mirror of
https://github.com/uselessd/alcove.git
synced 2026-04-16 17:55:51 +00:00
aa306a6ab2
I go back and forth with this: be explicit or brief. Especially with
strcmp() where I always WTF.
The code is simpler and easier to read when the checks are explicit. For
example:
// NULL pointer or integer?
if (!x) return;
78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/* Copyright (c) 2014, Michael Santos <michael.santos@gmail.com>
|
|
*
|
|
* Permission to use, copy, modify, and/or distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
#include "alcove.h"
|
|
#include "alcove_call.h"
|
|
#include "alcove_signal_constants.h"
|
|
|
|
/*
|
|
* sigaction(2)
|
|
*
|
|
*/
|
|
ssize_t
|
|
alcove_sys_sigaction(alcove_state_t *ap, const char *arg, size_t len,
|
|
char *reply, size_t rlen)
|
|
{
|
|
int index = 0;
|
|
|
|
int signum = 0;
|
|
char handler[MAXATOMLEN] = {0};
|
|
struct sigaction act;
|
|
int rv = 0;
|
|
|
|
(void)memset(&act, 0, sizeof(act));
|
|
|
|
/* signum */
|
|
switch (alcove_decode_define(arg, len, &index, &signum,
|
|
alcove_signal_constants)) {
|
|
case 0:
|
|
break;
|
|
case 1:
|
|
return alcove_mk_error(reply, rlen, "unsupported");
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
/* handler */
|
|
if (alcove_decode_atom(arg, len, &index, handler) < 0)
|
|
return -1;
|
|
|
|
if (strcmp(handler, "sig_dfl") == 0) {
|
|
act.sa_handler = SIG_DFL;
|
|
}
|
|
else if (strcmp(handler, "sig_ign") == 0) {
|
|
act.sa_handler = SIG_IGN;
|
|
}
|
|
else if (strcmp(handler, "sig_catch") == 0) {
|
|
act.sa_handler = sighandler;
|
|
}
|
|
else {
|
|
return -1;
|
|
}
|
|
|
|
if (signum == SIGCHLD) {
|
|
ALCOVE_SETOPT(ap, alcove_opt_sigchld,
|
|
((act.sa_handler == sighandler) ? 1 : 0));
|
|
return alcove_mk_atom(reply, rlen, "ok");
|
|
}
|
|
|
|
(void)sigfillset(&act.sa_mask);
|
|
|
|
rv = sigaction(signum, &act, NULL);
|
|
|
|
return (rv < 0)
|
|
? alcove_mk_errno(reply, rlen, errno)
|
|
: alcove_mk_atom(reply, rlen, "ok");
|
|
}
|