitcode; + int nullinfd; + int nulloutfd; + + /* FIXME: Need to free memory allocated by prepare_spawn. */ + prog_argv = prepare_spawn (prog_argv); + + /* Save standard file handles of parent process. */ + if (null_stdin) + orig_stdin = dup_safer_noinherit (STDIN_FILENO); + if (null_stdout) + orig_stdout = dup_safer_noinherit (STDOUT_FILENO); + if (null_stderr) + orig_stderr = dup_safer_noinherit (STDERR_FILENO); + exitcode = -1; + + /* Create standard file handles of child process. */ + nullinfd = -1; + nulloutfd = -1; + if ((!null_stdin + || ((nullinfd = open ("NUL", O_RDONLY, 0)) >= 0 + && (nullinfd == STDIN_FILENO + || (dup2 (nullinfd, STDIN_FILENO) >= 0 + && close (nullinfd) >= 0)))) + && (!(null_stdout || null_stderr) + || ((nulloutfd = open ("NUL", O_RDWR, 0)) >= 0 + && (!null_stdout + || nulloutfd == STDOUT_FILENO + || dup2 (nulloutfd, STDOUT_FILENO) >= 0) + && (!null_stderr + || nulloutfd == STDERR_FILENO + || dup2 (nulloutfd, STDERR_FILENO) >= 0) + && ((null_stdout && nulloutfd == STDOUT_FILENO) + || (null_stderr && nulloutfd == STDERR_FILENO) + || close (nulloutfd) >= 0)))) + /* Use spawnvpe and pass the environment explicitly. This is needed if + the program has modified the environment using putenv() or [un]setenv(). + On Windows, programs have two environments, one in the "environment + block" of the process and managed through SetEnvironmentVariable(), and + one inside the process, in the location retrieved by the 'environ' + macro. When using spawnvp() without 'e', the child process inherits a + copy of the environment block - ignoring the effects of putenv() and + [un]setenv(). */ + { + exitcode = spawnvpe (P_WAIT, prog_path, (const char **) prog_argv, + (const char **) environ); + if (exitcode < 0 && errno == ENOEXEC) + { + /* prog is not a native executable. Try to execute it as a + shell script. Note that prepare_spawn() has already prepended + a hidden element "sh.exe" to prog_argv. */ + --prog_argv; + exitcode = spawnvpe (P_WAIT, prog_argv[0], (const char **) prog_argv, + (const char **) environ); + } + } + if (nulloutfd >= 0) + close (nulloutfd); + if (nullinfd >= 0) + close (nullinfd); + + /* Restore standard file handles of parent process. */ + if (null_stderr) + undup_safer_noinherit (orig_stderr, STDERR_FILENO); + if (null_stdout) + undup_safer_noinherit (orig_stdout, STDOUT_FILENO); + if (null_stdin) + undup_safer_noinherit (orig_stdin, STDIN_FILENO); + + if (termsigp != NULL) + *termsigp = 0; + + if (exitcode == -1) + { + if (exit_on_error || !null_stderr) + error (exit_on_error ? EXIT_FAILURE : 0, errno, + _("%s subprocess failed"), progname); + return 127; + } + + return exitcode; + +#else + + /* Unix API. */ + /* Note about 127: Some errors during posix_spawnp() cause the function + posix_spawnp() to return an error code; some other errors cause the + subprocess to exit with return code 127. It is implementation + dependent which error is reported which way. We treat both cases as + equivalent. */ + sigset_t blocked_signals; + posix_spawn_file_actions_t actions; + bool actions_allocated; + posix_spawnattr_t attrs; + bool attrs_allocated; + int err; + pid_t child; + + if (slave_process) + { + sigprocmask (SIG_SETMASK, NULL, &blocked_signals); + block_fatal_signals (); + } + actions_allocated = false; + attrs_allocated = false; + if ((err = posix_spawn_file_actions_init (&actions)) != 0 + || (actions_allocated = true, + (null_stdin + && (err = posix_spawn_file_actions_addopen (&actions, + STDIN_FILENO, + "/dev/null", O_RDONLY, + 0)) + != 0) + || (null_stdout + && (err = posix_spawn_file_actions_addopen (&actions, + STDOUT_FILENO, + "/dev/null", O_RDWR, + 0)) + != 0) + || (null_stderr + && (err = posix_spawn_file_actions_addopen (&actions, + STDERR_FILENO, + "/dev/null", O_RDWR, + 0)) + != 0) + || (slave_process + && ((err = posix_spawnattr_init (&attrs)) != 0 + || (attrs_allocated = true, + (err = posix_spawnattr_setsigmask (&attrs, + &blocked_signals)) + != 0 + || (err = posix_spawnattr_setflags (&attrs, + POSIX_SPAWN_SETSIGMASK)) + != 0))) + || (err = posix_spawnp (&child, prog_path, &actions, + attrs_allocated ? &attrs : NULL, prog_argv, + environ)) + != 0)) + { + if (actions_allocated) + posix_spawn_file_actions_destroy (&actions); + if (attrs_allocated) + posix_spawnattr_destroy (&attrs); + if (slave_process) + unblock_fatal_signals (); + if (termsigp != NULL) + *termsigp = 0; + if (exit_on_error || !null_stderr) + error (exit_on_error ? EXIT_FAILURE : 0, err, + _("%s subprocess failed"), progname); + return 127; + } + posix_spawn_file_actions_destroy (&actions); + if (attrs_allocated) + posix_spawnattr_destroy (&attrs); + if (slave_process) + { + register_slave_subprocess (child); + unblock_fatal_signals (); + } + + return wait_subprocess (child, progname, ignore_sigpipe, null_stderr, + slave_process, exit_on_error, termsigp); + +#endif +} diff -up patch-2.7.6/lib/execute.h.switch-from-fork-execlp-to-execute patch-2.7.6/lib/execute.h --- patch-2.7.6/lib/execute.h.switch-from-fork-execlp-to-execute 2019-07-29 14:40:53.264464824 +0200 +++ patch-2.7.6/lib/execute.h 2019-07-29 14:40:53.264464824 +0200 @@ -0,0 +1,44 @@ +/* Creation of autonomous subprocesses. + Copyright (C) 2001-2003, 2008-2018 Free Software Foundation, Inc. + Written by Bruno Haible <haible@clisp.cons.org>, 2001. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. */ + +#ifndef _EXECUTE_H +#define _EXECUTE_H + +#include <stdbool.h> + +/* Execute a command, optionally redirecting any of the three standard file + descriptors to /dev/null. Return its exit code. + If it didn't terminate correctly, exit if exit_on_error is true, otherwise + return 127. + If ignore_sigpipe is true, consider a subprocess termination due to SIGPIPE + as equivalent to a success. This is suitable for processes whose only + purpose is to write to standard output. + If slave_process is true, the child process will be terminated when its + creator receives a catchable fatal signal. + If termsigp is not NULL, *termsig will be set to the signal that terminated + the subprocess (if supported by the platform: not on native Windows + platforms), otherwise 0. + It is recommended that no signal is blocked or ignored while execute() + is called. See pipe.h for the reason. */ +extern int execute (const char *progname, + const char *prog_path, char **prog_argv, + bool ignore_sigpipe, + bool null_stdin, bool null_stdout, bool null_stderr, + bool slave_process, bool exit_on_error, + int *termsigp); + +#endif /* _EXECUTE_H */ diff -up patch-2.7.6/lib/fatal-signal.c.switch-from-fork-execlp-to-execute patch-2.7.6/lib/fatal-signal.c --- patch-2.7.6/lib/fatal-signal.c.switch-from-fork-execlp-to-execute 2019-07-29 14:51:00.441882754 +0200 +++ patch-2.7.6/lib/fatal-signal.c 2019-07-29 14:51:00.441882754 +0200 @@ -0,0 +1,286 @@ +/* Emergency actions in case of a fatal signal. + Copyright (C) 2003-2004, 2006-2018 Free Software Foundation, Inc. + Written by Bruno Haible <bruno@clisp.org>, 2003. