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-rw-r--r--libbb/xfuncs.c34
1 files changed, 34 insertions, 0 deletions
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)
268{ 268{
269 return tcsetattr(STDIN_FILENO, TCSANOW, tp); 269 return tcsetattr(STDIN_FILENO, TCSANOW, tp);
270} 270}
271
272pid_t FAST_FUNC safe_waitpid(pid_t pid, int *wstat, int options)
273{
274 pid_t r;
275
276 do
277 r = waitpid(pid, wstat, options);
278 while ((r == -1) && (errno == EINTR));
279 return r;
280}
281
282pid_t FAST_FUNC wait_any_nohang(int *wstat)
283{
284 return safe_waitpid(-1, wstat, WNOHANG);
285}
286
287// Wait for the specified child PID to exit, returning child's error return.
288int FAST_FUNC wait4pid(pid_t pid)
289{
290 int status;
291
292 if (pid <= 0) {
293 /*errno = ECHILD; -- wrong. */
294 /* we expect errno to be already set from failed [v]fork/exec */
295 return -1;
296 }
297 if (safe_waitpid(pid, &status, 0) == -1)
298 return -1;
299 if (WIFEXITED(status))
300 return WEXITSTATUS(status);
301 if (WIFSIGNALED(status))
302 return WTERMSIG(status) + 0x180;
303 return 0;
304}