*: code shrink and better "died from signal" reporting from wait4pid
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
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 1/4 up/down: 3/-41) Total: -38 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/include/libbb.h b/include/libbb.h
index 044d090..72d6c7d 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -812,21 +812,22 @@
#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;