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. */ + + +#include <config.h> + +/* Specification. */ +#include "fatal-signal.h" + +#include <stdbool.h> +#include <stdlib.h> +#include <signal.h> +#include <unistd.h> + +#include "sig-handler.h" +#include "xalloc.h" + +#define SIZEOF(a) (sizeof(a) / sizeof(a[0])) + +/* ========================================================================= */ + + +/* The list of fatal signals. + These are those signals whose default action is to terminate the process + without a core dump, except + SIGKILL - because it cannot be caught, + SIGALRM SIGUSR1 SIGUSR2 SIGPOLL SIGIO SIGLOST - because applications + often use them for their own purpose, + SIGPROF SIGVTALRM - because they are used for profiling, + SIGSTKFLT - because it is more similar to SIGFPE, SIGSEGV, SIGBUS, + SIGSYS - because it is more similar to SIGABRT, SIGSEGV, + SIGPWR - because it of too special use, + SIGRTMIN...SIGRTMAX - because they are reserved for application use. + plus + SIGXCPU, SIGXFSZ - because they are quite similar to SIGTERM. */ + +static int fatal_signals[] = + { + /* ISO C 99 signals. */ +#ifdef SIGINT + SIGINT, +#endif +#ifdef SIGTERM + SIGTERM, +#endif + /* POSIX:2001 signals. */ +#ifdef SIGHUP + SIGHUP, +#endif +#ifdef SIGPIPE + SIGPIPE, +#endif + /* BSD signals. */ +#ifdef SIGXCPU + SIGXCPU, +#endif +#ifdef SIGXFSZ + SIGXFSZ, +#endif + /* Native Windows signals. */ +#ifdef SIGBREAK + SIGBREAK, +#endif + 0 + }; + +#define num_fatal_signals (SIZEOF (fatal_signals) - 1) + +/* Eliminate signals whose signal handler is SIG_IGN. */ + +static void +init_fatal_signals (void) +{ + static bool fatal_signals_initialized = false; + if (!fatal_signals_initialized) + { + size_t i; + + for (i = 0; i < num_fatal_signals; i++) + { + struct sigaction action; + + if (sigaction (fatal_signals[i], NULL, &action) >= 0 + && get_handler (&action) == SIG_IGN) + fatal_signals[i] = -1; + } + + fatal_signals_initialized = true; + } +} + + +/* ========================================================================= */ + + +typedef void (*action_t) (void); + +/* Type of an entry in the actions array. + The 'action' field is accessed from within the fatal_signal_handler(), + therefore we mark it as 'volatile'. */ +typedef struct +{ + volatile action_t action; +} +actions_entry_t; + +/* The registered cleanup actions. */ +static actions_entry_t static_actions[32]; +static actions_entry_t * volatile actions = static_actions; +static sig_atomic_t volatile actions_count = 0; +static size_t actions_allocated = SIZEOF (static_actions); + + +/* The saved signal handlers. + Size 32 would not be sufficient: On HP-UX, SIGXCPU = 33, SIGXFSZ = 34. */ +static struct sigaction saved_sigactions[64]; + + +/* Uninstall the handlers. */ +static void +uninstall_handlers (void) +{ + size_t i; + + for (i = 0; i < num_fatal_signals; i++) + if (fatal_signals[i] >= 0) + { + int sig = fatal_signals[i]; + if (saved_sigactions[sig].sa_handler == SIG_IGN) + saved_sigactions[sig].sa_handler = SIG_DFL; + sigaction (sig, &saved_sigactions[sig], NULL); + } +} + + +/* The signal handler. It gets called asynchronously. */ +static void +fatal_signal_handler (int sig) +{ + for (;;) + { + /* Get the last registered cleanup action, in a reentrant way. */ + action_t action; + size_t n = actions_count; + if (n == 0) + break; + n--; + actions_count = n; + action = actions[n].action; + /* Execute the action. */ + action (); + } + + /* Now execute the signal's default action. + If the signal being delivered was blocked, the re-raised signal would be + delivered when this handler returns. But the way we install this handler, + no signal is blocked, and the re-raised signal is delivered already + during raise(). */ + uninstall_handlers (); + raise (sig); +} + + +/* Install the handlers. */ +static void +install_handlers (void) +{ + size_t i; + struct sigaction action; + + action.sa_handler = &fatal_signal_handler; + /* If we get a fatal signal while executing fatal_signal_handler, enter + fatal_signal_handler recursively, since it is reentrant. Hence no + SA_RESETHAND. */ + action.sa_flags = SA_NODEFER; + sigemptyset (&action.sa_mask); + for (i = 0; i < num_fatal_signals; i++) + if (fatal_signals[i] >= 0) + { + int sig = fatal_signals[i]; + + if (!(sig < sizeof (saved_sigactions) / sizeof (saved_sigactions[0]))) + abort (); + sigaction (sig, &action, &saved_sigactions[sig]); + } +} + + +/* Register a cleanup function to be executed when a catchable fatal signal + occurs. */ +void +at_fatal_signal (action_t action) +{ + static bool cleanup_initialized = false; + if (!cleanup_initialized) + { + init_fatal_signals (); + install_handlers (); + cleanup_initialized = true; + } + + if (actions_count == actions_allocated) + { + /* Extend the actions array. Note that we cannot use xrealloc(), + because then the cleanup() function could access an already + deallocated array. */ + actions_entry_t *old_actions = actions; + size_t old_actions_allocated = actions_allocated; + size_t new_actions_allocated = 2 * actions_allocated; + actions_entry_t *new_actions = + XNMALLOC (new_actions_allocated, actions_entry_t); + size_t k; + + /* Don't use memcpy() here, because memcpy takes non-volatile arguments + and is therefore not guaranteed to complete all memory stores before + the next statement. */ + for (k = 0; k < old_actions_allocated; k++) + new_actions[k] = old_actions[k]; + actions = new_actions; + actions_allocated = new_actions_allocated; + /* Now we can free the old actions array. */ + if (old_actions != static_actions) + free (old_actions); + } + /* The two uses of 'volatile' in the types above (and ISO C 99 section + 5.1.2.3.