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authorDenys Vlasenko <vda.linux@googlemail.com>2017-07-25 20:06:17 +0200
committerDenys Vlasenko <vda.linux@googlemail.com>2017-07-25 20:06:17 +0200
commit86981e3ad2d03e77d1f668ac1603a041be448dae (patch)
treeb7474eb7ce7117a4bcc883b5da97463dbbd952f6 /shell
parentf1a5cb0548f647e628032ea8645c0d0d2d07b02f (diff)
downloadbusybox-86981e3ad2d03e77d1f668ac1603a041be448dae.tar.gz
ash: allow "trap NUM [SIG]..." syntax
While at it, make get_signum() return -1 for numeric strings >= NSIG. function old new delta trapcmd 292 306 +14 get_signum 295 300 +5 builtin_trap 413 412 -1 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/1 up/down: 19/-1) Total: 18 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'shell')
-rw-r--r--shell/ash.c9
-rw-r--r--shell/hush.c2
2 files changed, 8 insertions, 3 deletions
diff --git a/shell/ash.c b/shell/ash.c
index b4b0d5253..42e14cbc8 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -12981,13 +12981,18 @@ trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
return 0;
}
+ /* Why the second check?
+ * "trap NUM [sig2]..." is the same as "trap - NUM [sig2]..."
+ * In this case, NUM is signal no, not an action.
+ */
action = NULL;
- if (ap[1])
+ if (ap[1] && !is_number(ap[0]))
action = *ap++;
+
exitcode = 0;
while (*ap) {
signo = get_signum(*ap);
- if (signo < 0 || signo >= NSIG) {
+ if (signo < 0) {
/* Mimic bash message exactly */
ash_msg("%s: invalid signal specification", *ap);
exitcode = 1;
diff --git a/shell/hush.c b/shell/hush.c
index f9dad074f..11b33f40a 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -9745,7 +9745,7 @@ static int FAST_FUNC builtin_trap(char **argv)
sighandler_t handler;
sig = get_signum(*argv++);
- if (sig < 0 || sig >= NSIG) {
+ if (sig < 0) {
ret = EXIT_FAILURE;
/* Mimic bash message exactly */
bb_error_msg("trap: %s: invalid signal specification", argv[-1]);