From 4fb136d7703ceb33fee815d56a074728cf18ea15 Mon Sep 17 00:00:00 2001 From: peter Date: Tue, 13 Aug 2013 20:38:55 +0000 Subject: vfork(2) was listed as deprecated in 1994 (r1573) and was the false reports of its impending demise were removed in 2009 (r199257). However, in 1996 (r16117) system(3) was switched from vfork(2) to fork(2) based partly on this. Switch back to vfork(2). This has a dramatic effect in cases of extreme mmap use - such as excessive abuse (500+) of shared libraries. popen(3) has used vfork(2) for a while. vfork(2) isn't going anywhere. --- lib/libc/stdlib/system.c | 38 +++++++++++++++++++------------------- 1 file changed, 19 insertions(+), 19 deletions(-) (limited to 'lib/libc') diff --git a/lib/libc/stdlib/system.c b/lib/libc/stdlib/system.c index b552a63..64a5447 100644 --- a/lib/libc/stdlib/system.c +++ b/lib/libc/stdlib/system.c @@ -39,6 +39,7 @@ __FBSDID("$FreeBSD$"); #include #include #include +#include #include #include #include @@ -56,37 +57,36 @@ __system(const char *command) if (!command) /* just checking... */ return(1); - /* - * Ignore SIGINT and SIGQUIT, block SIGCHLD. Remember to save - * existing signal dispositions. - */ - ign.sa_handler = SIG_IGN; - (void)sigemptyset(&ign.sa_mask); - ign.sa_flags = 0; - (void)_sigaction(SIGINT, &ign, &intact); - (void)_sigaction(SIGQUIT, &ign, &quitact); (void)sigemptyset(&newsigblock); (void)sigaddset(&newsigblock, SIGCHLD); (void)_sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock); - switch(pid = fork()) { + switch(pid = vfork()) { case -1: /* error */ - break; + (void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL); + return (-1); case 0: /* child */ /* * Restore original signal dispositions and exec the command. */ - (void)_sigaction(SIGINT, &intact, NULL); - (void)_sigaction(SIGQUIT, &quitact, NULL); (void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL); execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL); _exit(127); - default: /* parent */ - savedpid = pid; - do { - pid = _wait4(savedpid, &pstat, 0, (struct rusage *)0); - } while (pid == -1 && errno == EINTR); - break; } + /* + * If we are running means that the child has either completed + * its execve, or has failed. + * Block SIGINT/QUIT because sh -c handles it and wait for + * it to clean up. + */ + memset(&ign, 0, sizeof(ign)); + ign.sa_handler = SIG_IGN; + (void)sigemptyset(&ign.sa_mask); + (void)_sigaction(SIGINT, &ign, &intact); + (void)_sigaction(SIGQUIT, &ign, &quitact); + savedpid = pid; + do { + pid = _wait4(savedpid, &pstat, 0, (struct rusage *)0); + } while (pid == -1 && errno == EINTR); (void)_sigaction(SIGINT, &intact, NULL); (void)_sigaction(SIGQUIT, &quitact, NULL); (void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL); -- cgit v1.1