(5)) ensure that we increment the actions_count only after + the new action has been written to the memory location + actions[actions_count]. */ + actions[actions_count].action = action; + actions_count++; +} + + +/* ========================================================================= */ + + +static sigset_t fatal_signal_set; + +static void +init_fatal_signal_set (void) +{ + static bool fatal_signal_set_initialized = false; + if (!fatal_signal_set_initialized) + { + size_t i; + + init_fatal_signals (); + + sigemptyset (&fatal_signal_set); + for (i = 0; i < num_fatal_signals; i++) + if (fatal_signals[i] >= 0) + sigaddset (&fatal_signal_set, fatal_signals[i]); + + fatal_signal_set_initialized = true; + } +} + +/* Temporarily delay the catchable fatal signals. */ +void +block_fatal_signals (void) +{ + init_fatal_signal_set (); + sigprocmask (SIG_BLOCK, &fatal_signal_set, NULL); +} + +/* Stop delaying the catchable fatal signals. */ +void +unblock_fatal_signals (void) +{ + init_fatal_signal_set (); + sigprocmask (SIG_UNBLOCK, &fatal_signal_set, NULL); +} diff -up patch-2.7.6/lib/fatal-signal.h.switch-from-fork-execlp-to-execute patch-2.7.6/lib/fatal-signal.h --- patch-2.7.6/lib/fatal-signal.h.switch-from-fork-execlp-to-execute 2019-07-29 14:51:09.977920729 +0200 +++ patch-2.7.6/lib/fatal-signal.h 2019-07-29 14:51:09.977920729 +0200 @@ -0,0 +1,76 @@ +/* Emergency actions in case of a fatal signal. + Copyright (C) 2003-2004, 2009-2018 Free Software Foundation, Inc. + Written by Bruno Haible <bruno@clisp.org>, 2003. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. */ + + +#ifdef __cplusplus +extern "C" { +#endif + + +/* It is often useful to do some cleanup action when a usually fatal signal + terminates the process, like removing a temporary file or killing a + subprocess that may be stuck waiting for a device, pipe or network input. + Such signals are SIGHUP, SIGINT, SIGPIPE, SIGTERM, and possibly others. + The limitation of this facility is that it cannot work for SIGKILL. + + Signals with a SIG_IGN handler are considered to be non-fatal. The + functions in this file assume that when a SIG_IGN handler is installed + for a signal, it was installed before any functions in this file were + called and it stays so for the whole lifetime of the process. */ + +/* Register a cleanup function to be executed when a catchable fatal signal + occurs. + + Restrictions for the cleanup function: + - The cleanup function can do all kinds of system calls. + - It can also access application dependent memory locations and data + structures provided they are in a consistent state. One way to ensure + this is through block_fatal_signals()/unblock_fatal_signals(), see + below. Another - more tricky - way to ensure this is the careful use + of 'volatile'. + However, + - malloc() and similarly complex facilities are not safe to be called + because they are not guaranteed to be in a consistent state. + - Also, the cleanup function must not block the catchable fatal signals + and leave them blocked upon return. + + The cleanup function is executed asynchronously. It is unspecified + whether during its execution the catchable fatal signals are blocked + or not. */ +extern void at_fatal_signal (void (*function) (void)); + + +/* Sometimes it is necessary to block the usually fatal signals while the + data structures being accessed by the cleanup action are being built or + reorganized. This is the case, for example, when a temporary file or + directory is created through mkstemp() or mkdtemp(), because these + functions create the temporary file or directory _before_ returning its + name to the application. */ + +/* Temporarily delay the catchable fatal signals. + The signals will be blocked (= delayed) until the next call to + unblock_fatal_signals(). If the signals are already blocked, a further + call to block_fatal_signals() has no effect. */ +extern void block_fatal_signals (void); + +/* Stop delaying the catchable fatal signals. */ +extern void unblock_fatal_signals (void); + + +#ifdef __cplusplus +} +#endif diff -up patch-2.7.6/lib/gnulib.mk.switch-from-fork-execlp-to-execute patch-2.7.6/lib/gnulib.mk --- patch-2.7.6/lib/gnulib.mk.switch-from-fork-execlp-to-execute 2018-02-03 14:31:15.000000000 +0100 +++ patch-2.7.6/lib/gnulib.mk 2019-07-29 14:49:33.437536285 +0200 @@ -21,7 +21,7 @@ # the same distribution terms as the rest of that program. # # Generated by gnulib-tool. -# Reproduce by: gnulib-tool --import --local-dir=gl --lib=libpatch --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --makefile-name=gnulib.mk --no-conditional-dependencies --no-libtool --macro-prefix=gl argmatch backupfile clock-time diffseq dirname dup2 errno exitfail extensions faccessat fchmodat fchownat fcntl-h fstatat full-write getdate getopt-gnu gettime git-version-gen gitlog-to-changelog gnupload hash ignore-value intprops largefile linked-list maintainer-makefile malloc manywarnings memchr minmax mkdirat nstrftime openat progname quotearg readlinkat realloc renameat setenv signal size_max ssize_t stat-time stdbool stdlib symlinkat sys_stat tempname time unistd unlinkat update-copyright utimensat verror xalloc xlist xmemdup0 +# Reproduce by: gnulib-tool --import --local-dir=gl --lib=libpatch --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --makefile-name=gnulib.mk --no-conditional-dependencies --no-libtool --macro-prefix=gl argmatch backupfile clock-time diffseq dirname dup2 errno execute exitfail extensions faccessat fchmodat fchownat fcntl-h fstatat full-write getdate getopt-gnu gettime git-version-gen gitlog-to-changelog gnupload hash ignore-value intprops largefile linked-list maintainer-makefile malloc manywarnings memchr minmax mkdirat nstrftime openat progname quotearg readlinkat realloc renameat setenv signal size_max ssize_t stat-time stdbool stdlib symlinkat sys_stat