[PATCH] [SV 63307] Unignore SIGPIPE in spawned children

[Andreas Schwab]

* configure.ac: Check for posix_spawnattr_setsigdefault.
* src/job.c (child_execute_job): Set SIGPIPE to default in the
child process.
---
 configure.ac |  2 +-
 src/job.c    | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 9f688971..30eb2d55 100644
--- a/configure.ac
+++ b/configure.ac
@@ -134,7 +134,7 @@ AC_CHECK_FUNCS([strtoll strdup strndup stpcpy memrchr 
mempcpy umask mkstemp \
                 getgroups seteuid setegid setlinebuf setreuid setregid \
                 mkfifo getrlimit setrlimit setvbuf pipe strerror strsignal \
                 lstat readlink atexit isatty ttyname pselect posix_spawn \
-                posix_spawnattr_setsigmask])
+                posix_spawnattr_setsigmask posix_spawnattr_setsigdefault])
 
 # We need to check declarations, not just existence, because on Tru64 this
 # function is not declared without special flags, which themselves cause
diff --git a/src/job.c b/src/job.c
index b78f279c..621ff899 100644
--- a/src/job.c
+++ b/src/job.c
@@ -2305,6 +2305,11 @@ child_execute_job (struct childbase *child, int 
good_stdin, char **argv)
   /* We are the child.  */
   unblock_all_sigs ();
 
+  /* Unignore SIPIPE.  */
+#ifdef SIGPIPE
+  bsd_signal (SIGPIPE, SIG_DFL);
+#endif
+
 #ifdef SET_STACK_SIZE
   /* Reset limits, if necessary.  */
   if (stack_limit.rlim_cur)
@@ -2347,6 +2352,19 @@ child_execute_job (struct childbase *child, int 
good_stdin, char **argv)
   }
 #endif /* have posix_spawnattr_setsigmask() */
 
+  /* Unignore SIGPIPE.  */
+#ifdef HAVE_POSIX_SPAWNATTR_SETSIGDEFAULT
+  {
+    sigset_t mask;
+    sigemptyset (&mask);
+    sigaddset (&mask, SIGPIPE);
+    r = posix_spawnattr_setsigdefault (&attr, &mask);
+    if (r != 0)
+      goto cleanup;
+    flags |= POSIX_SPAWN_SETSIGDEF;
+  }
+#endif
+
   /* USEVFORK can give significant speedup on systems where it's available.  */
 #ifdef POSIX_SPAWN_USEVFORK
   flags |= POSIX_SPAWN_USEVFORK;
-- 
2.38.1


-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."