From 21e8e8da6483c80a6054b06e48341968a7dccdd5 Mon Sep 17 00:00:00 2001 From: Pascal Bellard Date: Sun, 4 Jul 2010 00:57:03 +0200 Subject: libbb: introduce and use BB_EXECVP_or_die() function old new delta BB_EXECVP_or_die - 47 +47 time_main 1042 1043 +1 chrt_main 371 364 -7 ionice_main 292 282 -10 setsid_main 69 56 -13 nohup_main 236 223 -13 cttyhack_main 266 253 -13 chroot_main 94 81 -13 chpst_main 746 733 -13 timeout_main 297 279 -18 taskset_main 541 522 -19 vfork_child 67 45 -22 parse 975 953 -22 lpd_main 770 748 -22 launch_helper 192 170 -22 tcpudpsvd_main 1810 1782 -28 nice_main 190 156 -34 env_main 242 206 -36 run_command 221 174 -47 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 1/17 up/down: 48/-352) Total: -304 bytes Signed-off-by: Pascal Bellard Signed-off-by: Denys Vlasenko --- libbb/xfuncs.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) (limited to 'libbb/xfuncs.c') diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c index 65437211d..275dd4b62 100644 --- a/libbb/xfuncs.c +++ b/libbb/xfuncs.c @@ -268,3 +268,37 @@ int FAST_FUNC tcsetattr_stdin_TCSANOW(const struct termios *tp) { return tcsetattr(STDIN_FILENO, TCSANOW, tp); } + +pid_t FAST_FUNC safe_waitpid(pid_t pid, int *wstat, int options) +{ + pid_t r; + + do + r = waitpid(pid, wstat, options); + while ((r == -1) && (errno == EINTR)); + return r; +} + +pid_t FAST_FUNC wait_any_nohang(int *wstat) +{ + return safe_waitpid(-1, wstat, WNOHANG); +} + +// Wait for the specified child PID to exit, returning child's error return. +int FAST_FUNC wait4pid(pid_t pid) +{ + int status; + + if (pid <= 0) { + /*errno = ECHILD; -- wrong. */ + /* we expect errno to be already set from failed [v]fork/exec */ + return -1; + } + if (safe_waitpid(pid, &status, 0) == -1) + return -1; + if (WIFEXITED(status)) + return WEXITSTATUS(status); + if (WIFSIGNALED(status)) + return WTERMSIG(status) + 0x180; + return 0; +} -- cgit v1.2.3