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*: code shrink and better "died from signal" reporting from wait4pid

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function                                             old     new   delta
parse                                                964     967      +3
udhcp_run_script                                     670     665      -5
singlemount                                          911     906      -5
mount_it_now                                         360     355      -5
inotifyd_main                                        521     516      -5
xspawn                                                21       -     -21
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(add/remove: 0/1 grow/shrink: 1/4 up/down: 3/-41)             Total: -38 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2010-03-18 22:44:00 +01:00
parent c5c006c10c
commit 8531d76a15
12 changed files with 24 additions and 30 deletions
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11
include/libbb.h
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@@ -812,21 +812,22 @@ int bb_execvp(const char *file, char *const argv[]) FAST_FUNC;
#define BB_EXECLP(prog,cmd,...) execlp(prog,cmd, __VA_ARGS__)
#endif
/* NOMMU friendy fork+exec */
/* NOMMU friendy fork+exec: */
pid_t spawn(char **argv) FAST_FUNC;
pid_t xspawn(char **argv) FAST_FUNC;
pid_t safe_waitpid(pid_t pid, int *wstat, int options) FAST_FUNC;
/* Unlike waitpid, waits ONLY for one process.
pid_t wait_any_nohang(int *wstat) FAST_FUNC;
/* wait4pid: unlike waitpid, waits ONLY for one process.
* Returns sig + 0x180 if child is killed by signal.
* It's safe to pass negative 'pids' from failed [v]fork -
* wait4pid will return -1 (and will not clobber [v]fork's errno).
* IOW: rc = wait4pid(spawn(argv));
* if (rc < 0) bb_perror_msg("%s", argv[0]);
* if (rc > 0) bb_error_msg("exit code: %d", rc);
* if (rc > 0) bb_error_msg("exit code: %d", rc & 0xff);
*/
int wait4pid(pid_t pid) FAST_FUNC;
pid_t wait_any_nohang(int *wstat) FAST_FUNC;
/* wait4pid(spawn(argv)) + NOFORK/NOEXEC (if configured) */
/* Same as wait4pid(spawn(argv)), but with NOFORK/NOEXEC if configured: */
int spawn_and_wait(char **argv) FAST_FUNC;
struct nofork_save_area {
jmp_buf die_jmp;