tempname time unistd unlinkat update-copyright utimensat verror xalloc xlist xmemdup0 wait-process fatal-signal MOSTLYCLEANFILES += core *.stackdump @@ -378,6 +378,12 @@ EXTRA_libpatch_a_SOURCES += euidaccess.c ## end gnulib module euidaccess +## begin gnulib module execute + +libpatch_a_SOURCES += execute.h execute.c w32spawn.h + +## end gnulib module execute + ## begin gnulib module exitfail libpatch_a_SOURCES += exitfail.c @@ -2481,6 +2487,28 @@ libpatch_a_SOURCES += verror.h verror.c ## end gnulib module verror +## begin gnulib module wait-process + +libpatch_a_SOURCES += wait-process.h wait-process.c + +## end gnulib module wait-process + +## begin gnulib module fatal-signal + +libpatch_a_SOURCES += fatal-signal.h fatal-signal.c + +## end gnulib module fatal-signal + +## begin gnulib module sigaction + +libpatch_a_SOURCES += sig-handler.c + +EXTRA_DIST += sig-handler.h sigaction.c + +EXTRA_libpatch_a_SOURCES += sigaction.c + +## end gnulib module sigaction + ## begin gnulib module wchar BUILT_SOURCES += wchar.h @@ -2694,6 +2722,7 @@ EXTRA_libpatch_a_SOURCES += xmemdup0.c ## end gnulib module xmemdup0 + ## begin gnulib module xsize libpatch_a_SOURCES += xsize.h xsize.c diff -up patch-2.7.6/lib/sigaction.c.switch-from-fork-execlp-to-execute patch-2.7.6/lib/sigaction.c --- patch-2.7.6/lib/sigaction.c.switch-from-fork-execlp-to-execute 2019-07-29 14:50:31.833768833 +0200 +++ patch-2.7.6/lib/sigaction.c 2019-07-29 14:50:31.833768833 +0200 @@ -0,0 +1,204 @@ +/* POSIX compatible signal blocking. + Copyright (C) 2008-2018 Free Software Foundation, Inc. + Written by Eric Blake <ebb9@byu.net>, 2008. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. */ + +#include <config.h> + +/* Specification. */ +#include <signal.h> + +#include <errno.h> +#include <stdint.h> +#include <stdlib.h> + +/* This implementation of sigaction is tailored to native Windows behavior: + signal() has SysV semantics (ie. the handler is uninstalled before + it is invoked). This is an inherent data race if an asynchronous + signal is sent twice in a row before we can reinstall our handler, + but there's nothing we can do about it. Meanwhile, sigprocmask() + is not present, and while we can use the gnulib replacement to + provide critical sections, it too suffers from potential data races + in the face of an ill-timed asynchronous signal. And we compound + the situation by reading static storage in a signal handler, which + POSIX warns is not generically async-signal-safe. Oh well. + + Additionally: + - We don't implement SA_NOCLDSTOP or SA_NOCLDWAIT, because SIGCHLD + is not defined. + - We don't implement SA_ONSTACK, because sigaltstack() is not present. + - We ignore SA_RESTART, because blocking native Windows API calls are + not interrupted anyway when an asynchronous signal occurs, and the + MSVCRT runtime never sets errno to EINTR. + - We don't implement SA_SIGINFO because it is impossible to do so + portably. + + POSIX states that an application should not mix signal() and + sigaction(). We support the use of signal() within the gnulib + sigprocmask() substitute, but all other application code linked + with this module should stick with only sigaction(). */ + +/* Check some of our assumptions. */ +#if defined SIGCHLD || defined HAVE_SIGALTSTACK || defined HAVE_SIGINTERRUPT +# error "Revisit the assumptions made in the sigaction module" +#endif + +/* Out-of-range substitutes make a good fallback for uncatchable + signals. */ +#ifndef SIGKILL +# define SIGKILL (-1) +#endif +#ifndef SIGSTOP +# define SIGSTOP (-1) +#endif + +/* On native Windows, as of 2008, the signal SIGABRT_COMPAT is an alias + for the signal SIGABRT. Only one signal handler is stored for both + SIGABRT and SIGABRT_COMPAT. SIGABRT_COMPAT is not a signal of its own. */ +#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ +# undef SIGABRT_COMPAT +# define SIGABRT_COMPAT 6 +#endif + +/* A signal handler. */ +typedef void (*handler_t) (int signal); + +/* Set of current actions. If sa_handler for an entry is NULL, then + that signal is not currently handled by the sigaction handler. */ +static struct sigaction volatile action_array[NSIG] /* = 0 */; + +/* Signal handler that is installed for signals. */ +static void +sigaction_handler (int sig) +{ + handler_t handler; + sigset_t mask; + sigset_t oldmask; + int saved_errno = errno; + if (sig < 0 || NSIG <= sig || !action_array[sig].sa_handler) + { + /* Unexpected situation; be careful to avoid recursive abort. */ + if (sig == SIGABRT) + signal (SIGABRT, SIG_DFL); + abort (); + } + + /* Reinstall the signal handler when required; otherwise update the + bookkeeping so that the user's handler may call sigaction and get + accurate results. We know the signal isn't currently blocked, or + we wouldn't be in its handler, therefore we know that we are not + interrupting a sigaction() call. There is a race where any + asynchronous instance of the same signal occurring before we + reinstall the handler will trigger the default handler; oh + well. */ + handler = action_array[sig].sa_handler; + if ((action_array[sig].sa_flags & SA_RESETHAND) == 0) + signal (sig, sigaction_handler); + else + action_array[sig].sa_handler = NULL; + + /* Block appropriate signals. */ + mask = action_array[sig].sa_mask; + if ((action_array[sig].sa_flags & SA_NODEFER) == 0) + sigaddset (&mask, sig); + sigprocmask (SIG_BLOCK, &mask, &oldmask); + + /* Invoke the user's handler, then restore prior mask. */ + errno = saved_errno; + handler (sig); + saved_errno = errno; + sigprocmask (SIG_SETMASK, &oldmask, NULL); + errno = saved_errno; +} + +/* Change and/or query the action that will be taken on delivery of + signal SIG. If not NULL, ACT describes the new behavior. If not + NULL, OACT is set to the prior behavior. Return 0 on success, or + set errno and return -1 on failure. */ +int +sigaction (int sig, const struct sigaction *restrict act, + struct sigaction *restrict oact) +{ + sigset_t mask; + sigset_t oldmask; + int saved_errno; + + if (sig < 0 || NSIG <= sig || sig == SIGKILL || sig == SIGSTOP + || (act && act->sa_handler == SIG_ERR)) + { + errno = EINVAL; + return -1; + } + +#ifdef SIGABRT_COMPAT + if (sig == SIGABRT_COMPAT) + sig = SIGABRT; +#endif + + /* POSIX requires sigaction() to be async-signal-safe. In other + words, if an asynchronous signal can occur while we are anywhere + inside this function, the user's handler could then call + sigaction() recursively and expect consistent results. We meet + this rule by using sigprocmask to block all signals before + modifying any data structure that could be read from a signal + handler; this works since we know that the gnulib sigprocmask + replacement does not try to use sigaction() from its handler. */ + if (!act && !oact) + return 0; + sigfillset (&mask); + sigprocmask (SIG_BLOCK, &mask, &oldmask); + if (oact) + { + if (action_array[sig].sa_handler) + *oact = action_array[sig]; + else + { + /* Safe to change the handler at will here, since all + signals are currently blocked. */ + oact->sa_handler = signal (sig, SIG_DFL); + if (oact->sa_handler == SIG_ERR) + goto failure; + signal (sig, oact->sa_handler); + oact->sa_flags = SA_RESETHAND | SA_NODEFER; + sigemptyset (&oact->sa_mask); + } + } + + if (act) + { + /* Safe to install the handler before updating action_array, + since all signals are currently blocked. */ + if (act->sa_handler == SIG_DFL || act->sa_handler == SIG_IGN) + { + if (signal (sig, act->sa_handler) == SIG_ERR) + goto failure; + action_array[sig].sa_handler = NULL; + } + else + { + if (signal (sig, sigaction_handler) == SIG_ERR) + goto failure; + action_array[sig] = *act; + } + } + sigprocmask (SIG_SETMASK, &oldmask, NULL); + return 0; + + failure: + saved_errno = errno; + sigprocmask (SIG_SETMASK, &oldmask, NULL); + errno = saved_errno; + return -1; +} diff -up patch-2.7.6/lib/sig-handler.c.switch-from-fork-execlp-to-execute patch-2.7.6/lib/sig-handler.c --- patch-2.7.6/lib/sig-handler.c.switch-from-fork-execlp-to-execute 2019-07-29 14:50:17.265710820 +0200 +++ patch-2.7.6/lib/sig-handler.c 2019-07-29 14:48:19.707242671 +0200 @@ -0,0 +1,3 @@ +#include <config.h> +#define SIG_HANDLER_INLINE _GL_EXTERN_INLINE +#include "sig-handler.h" diff -up patch-2.7.6/lib/sig-handler.h.switch-from-fork-execlp-to-execute patch-2.7.6/lib/sig-handler.h --- patch-2.7.6/lib/sig-handler.h.switch-from-fork-execlp-to-execute 2019-07-29 14:50:12.249690845 +0200 +++ patch-2.7.6/lib/sig-handler.h 2019-07-29 14:48:23.099256180 +0200 @@ -0,0 +1,54 @@ +/* Convenience declarations when working with <signal.h>. + + Copyright (C) 2008-2018 Free Software Foundation, Inc. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. */ + +#ifndef _GL_SIG_HANDLER_H +#define _GL_SIG_HANDLER_H + +#include <signal.h> + +#ifndef _GL_INLINE_HEADER_BEGIN + #error "Please include config.h first." +#endif +_GL_INLINE_HEADER_BEGIN +#ifndef SIG_HANDLER_INLINE +# define SIG_HANDLER_INLINE _GL_INLINE +#endif + +/* Convenience type when working with signal handlers. */ +typedef void (*sa_handler_t) (int); + +/* Return the handler of a signal, as a sa_handler_t value regardless + of its true type. The resulting function can be compared to + special values like SIG_IGN but it is not portable to call it. */ +SIG_HANDLER_INLINE sa_handler_t _GL_ATTRIBUTE_PURE +get_handler (struct sigaction const *a) +{ +#ifdef SA_SIGINFO + /* POSIX says that special values like SIG_IGN can only occur when + action.sa_flags does not contain SA_SIGINFO. But in Linux 2.4, + for example, sa_sigaction and sa_handler are aliases and a signal + is ignored if sa_sigaction (after casting) equals SIG_IGN. So + use (and cast) sa_sigaction in that case. */ + if (a->sa_flags & SA_SIGINFO) + return (sa_handler_t) a->sa_sigaction; +#endif + return a->sa_handler; +} + +_GL_INLINE_HEADER_END + +#endif /* _GL_SIG_HANDLER_H */ diff -up patch-2.7.6/lib/w32spawn.h.switch-from-fork-execlp-to-execute patch-2.7.6/lib/w32spawn.h --- patch-2.7.6/lib/w32spawn.h.switch-from-fork-execlp-to-execute 2019-07-29 14:40:53.265464828 +0200 +++ patch-2.7.6/lib/w32spawn.h 2019-07-29 14:40:53.265464828 +0200 @@ -0,0 +1,233 @@ +/* Auxiliary functions for the creation of subprocesses. Native Windows API. + Copyright (C) 2001, 2003-2018 Free Software Foundation, Inc. + Written by Bruno Haible <bruno@clisp.org>, 2003. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. */ + +#ifndef __KLIBC__ +/* Get declarations of the native Windows API functions. */ +# define WIN32_LEAN_AND_MEAN +# include <windows.h> +#endif + +/* Get _open_osfhandle(). */ +#include <io.h> + +#include <stdbool.h> +#include <string.h> +#include <unistd.h> +#include <errno.h> + +/* Get _get_osfhandle(). */ +# if GNULIB_MSVC_NOTHROW +# include "msvc-nothrow.h" +# else +# include <io.h> +# endif + +#include "cloexec.h" +#include "xalloc.h" + +/* Duplicates a file handle, making the copy uninheritable. + Returns -1 for a file handle that is equivalent to closed. */ +static int +dup_noinherit (int fd) +{ + fd = dup_cloexec (fd); + if (fd < 0 && errno == EMFILE) + error (EXIT_FAILURE, errno, _("_open_osfhandle failed")); + + return fd; +} + +/* Returns a file descriptor equivalent to FD, except that the resulting file + descriptor is none of STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO. + FD must be open and non-inheritable. The result will be non-inheritable as + well. + If FD < 0, FD itself is returned. */ +static int +fd_safer_noinherit (int fd) +{ + if (STDIN_FILENO <= fd && fd <= STDERR_FILENO) + { + /* The recursion depth is at most 3. */ + int nfd = fd_safer_noinherit (dup_noinherit (fd)); + int saved_errno = errno; + close (fd); + errno = saved_errno; + return nfd; + } + return fd; +} + +/* Duplicates a file handle, making the copy uninheritable and ensuring the + result is none of STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO. + Returns -1 for a file handle that is equivalent to closed. */ +static int +dup_safer_noinherit (int fd) +{ + return fd_safer_noinherit (dup_noinherit (fd)); +} + +/* Undoes the effect of TEMPFD = dup_safer_noinherit (ORIGFD); */ +static void +undup_safer_noinherit (int tempfd, int origfd) +{ + if (tempfd >= 0) + { + if (dup2 (tempfd, origfd) < 0) + error (EXIT_FAILURE, errno, _("cannot restore fd %d: dup2 failed"), + origfd); + close (tempfd); + } + else + { + /* origfd was closed or open to no handle at all. Set it to a closed + state. This is (nearly) equivalent to the original state. */ + close (origfd); + } +} + +/* Prepares an argument vector before calling spawn(). + Note that spawn() does not by itself call the command interpreter + (getenv ("COMSPEC") != NULL ? getenv ("COMSPEC") : + ({ OSVERSIONINFO v; v.