1 /*
2 +----------------------------------------------------------------------+
3 | Copyright (c) The PHP Group |
4 +----------------------------------------------------------------------+
5 | This source file is subject to version 3.01 of the PHP license, |
6 | that is bundled with this package in the file LICENSE, and is |
7 | available through the world-wide-web at the following url: |
8 | https://www.php.net/license/3_01.txt |
9 | If you did not receive a copy of the PHP license and are unable to |
10 | obtain it through the world-wide-web, please send a note to |
11 | license@php.net so we can mail you a copy immediately. |
12 +----------------------------------------------------------------------+
13 | Author: Kévin Dunglas <kevin@dunglas.dev> |
14 +----------------------------------------------------------------------+
15 */
16
17 #ifdef ZEND_MAX_EXECUTION_TIMERS
18
19 #include <stdio.h>
20 #include <signal.h>
21 #include <time.h>
22 #include <unistd.h>
23 #include <errno.h>
24 #include <sys/syscall.h>
25 #include <sys/types.h>
26
27 #include "zend.h"
28 #include "zend_globals.h"
29
30 // Musl Libc defines this macro, glibc does not
31 // According to "man 2 timer_create" this field should always be available, but it's not: https://sourceware.org/bugzilla/show_bug.cgi?id=27417
32 # ifndef sigev_notify_thread_id
33 # define sigev_notify_thread_id _sigev_un._tid
34 # endif
35
zend_max_execution_timer_init(void)36 ZEND_API void zend_max_execution_timer_init(void) /* {{{ */
37 {
38 pid_t pid = getpid();
39
40 if (EG(pid) == pid) {
41 return;
42 }
43
44 struct sigevent sev;
45 sev.sigev_notify = SIGEV_THREAD_ID;
46 sev.sigev_value.sival_ptr = &EG(max_execution_timer_timer);
47 sev.sigev_signo = SIGRTMIN;
48 sev.sigev_notify_thread_id = (pid_t) syscall(SYS_gettid);
49
50 // Measure wall time instead of CPU time as originally planned now that it is possible https://github.com/php/php-src/pull/6504#issuecomment-1370303727
51 if (timer_create(CLOCK_BOOTTIME, &sev, &EG(max_execution_timer_timer)) != 0) {
52 zend_strerror_noreturn(E_ERROR, errno, "Could not create timer");
53 }
54
55 EG(pid) = getpid();
56
57 # ifdef MAX_EXECUTION_TIMERS_DEBUG
58 fprintf(stderr, "Timer %#jx created on thread %d\n", (uintmax_t) EG(max_execution_timer_timer), sev.sigev_notify_thread_id);
59 # endif
60
61 sigaction(sev.sigev_signo, NULL, &EG(oldact));
62 }
63 /* }}} */
64
zend_max_execution_timer_settime(zend_long seconds)65 void zend_max_execution_timer_settime(zend_long seconds) /* {{{ }*/
66 {
67 /* Timer not initialized or shutdown. */
68 if (!EG(pid)) {
69 return;
70 }
71
72 timer_t timer = EG(max_execution_timer_timer);
73
74 struct itimerspec its;
75 its.it_value.tv_sec = seconds;
76 its.it_value.tv_nsec = its.it_interval.tv_sec = its.it_interval.tv_nsec = 0;
77
78 # ifdef MAX_EXECUTION_TIMERS_DEBUG
79 fprintf(stderr, "Setting timer %#jx on thread %d (%ld seconds)...\n", (uintmax_t) timer, (pid_t) syscall(SYS_gettid), seconds);
80 # endif
81
82 if (timer_settime(timer, 0, &its, NULL) != 0) {
83 zend_strerror_noreturn(E_ERROR, errno, "Could not set timer");
84 }
85 }
86 /* }}} */
87
zend_max_execution_timer_shutdown(void)88 void zend_max_execution_timer_shutdown(void) /* {{{ */
89 {
90 /* Don't try to delete a timer created before a call to fork() */
91 if (EG(pid) != getpid()) {
92 return;
93 }
94
95 EG(pid) = 0;
96
97 timer_t timer = EG(max_execution_timer_timer);
98
99 # ifdef MAX_EXECUTION_TIMERS_DEBUG
100 fprintf(stderr, "Deleting timer %#jx on thread %d...\n", (uintmax_t) timer, (pid_t) syscall(SYS_gettid));
101 # endif
102
103 int err = timer_delete(timer);
104 if (err != 0) {
105 zend_strerror_noreturn(E_ERROR, errno, "Could not delete timer");
106 }
107 }
108 /* }}}} */
109
110 #endif
111
