[src/trunk]: src/bin/sh explain why forks fail

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/a92531960978
branches:  trunk
changeset: 326362:a92531960978
user:      christos <christos%NetBSD.org@localhost>
date:      Sun Jan 26 22:38:20 2014 +0000

description:
explain why forks fail

diffstat:

 bin/sh/eval.c |  10 ++++++----
 bin/sh/jobs.c |  12 +++++++-----
 2 files changed, 13 insertions(+), 9 deletions(-)

diffs (76 lines):

diff -r 277cf83eaba1 -r a92531960978 bin/sh/eval.c
--- a/bin/sh/eval.c     Sun Jan 26 21:47:00 2014 +0000
+++ b/bin/sh/eval.c     Sun Jan 26 22:38:20 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: eval.c,v 1.107 2013/06/27 23:22:04 yamt Exp $  */
+/*     $NetBSD: eval.c,v 1.108 2014/01/26 22:38:20 christos Exp $      */
 
 /*-
  * Copyright (c) 1993
@@ -37,7 +37,7 @@
 #if 0
 static char sccsid[] = "@(#)eval.c     8.9 (Berkeley) 6/8/95";
 #else
-__RCSID("$NetBSD: eval.c,v 1.107 2013/06/27 23:22:04 yamt Exp $");
+__RCSID("$NetBSD: eval.c,v 1.108 2014/01/26 22:38:20 christos Exp $");
 #endif
 #endif /* not lint */
 
@@ -845,15 +845,17 @@
                 */
                if (cmdentry.cmdtype == CMDNORMAL) {
                        pid_t   pid;
+                       int serrno;
 
                        savelocalvars = localvars;
                        localvars = NULL;
                        vforked = 1;
                        switch (pid = vfork()) {
                        case -1:
-                               TRACE(("Vfork failed, errno=%d\n", errno));
+                               serrno = errno;
+                               TRACE(("Vfork failed, errno=%d\n", serrno));
                                INTON;
-                               error("Cannot vfork");
+                               error("Cannot vfork (%s)", strerror(serrno));
                                break;
                        case 0:
                                /* Make sure that exceptions only unwind to
diff -r 277cf83eaba1 -r a92531960978 bin/sh/jobs.c
--- a/bin/sh/jobs.c     Sun Jan 26 21:47:00 2014 +0000
+++ b/bin/sh/jobs.c     Sun Jan 26 22:38:20 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: jobs.c,v 1.71 2012/12/31 14:10:15 dsl Exp $    */
+/*     $NetBSD: jobs.c,v 1.72 2014/01/26 22:38:20 christos Exp $       */
 
 /*-
  * Copyright (c) 1991, 1993
@@ -37,7 +37,7 @@
 #if 0
 static char sccsid[] = "@(#)jobs.c     8.5 (Berkeley) 5/4/95";
 #else
-__RCSID("$NetBSD: jobs.c,v 1.71 2012/12/31 14:10:15 dsl Exp $");
+__RCSID("$NetBSD: jobs.c,v 1.72 2014/01/26 22:38:20 christos Exp $");
 #endif
 #endif /* not lint */
 
@@ -858,14 +858,16 @@
 int
 forkshell(struct job *jp, union node *n, int mode)
 {
-       int pid;
+       pid_t pid;
+       int serrno;
 
        TRACE(("forkshell(%%%d, %p, %d) called\n", jp - jobtab, n, mode));
        switch ((pid = fork())) {
        case -1:
-               TRACE(("Fork failed, errno=%d\n", errno));
+               serrno = errno;
+               TRACE(("Fork failed, errno=%d\n", serrno));
                INTON;
-               error("Cannot fork");
+               error("Cannot fork (%s)", strerror(serrno));
                break;
        case 0:
                forkchild(jp, n, mode, 0);