libbb: two new functions: wait_for_exitstatus(pid), xfchdir(fd)
Bartosz Golaszewski proposed xfchdir()
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c
index 206edb4..3f9a84a 100644
--- a/libbb/xfuncs.c
+++ b/libbb/xfuncs.c
@@ -315,3 +315,15 @@
return WTERMSIG(status) + 0x180;
return 0;
}
+
+// Useful when we do know that pid is valid, and we just want to wait
+// for it to exit. Not existing pid is fatal. waitpid() status is not returned.
+int FAST_FUNC wait_for_exitstatus(pid_t pid)
+{
+ int exit_status, n;
+
+ n = safe_waitpid(pid, &exit_status, 0);
+ if (n < 0)
+ bb_perror_msg_and_die("waitpid");
+ return exit_status;
+}