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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-04-09 15:53:04 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-04-15 11:32:40 -0300 |
| commit | ded3cef36135afa3510ce3c12b982f659b8ea244 (patch) | |
| tree | 5ed66470854edd6dda0c90285da62a22e4de4cc9 /misc/syslog.c | |
| parent | 7cb10381a45767f27409857da1dd9f67ef2c9f96 (diff) | |
| download | glibc-ded3cef36135afa3510ce3c12b982f659b8ea244.tar.gz | |
misc: syslog: Assume MSG_NOSIGNAL support (BZ #17144)
MSG_NOSIGNAL was added on POSIX 2008 and Hurd seems to support it.
The SIGPIPE handling also makes the implementation not thread-safe
(due the sigaction usage).
Checked on x86_64-linux-gnu.
Diffstat (limited to 'misc/syslog.c')
| -rw-r--r-- | misc/syslog.c | 49 |
1 files changed, 4 insertions, 45 deletions
diff --git a/misc/syslog.c b/misc/syslog.c index 33a81da49b..18330a373b 100644 --- a/misc/syslog.c +++ b/misc/syslog.c @@ -74,13 +74,6 @@ __libc_lock_define_initialized (static, syslog_lock) static void openlog_internal(const char *, int, int); static void closelog_internal(void); -#ifndef NO_SIGPIPE -static void sigpipe_handler (int); -#endif - -#ifndef send_flags -# define send_flags 0 -#endif struct cleanup_arg { @@ -95,15 +88,8 @@ cancel_handler (void *ptr) struct cleanup_arg *clarg = (struct cleanup_arg *) ptr; if (clarg != NULL) - { -#ifndef NO_SIGPIPE - if (clarg->oldaction != NULL) - __sigaction (SIGPIPE, clarg->oldaction, NULL); -#endif - - /* Free the memstream buffer, */ - free (clarg->buf); - } + /* Free the memstream buffer, */ + free (clarg->buf); /* Free the lock. */ __libc_lock_unlock (syslog_lock); @@ -160,10 +146,6 @@ __vsyslog_internal(int pri, const char *fmt, va_list ap, char *buf = 0; size_t bufsize = 0; size_t msgoff; -#ifndef NO_SIGPIPE - struct sigaction action, oldaction; - int sigpipe; -#endif int saved_errno = errno; char failbuf[3 * sizeof (pid_t) + sizeof "out of memory []"]; @@ -273,16 +255,6 @@ __vsyslog_internal(int pri, const char *fmt, va_list ap, (void)__writev(STDERR_FILENO, iov, v - iov + 1); } -#ifndef NO_SIGPIPE - /* Prepare for a broken connection. */ - memset (&action, 0, sizeof (action)); - action.sa_handler = sigpipe_handler; - sigemptyset (&action.sa_mask); - sigpipe = __sigaction (SIGPIPE, &action, &oldaction); - if (sigpipe == 0) - clarg.oldaction = &oldaction; -#endif - /* Get connected, output the message to the local logger. */ if (!connected) openlog_internal(NULL, LogStat | LOG_NDELAY, LogFacility); @@ -292,7 +264,7 @@ __vsyslog_internal(int pri, const char *fmt, va_list ap, if (LogType == SOCK_STREAM) ++bufsize; - if (!connected || __send(LogFile, buf, bufsize, send_flags) < 0) + if (!connected || __send(LogFile, buf, bufsize, MSG_NOSIGNAL) < 0) { if (connected) { @@ -302,7 +274,7 @@ __vsyslog_internal(int pri, const char *fmt, va_list ap, openlog_internal(NULL, LogStat | LOG_NDELAY, LogFacility); } - if (!connected || __send(LogFile, buf, bufsize, send_flags) < 0) + if (!connected || __send(LogFile, buf, bufsize, MSG_NOSIGNAL) < 0) { closelog_internal (); /* attempt re-open next time */ /* @@ -320,11 +292,6 @@ __vsyslog_internal(int pri, const char *fmt, va_list ap, } } -#ifndef NO_SIGPIPE - if (sigpipe == 0) - __sigaction (SIGPIPE, &oldaction, (struct sigaction *) NULL); -#endif - out: /* End of critical section. */ __libc_cleanup_pop (0); @@ -396,14 +363,6 @@ openlog (const char *ident, int logstat, int logfac) __libc_cleanup_pop (1); } -#ifndef NO_SIGPIPE -static void -sigpipe_handler (int signo) -{ - closelog_internal (); -} -#endif - static void closelog_internal (void) { |