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); + GetVersionEx(&v); + v.dwPlatformId == VER_PLATFORM_WIN32_NT; + }) ? "cmd.exe" : "command.com"). + Instead it simply concatenates the arguments, separated by ' ', and calls + CreateProcess(). We must quote the arguments since Windows CreateProcess() + interprets characters like ' ', '\t', '\\', '"' (but not '<' and '>') in a + special way: + - Space and tab are interpreted as delimiters. They are not treated as + delimiters if they are surrounded by double quotes: "...". + - Unescaped double quotes are removed from the input. Their only effect is + that within double quotes, space and tab are treated like normal + characters. + - Backslashes not followed by double quotes are not special. + - But 2*n+1 backslashes followed by a double quote become + n backslashes followed by a double quote (n >= 0): + \" -> " + \\\" -> \" + \\\\\" -> \\" + - '*', '?' characters may get expanded through wildcard expansion in the + callee: By default, in the callee, the initialization code before main() + takes the result of GetCommandLine(), wildcard-expands it, and passes it + to main(). The exceptions to this rule are: + - programs that inspect GetCommandLine() and ignore argv, + - mingw programs that have a global variable 'int _CRT_glob = 0;', + - Cygwin programs, when invoked from a Cygwin program. + */ +#ifndef __KLIBC__ +# define SHELL_SPECIAL_CHARS "\"\\ \001\002\003\004\005\006\007\010\011\012\013\014\015\016\017\020\021\022\023\024\025\026\027\030\031\032\033\034\035\036\037*?" +# define SHELL_SPACE_CHARS " \001\002\003\004\005\006\007\010\011\012\013\014\015\016\017\020\021\022\023\024\025\026\027\030\031\032\033\034\035\036\037" +#else +# define SHELL_SPECIAL_CHARS "" +# define SHELL_SPACE_CHARS "" +#endif +static char ** +prepare_spawn (char **argv) +{ + size_t argc; + char **new_argv; + size_t i; + + /* Count number of arguments. */ + for (argc = 0; argv[argc] != NULL; argc++) + ; + + /* Allocate new argument vector. */ + new_argv = XNMALLOC (1 + argc + 1, char *); + + /* Add an element upfront that can be used when argv[0] turns out to be a + script, not a program. + On Unix, this would be "/bin/sh". On native Windows, "sh" is actually + "sh.exe". We have to omit the directory part and rely on the search in + PATH, because the mingw "mount points" are not visible inside Windows + CreateProcess(). */ + *new_argv++ = "sh.exe"; + + /* Put quoted arguments into the new argument vector. */ + for (i = 0; i < argc; i++) + { + const char *string = argv[i]; + + if (string[0] == '\0') + new_argv[i] = xstrdup ("\"\""); + else if (strpbrk (string, SHELL_SPECIAL_CHARS) != NULL) + { + bool quote_around = (strpbrk (string, SHELL_SPACE_CHARS) != NULL); + size_t length; + unsigned int backslashes; + const char *s; + char *quoted_string; + char *p; + + length = 0; + backslashes = 0; + if (quote_around) + length++; + for (s = string; *s != '\0'; s++) + { + char c = *s; + if (c == '"') + length += backslashes + 1; + length++; + if (c == '\\') + backslashes++; + else + backslashes = 0; + } + if (quote_around) + length += backslashes + 1; + + quoted_string = (char *) xmalloc (length + 1); + + p = quoted_string; + backslashes = 0; + if (quote_around) + *p++ = '"'; + for (s = string; *s != '\0'; s++) + { + char c = *s; + if (c == '"') + { + unsigned int j; + for (j = backslashes + 1; j > 0; j--) + *p++ = '\\'; + } + *p++ = c; + if (c == '\\') + backslashes++; + else + backslashes = 0; + } + if (quote_around) + { + unsigned int j; + for (j = backslashes; j > 0; j--) + *p++ = '\\'; + *p++ = '"'; + } + *p = '\0'; + + new_argv[i] = quoted_string; + } + else + new_argv[i] = (char *) string; + } + new_argv[argc] = NULL; + + return new_argv; +} diff -up patch-2.7.6/lib/wait-process.c.switch-from-fork-execlp-to-execute patch-2.7.6/lib/wait-process.c --- patch-2.7.6/lib/wait-process.c.switch-from-fork-execlp-to-execute 2019-07-29 14:50:49.937840928 +0200 +++ patch-2.7.6/lib/wait-process.c 2019-07-29 14:45:17.196515863 +0200 @@ -0,0 +1,361 @@ +/* Waiting for a subprocess to finish. + Copyright (C) 2001-2003, 2005-2018 Free Software Foundation, Inc. + Written by Bruno Haible <haible@clisp.cons.org>, 2001. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. */ + + +#include <config.h> + +/* Specification. */ +#include "wait-process.h" + +#include <errno.h> +#include <stdlib.h> +#include <string.h> +#include <signal.h> + +#include <sys/types.h> +#include <sys/wait.h> + +#include "error.h" +#include "fatal-signal.h" +#include "xalloc.h" +#include "gettext.h" + +#define _(str) gettext (str) + +#define SIZEOF(a) (sizeof(a) / sizeof(a[0])) + + +#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ + +# define WIN32_LEAN_AND_MEAN +# include <windows.h> + +/* The return value of spawnvp() is really a process handle as returned + by CreateProcess(). Therefore we can kill it using TerminateProcess. */ +# define kill(pid,sig) TerminateProcess ((HANDLE) (pid), sig) + +#endif + + +/* Type of an entry in the slaves array. + The 'used' bit determines whether this entry is currently in use. + (If pid_t was an atomic type like sig_atomic_t, we could just set the + 'child' field to 0 when unregistering a slave process, and wouldn't need + the 'used' field.) + The 'used' and 'child' fields are accessed from within the cleanup_slaves() + action, therefore we mark them as 'volatile'. */ +typedef struct +{ + volatile sig_atomic_t used; + volatile pid_t child; +} +slaves_entry_t; + +/* The registered slave subprocesses. */ +static slaves_entry_t static_slaves[32]; +static slaves_entry_t * volatile slaves = static_slaves; +static sig_atomic_t volatile slaves_count = 0; +static size_t slaves_allocated = SIZEOF (static_slaves); + +/* The termination signal for slave subprocesses. + 2003-10-07: Terminator becomes Governator. */ +#ifdef SIGHUP +# define TERMINATOR SIGHUP +#else +# define TERMINATOR SIGTERM +#endif + +/* The cleanup action. It gets called asynchronously. */ +static void +cleanup_slaves (void) +{ + for (;;) + { + /* Get the last registered slave. */ + size_t n = slaves_count; + if (n == 0) + break; + n--; + slaves_count = n; + /* Skip unused entries in the slaves array. */ + if (slaves[n].used) + { + pid_t slave = slaves[n].child; + + /* Kill the slave. */ + kill (slave, TERMINATOR); + } + } +} + +/* Register a subprocess as being a slave process. This means that the + subprocess will be terminated when its creator receives a catchable fatal + signal or exits normally. Registration ends when wait_subprocess() + notices that the subprocess has exited. */ +void +register_slave_subprocess (pid_t child) +{ + static bool cleanup_slaves_registered = false; + if (!cleanup_slaves_registered) + { + atexit (cleanup_slaves); + at_fatal_signal (cleanup_slaves); + cleanup_slaves_registered = true; + } + + /* Try to store the new slave in an unused entry of the slaves array. */ + { + slaves_entry_t *s = slaves; + slaves_entry_t *s_end = s + slaves_count; + + for (; s < s_end; s++) + if (!s->used) + { + /* The two uses of 'volatile' in the slaves_entry_t type above + (and ISO C 99 section 5.1.2.3.(5)) ensure that we mark the + entry as used only after the child pid has been written to the + memory location s->child. */ + s->child = child; + s->used = 1; + return; + } + } + + if (slaves_count == slaves_allocated) + { + /* Extend the slaves array. Note that we cannot use xrealloc(), + because then the cleanup_slaves() function could access an already + deallocated array. */ + slaves_entry_t *old_slaves = slaves; + size_t new_slaves_allocated = 2 * slaves_allocated; + slaves_entry_t *new_slaves = + (slaves_entry_t *) + malloc (new_slaves_allocated * sizeof (slaves_entry_t)); + if (new_slaves == NULL) + { + /* xalloc_die() will call exit() which will invoke cleanup_slaves(). + Additionally we need to kill child, because it's not yet among + the slaves list. */ + kill (child, TERMINATOR); + xalloc_die (); + } + memcpy (new_slaves, old_slaves, + slaves_allocated * sizeof (slaves_entry_t)); + slaves = new_slaves; + slaves_allocated = new_slaves_allocated; + /* Now we can free the old slaves array. */ + if (old_slaves != static_slaves) + free (old_slaves); + } + /* The three uses of 'volatile' in the types above (and ISO C 99 section + 5.1.2.3.(5)) ensure that we increment the slaves_count only after the + new slave and its 'used' bit have been written to the memory locations + that make up slaves[slaves_count]. */ + slaves[slaves_count].child = child; + slaves[slaves_count].used = 1; + slaves_count++; +} + +/* Unregister a child from the list of slave subprocesses. */ +static void +unregister_slave_subprocess (pid_t child) +{ + /* The easiest way to remove an entry from a list that can be used by + an asynchronous signal handler is just to mark it as unused. For this, + we rely on sig_atomic_t. */ + slaves_entry_t *s = slaves; + slaves_entry_t *s_end = s + slaves_count; + + for (; s < s_end; s++) + if (s->used && s->child == child) + s->used = 0; +} + + +/* Wait for a subprocess to finish. Return its exit code. + If it didn't terminate correctly, exit if exit_on_error is true, otherwise + return 127. */ +int +wait_subprocess (pid_t child, const char *progname, + bool ignore_sigpipe, bool null_stderr, + bool slave_process, bool exit_on_error, + int *termsigp) +{ +#if HAVE_WAITID && defined WNOWAIT && 0 + /* Commented out because waitid() without WEXITED and with WNOWAIT doesn't + work: On Solaris 7 and OSF/1 4.0, it returns -1 and sets errno = ECHILD, + and on HP-UX 10.20 it just hangs. */ + /* Use of waitid() with WNOWAIT avoids a race condition: If slave_process is + true, and this process sleeps a very long time between the return from + waitpid() and the execution of unregister_slave_subprocess(), and + meanwhile another process acquires the same PID as child, and then - still + before unregister_slave_subprocess() - this process gets a fatal signal, + it would kill the other totally unrelated process. */ + siginfo_t info; + + if (termsigp != NULL) + *termsigp = 0; + for (;;) + { + if (waitid (P_PID, child, &info, WEXITED | (slave_process ? WNOWAIT : 0)) + < 0) + { +# ifdef EINTR + if (errno == EINTR) + continue; +# endif + if (exit_on_error || !null_stderr) + error (exit_on_error ? EXIT_FAILURE : 0, errno, + _("%s subprocess"), progname); + return 127; + } + + /* info.si_code is set to one of CLD_EXITED, CLD_KILLED, CLD_DUMPED, + CLD_TRAPPED, CLD_STOPPED, CLD_CONTINUED. Loop until the program + terminates. */ + if (info.si_code == CLD_EXITED + || info.si_code == CLD_KILLED || info.si_code == CLD_DUMPED) + break; + } + + /* The child process has exited or was signalled. */ + + if (slave_process) + { + /* Unregister the child from the list of slave subprocesses, so that + later, when we exit, we don't kill a totally unrelated process which + may have acquired the same pid. */ + unregister_slave_subprocess (child); + + /* Now remove the zombie from the process list. */ + for (;;) + { + if (waitid (P_PID, child, &info, WEXITED) < 0) + { +# ifdef EINTR + if (errno == EINTR) + continue; +# endif + if (exit_on_error || !null_stderr) + error (exit_on_error ? EXIT_FAILURE : 0, errno, + _("%s subprocess"), progname); + return 127; + } + break; + } + } + + switch (info.si_code) + { + case CLD_KILLED: + case CLD_DUMPED: + if (termsigp != NULL) + *termsigp = info.si_status; /* TODO: or info.si_signo? */ +# ifdef SIGPIPE + if (info.si_status == SIGPIPE && ignore_sigpipe) + return 0; +# endif + if (exit_on_error || (!null_stderr && termsigp == NULL)) + error (exit_on_error ? EXIT_FAILURE : 0, 0, + _("%s subprocess got fatal signal %d"), + progname, info.si_status); + return 127; + case CLD_EXITED: + if (info.si_status == 127) + { + if (exit_on_error || !null_stderr) + error (exit_on_error ? EXIT_FAILURE : 0, 0, + _("%s subprocess failed"), progname); + return 127; + } + return info.si_status; + default: + abort (); + } +#else + /* waitpid() is just as portable as wait() nowadays. */ + int