File _service:tar_scm:backport-0002-posix-Add-npth_p... of Package npth

File _service:tar_scm:backport-0002-posix-Add-npth_poll-npth_ppoll.patch of Package npth

From b5ecd8d2c6fdb988f6139c5157c124ebea293bd7 Mon Sep 17 00:00:00 2001
From: NIIBE Yutaka <gniibe@fsij.org>
Date: Wed, 22 Dec 2021 09:52:44 +0900
Subject: [PATCH 1/2] posix: Add npth_poll/npth_ppoll.

* configure.ac: Add checks for poll.h and ppoll.

GnuPG-bug-id: 5748
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
Signed-off-by: EulerOSWander <314264452@qq.com>
---

configure.ac  |  6 ++---
 src/npth.c    | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/npth.h.in |  5 +++++
 3 files changed, 78 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index 3d76661..cf8bb0e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -18,7 +18,7 @@
 
 # Process this file with autoconf to produce a configure script.
 
-AC_PREREQ([2.67])
+AC_PREREQ([2.69])
 min_automake_version="1.14"
 
 # To build a release you need to create a tag with the version number
@@ -198,7 +198,7 @@ AC_DEFINE_UNQUOTED(BUILD_TIMESTAMP, "$BUILD_TIMESTAMP",
 #
 # fixme: For what do we need the sys/socket test?
 AC_CHECK_HEADERS([sys/socket.h sys/select.h unistd.h sys/time.h time.h \
-                  signal.h])
+                  signal.h poll.h])
 INSERT_SYS_SELECT_H=
 if test x"$ac_cv_header_sys_select_h" = xyes; then
   INSERT_SYS_SELECT_H="include <sys/select.h>"
@@ -277,7 +277,7 @@ if test "$have_w32_system" = no; then
   fi
 fi
 
-AC_CHECK_FUNCS([select pselect gettimeofday])
+AC_CHECK_FUNCS([select pselect gettimeofday ppoll])
 
 npth_LIBSOCKET
 config_libs="$config_libs $LIBSOCKET"
diff --git a/src/npth.c b/src/npth.c
index 45ca7ee..22314a6 100644
--- a/src/npth.c
+++ b/src/npth.c
@@ -71,6 +71,9 @@ sem_wait (sem_t *sem)
 #ifndef HAVE_PSELECT
 # include <signal.h>
 #endif
+#ifdef HAVE_POLL_H
+#include <poll.h>
+#endif
 
 #include "npth.h"
 
@@ -675,6 +678,73 @@ npth_pselect(int nfd, fd_set *rfds, fd_set *wfds, fd_set *efds,
 }
 
 
+int
+npth_poll (struct pollfd *fds, unsigned long nfds, int timeout)
+{
+  int res;
+
+  ENTER();
+#ifdef HAVE_POLL_H
+  res = poll (fds, (nfds_t)nfds, timeout);
+#endif
+  LEAVE();
+  return res;
+}
+
+
+int
+npth_ppoll (struct pollfd *fds, unsigned long nfds,
+            const struct timespec *timeout, const sigset_t *sigmask)
+{
+  int res;
+
+  ENTER();
+#ifdef HAVE_POLL_H
+#ifdef HAVE_PPOLL
+  res = ppoll (fds, (nfds_t)nfds, timeout, sigmask);
+#else /*!HAVE_PPOLL*/
+  {
+#   ifdef __GNUC__
+#     warning Using a non race free ppoll emulation.
+#   endif
+
+    int t;
+
+    if (!timeout)
+      t = -1;
+    else if (timeout->tv_nsec >= 0 && timeout->tv_nsec < 1000000000)
+      t = timeout->tv_sec * 1000 + (timeout->tv_nsec + 999999) / 1000000;
+    else
+      {
+        errno = EINVAL;
+        res = -1;
+        goto leave;
+      }
+
+    if (sigmask)
+      {
+        int save_errno;
+        sigset_t savemask;
+
+        pthread_sigmask (SIG_SETMASK, sigmask, &savemask);
+        res = poll (fds, (nfds_t)nfds, timeout);
+        save_errno = errno;
+        pthread_sigmask (SIG_SETMASK, &savemask, NULL);
+        errno = save_errno;
+      }
+    else
+      res = poll (fds, (nfds_t)nfds, timeout);
+
+  leave:
+    ;
+  }
+#endif
+#endif
+  LEAVE();
+  return res;
+}
+
+
 ssize_t
 npth_read(int fd, void *buf, size_t nbytes)
 {
diff --git a/src/npth.h.in b/src/npth.h.in
index 39dcf32..db57935 100644
--- a/src/npth.h.in
+++ b/src/npth.h.in
@@ -345,6 +345,11 @@ ssize_t npth_write(int fd, const void *buf, size_t nbytes);
 int npth_recvmsg (int fd, struct msghdr *msg, int flags);
 int npth_sendmsg (int fd, const struct msghdr *msg, int flags);
 
+struct pollfd;
+int npth_poll (struct pollfd *fds, unsigned long nfds, int timeout);
+int npth_ppoll (struct pollfd *fds, unsigned long nfds,
+                const struct timespec *timeout, const sigset_t *sigmask);
+
 /* For anything not covered here, you can enter/leave manually at your
    own risk.  */
 void npth_unprotect (void);
-- 
1.8.3.1