Make vipw error message less cryptic

Unable to find an editor, vipw would give this error:
# env EDITOR=fnord vipw
vipw: pw_edit(): No such file or directory

vigr or crontab do better:
# env EDITOR=fnord crontab -e
crontab: no crontab for root - using an empty one
crontab: fnord: No such file or directory
crontab: "fnord" exited with status 1

After this change, vipw behaves more like vigr or crontab:
# env EDITOR=fnord vipw
vipw: fnord: No such file or directory
vipw: "fnord" exited with status 1

Reviewed by:	rpokala, emaste
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D25369

1 files changed, 8 insertions, 5 deletions

diff --git a/libutil/pw_util.c b/libutil/pw_util.c
index 94db720..4d708c0 100644
--- a/libutil/pw_util.c
+++ b/libutil/pw_util.c
@@ -308,12 +308,13 @@ pw_edit(int notsetuid)
 		sigaction(SIGQUIT, &sa_quit, NULL);
 		sigprocmask(SIG_SETMASK, &oldsigset, NULL);
 		if (notsetuid) {
-			(void)setgid(getgid());
-			(void)setuid(getuid());
+			if (setgid(getgid()) == -1)
+				err(1, "setgid");
+			if (setuid(getuid()) == -1)
+				err(1, "setuid");
 		}
-		errno = 0;
 		execlp(editor, editor, tempname, (char *)NULL);
-		_exit(errno);
+		err(1, "%s", editor);
 	default:
 		/* parent */
 		break;
@@ -327,7 +328,9 @@ pw_edit(int notsetuid)
 			break;
 		} else if (WIFSTOPPED(pstat)) {
 			raise(WSTOPSIG(pstat));
-		} else if (WIFEXITED(pstat) && WEXITSTATUS(pstat) == 0) {
+		} else if (WIFEXITED(pstat)) {
+			if (WEXITSTATUS(pstat) != 0)
+				errx(1, "\"%s\" exited with status %d", editor, WEXITSTATUS(pstat));
 			editpid = -1;
 			break;
 		} else {