xref: /PHP-7.4/ext/pcntl/php_signal.c (revision e98e1f92)
1 /*
2    +----------------------------------------------------------------------+
3    | PHP Version 7                                                        |
4    +----------------------------------------------------------------------+
5    | Copyright (c) The PHP Group                                          |
6    +----------------------------------------------------------------------+
7    | This source file is subject to version 3.01 of the PHP license,      |
8    | that is bundled with this package in the file LICENSE, and is        |
9    | available through the world-wide-web at the following url:           |
10    | http://www.php.net/license/3_01.txt                                  |
11    | If you did not receive a copy of the PHP license and are unable to   |
12    | obtain it through the world-wide-web, please send a note to          |
13    | license@php.net so we can mail you a copy immediately.               |
14    +----------------------------------------------------------------------+
15    | Author: Jason Greene <jason@inetgurus.net>                           |
16    +----------------------------------------------------------------------+
17 */
18 
19 #include "TSRM.h"
20 #include "php_signal.h"
21 #include "Zend/zend.h"
22 #include "Zend/zend_signal.h"
23 
24 /* php_signal using sigaction is derived from Advanced Programing
25  * in the Unix Environment by W. Richard Stevens p 298. */
php_signal4(int signo,Sigfunc * func,int restart,int mask_all)26 Sigfunc *php_signal4(int signo, Sigfunc *func, int restart, int mask_all)
27 {
28 	struct sigaction act,oact;
29 
30 #ifdef HAVE_STRUCT_SIGINFO_T
31 	act.sa_sigaction = func;
32 #else
33 	act.sa_handler = func;
34 #endif
35 	if (mask_all) {
36 		sigfillset(&act.sa_mask);
37 	} else {
38 		sigemptyset(&act.sa_mask);
39 	}
40 	act.sa_flags = 0;
41 #ifdef HAVE_STRUCT_SIGINFO_T
42 	act.sa_flags |= SA_SIGINFO;
43 #endif
44 	if (!restart) {
45 #ifdef SA_INTERRUPT
46 		act.sa_flags |= SA_INTERRUPT; /* SunOS */
47 #endif
48 	} else {
49 #ifdef SA_RESTART
50 		act.sa_flags |= SA_RESTART; /* SVR4, 4.3+BSD */
51 #endif
52 	}
53 	if (zend_sigaction(signo, &act, &oact) < 0) {
54 		return (Sigfunc*)SIG_ERR;
55 	}
56 
57 #ifdef HAVE_STRUCT_SIGINFO_T
58 	return oact.sa_sigaction;
59 #else
60 	return oact.sa_handler;
61 #endif
62 }
63 
php_signal(int signo,Sigfunc * func,int restart)64 Sigfunc *php_signal(int signo, Sigfunc *func, int restart)
65 {
66 	return php_signal4(signo, func, restart, 0);
67 }
68