lineedit: do not hang on error, but return error indicator.

[oweals/busybox.git] / libbb / xfuncs.c

diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c
index 65437211d084866524a1b4ed88c0c1e85e54f0a7..07504b75be4997bc4db1689c05a3f76e7c313989 100644 (file)
--- a/libbb/xfuncs.c
+++ b/libbb/xfuncs.c
@@ -6,7 +6,7 @@
  * Copyright (C) 2006 Rob Landley
  * Copyright (C) 2006 Denys Vlasenko
  *
- * Licensed under GPL version 2, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
  */
 
 /* We need to have separate xfuncs.c and xfuncs_printf.c because
@@ -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;
+}