status; + + if (termsigp != NULL) + *termsigp = 0; + status = 0; + for (;;) + { + int result = waitpid (child, &status, 0); + + if (result != child) + { +# ifdef EINTR + if (errno == EINTR) + continue; +# endif +# if 0 /* defined ECHILD */ + if (errno == ECHILD) + { + /* Child process nonexistent?! Assume it terminated + successfully. */ + status = 0; + break; + } +# endif + if (exit_on_error || !null_stderr) + error (exit_on_error ? EXIT_FAILURE : 0, errno, + _("%s subprocess"), progname); + return 127; + } + + /* One of WIFSIGNALED (status), WIFEXITED (status), WIFSTOPPED (status) + must always be true, since we did not specify WCONTINUED in the + waitpid() call. Loop until the program terminates. */ + if (!WIFSTOPPED (status)) + break; + } + + /* The child process has exited or was signalled. */ + + if (slave_process) + /* Unregister the child from the list of slave subprocesses, so that + later, when we exit, we don't kill a totally unrelated process which + may have acquired the same pid. */ + unregister_slave_subprocess (child); + + if (WIFSIGNALED (status)) + { + if (termsigp != NULL) + *termsigp = WTERMSIG (status); +# ifdef SIGPIPE + if (WTERMSIG (status) == SIGPIPE && ignore_sigpipe) + return 0; +# endif + if (exit_on_error || (!null_stderr && termsigp == NULL)) + error (exit_on_error ? EXIT_FAILURE : 0, 0, + _("%s subprocess got fatal signal %d"), + progname, (int) WTERMSIG (status)); + return 127; + } + if (!WIFEXITED (status)) + abort (); + if (WEXITSTATUS (status) == 127) + { + if (exit_on_error || !null_stderr) + error (exit_on_error ? EXIT_FAILURE : 0, 0, + _("%s subprocess failed"), progname); + return 127; + } + return WEXITSTATUS (status); +#endif +} diff -up patch-2.7.6/lib/wait-process.h.switch-from-fork-execlp-to-execute patch-2.7.6/lib/wait-process.h --- patch-2.7.6/lib/wait-process.h.switch-from-fork-execlp-to-execute 2019-07-29 14:50:46.505827261 +0200 +++ patch-2.7.6/lib/wait-process.h 2019-07-29 14:45:20.715529876 +0200 @@ -0,0 +1,74 @@ +/* Waiting for a subprocess to finish. + Copyright (C) 2001-2003, 2006, 2008-2018 Free Software Foundation, Inc. + Written by Bruno Haible <haible@clisp.cons.org>, 2001. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. */ + +#ifndef _WAIT_PROCESS_H +#define _WAIT_PROCESS_H + +/* Get pid_t. */ +#include <stdlib.h> +#include <unistd.h> +#include <sys/types.h> + +#include <stdbool.h> + + +#ifdef __cplusplus +extern "C" { +#endif + + +/* Wait for a subprocess to finish. Return its exit code. + If it didn't terminate correctly, exit if exit_on_error is true, otherwise + return 127. + Arguments: + - child is the pid of the subprocess. + - progname is the name of the program executed by the subprocess, used for + error messages. + - If ignore_sigpipe is true, consider a subprocess termination due to + SIGPIPE as equivalent to a success. This is suitable for processes whose + only purpose is to write to standard output. This flag can be safely set + to false when the process' standard output is known to go to DEV_NULL. + - If null_stderr is true, the usual error message to stderr will be omitted. + This is suitable when the subprocess does not fulfill an important task. + - slave_process should be set to true if the process has been launched as a + slave process. + - If exit_on_error is true, any error will cause the main process to exit + with an error status. + - If termsigp is not NULL: *termsig will be set to the signal that + terminated the subprocess (if supported by the platform: not on native + Windows platforms), otherwise 0, and the error message about the signal + that terminated the subprocess will be omitted. + Prerequisites: The signal handler for SIGCHLD should not be set to SIG_IGN, + otherwise this function will not work. */ +extern int wait_subprocess (pid_t child, const char *progname, + bool ignore_sigpipe, bool null_stderr, + bool slave_process, bool exit_on_error, + int *termsigp); + +/* Register a subprocess as being a slave process. This means that the + subprocess will be terminated when its creator receives a catchable fatal + signal or exits normally. Registration ends when wait_subprocess() + notices that the subprocess has exited. */ +extern void register_slave_subprocess (pid_t child); + + +#ifdef __cplusplus +} +#endif + + +#endif /* _WAIT_PROCESS_H */ diff -up patch-2.7.6/src/pch.c.switch-from-fork-execlp-to-execute patch-2.7.6/src/pch.c --- patch-2.7.6/src/pch.c.switch-from-fork-execlp-to-execute 2019-07-29 14:40:53.262464816 +0200 +++ patch-2.7.6/src/pch.c 2019-07-29 15:01:10.338312098 +0200 @@ -33,7 +33,8 @@ # include <io.h> #endif #include <safe.h> -#include <sys/wait.h> +#include <alloca.h> +#include "execute.h" #define INITHUNKMAX 125 /* initial dynamic allocation size */ @@ -2453,6 +2463,9 @@ do_ed_script (char const *inname, char c if (! dry_run && ! skip_rest_of_patch) { int exclusive = *outname_needs_removal ? 0 : O_EXCL; + char const **ed_argv; + int stdin_dup, status; + *outname_needs_removal = true; if (inerrno != ENOENT) { @@ -2461,24 +2474,22 @@ do_ed_script (char const *inname, char c } fflush (stdout); - pid = fork(); - if (pid == -1) - pfatal ("Can't fork"); - else if (pid == 0) - { - dup2 (tmpfd, 0); - assert (outname[0] != '!' && outname[0] != '-'); - execlp (editor_program, editor_program, "-", outname, (char *) NULL); - _exit (2); - } - else - { - int wstatus; - if (waitpid (pid, &wstatus, 0) == -1 - || ! WIFEXITED (wstatus) - || WEXITSTATUS (wstatus) != 0) - fatal ("%s FAILED", editor_program); - } + if ((stdin_dup = dup (0)) == -1 + || dup2 (tmpfd, 0) == -1) + pfatal ("Failed to duplicate standard input"); + assert (outname[0] != '!' && outname[0] != '-'); + ed_argv = alloca (4 * sizeof * ed_argv); + ed_argv[0] = editor_program; + ed_argv[1] = "-"; + ed_argv[2] = outname; + ed_argv[3] = (char *) NULL; + status = execute (editor_program, editor_program, (char **)ed_argv, + false, false, false, false, true, false, NULL); + if (status) + fatal ("%s FAILED", editor_program); + if (dup2 (stdin_dup, 0) == -1 + || close (stdin_dup) == -1) + pfatal ("Failed to duplicate standard input"); } fclose (tmpfp);
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