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pcntl.c
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/*
+----------------------------------------------------------------------+
| Copyright (c) The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| https://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Jason Greene <jason@inetgurus.net> |
+----------------------------------------------------------------------+
*/
#define PCNTL_DEBUG 0
#if PCNTL_DEBUG
#define DEBUG_OUT printf("DEBUG: ");printf
#define IF_DEBUG(z) z
#else
#define IF_DEBUG(z)
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "php.h"
#include "php_ini.h"
#include "ext/standard/info.h"
#include "php_pcntl.h"
#include "php_signal.h"
#include "php_ticks.h"
#include "zend_fibers.h"
#if defined(HAVE_GETPRIORITY) || defined(HAVE_SETPRIORITY) || defined(HAVE_WAIT3)
#include <sys/wait.h>
#include <sys/time.h>
#include <sys/resource.h>
#endif
#include <errno.h>
#if defined(HAVE_UNSHARE) || defined(HAVE_SCHED_SETAFFINITY) || defined(HAVE_SCHED_GETCPU)
#include <sched.h>
#if defined(__FreeBSD__)
#include <sys/types.h>
#include <sys/cpuset.h>
typedef cpuset_t cpu_set_t;
#endif
#define PCNTL_CPUSET(mask) &mask
#define PCNTL_CPUSET_SIZE(mask) sizeof(mask)
#define PCNTL_CPU_ISSET(i, mask) CPU_ISSET(i, &mask)
#define PCNTL_CPU_SET(i, mask) CPU_SET(i, &mask)
#define PCNTL_CPU_ZERO(mask) CPU_ZERO(&mask)
#define PCNTL_CPU_DESTROY(mask) ((void)0)
#elif defined(__NetBSD__)
#include <sys/syscall.h>
#include <sched.h>
typedef cpuset_t *cpu_set_t;
#define sched_getaffinity(p, c, m) syscall(SYS__sched_getaffinity, p, 0, c, m)
#define sched_setaffinity(p, c, m) syscall(SYS__sched_setaffinity, p, 0, c, m)
#define PCNTL_CPUSET(mask) mask
#define PCNTL_CPUSET_SIZE(mask) cpuset_size(mask)
#define PCNTL_CPU_ISSET(i, mask) cpuset_isset((cpuid_t)i, mask)
#define PCNTL_CPU_SET(i, mask) cpuset_set((cpuid_t)i, mask)
#define PCNTL_CPU_ZERO(mask) \
do { \
mask = cpuset_create(); \
if (UNEXPECTED(!mask)) { \
php_error_docref(NULL, E_WARNING, "cpuset_create: Insufficient memory"); \
RETURN_FALSE; \
} \
cpuset_zero(mask); \
} while(0)
#define PCNTL_CPU_DESTROY(mask) cpuset_destroy(mask)
#define HAVE_SCHED_SETAFFINITY 1
#endif
#if defined(HAVE_GETCPUID)
#include <sys/processor.h>
#define sched_getcpu getcpuid
#define HAVE_SCHED_GETCPU 1
#endif
#if defined(HAVE_PTHREAD_SET_QOS_CLASS_SELF_NP)
#include <pthread/qos.h>
static zend_class_entry *QosClass_ce;
#endif
#ifdef HAVE_PIDFD_OPEN
#include <sys/syscall.h>
#endif
#ifdef HAVE_FORKX
#include <sys/fork.h>
#endif
#ifndef NSIG
# define NSIG 32
#endif
#define LONG_CONST(c) (zend_long) c
#include "Zend/zend_enum.h"
#include "Zend/zend_max_execution_timer.h"
#include "pcntl_arginfo.h"
ZEND_DECLARE_MODULE_GLOBALS(pcntl)
static PHP_GINIT_FUNCTION(pcntl);
zend_module_entry pcntl_module_entry = {
STANDARD_MODULE_HEADER,
"pcntl",
ext_functions,
PHP_MINIT(pcntl),
PHP_MSHUTDOWN(pcntl),
PHP_RINIT(pcntl),
PHP_RSHUTDOWN(pcntl),
PHP_MINFO(pcntl),
PHP_PCNTL_VERSION,
PHP_MODULE_GLOBALS(pcntl),
PHP_GINIT(pcntl),
NULL,
NULL,
STANDARD_MODULE_PROPERTIES_EX
};
#ifdef COMPILE_DL_PCNTL
#ifdef ZTS
ZEND_TSRMLS_CACHE_DEFINE()
#endif
ZEND_GET_MODULE(pcntl)
#endif
static void (*orig_interrupt_function)(zend_execute_data *execute_data);
#ifdef HAVE_STRUCT_SIGINFO_T
static void pcntl_signal_handler(int, siginfo_t*, void*);
static void pcntl_siginfo_to_zval(int, siginfo_t*, zval*);
#else
static void pcntl_signal_handler(int);
#endif
static void pcntl_signal_dispatch(void);
static void pcntl_signal_dispatch_tick_function(int dummy_int, void *dummy_pointer);
static void pcntl_interrupt_function(zend_execute_data *execute_data);
static PHP_GINIT_FUNCTION(pcntl)
{
#if defined(COMPILE_DL_PCNTL) && defined(ZTS)
ZEND_TSRMLS_CACHE_UPDATE();
#endif
memset(pcntl_globals, 0, sizeof(*pcntl_globals));
}
PHP_RINIT_FUNCTION(pcntl)
{
php_add_tick_function(pcntl_signal_dispatch_tick_function, NULL);
zend_hash_init(&PCNTL_G(php_signal_table), 16, NULL, ZVAL_PTR_DTOR, 0);
PCNTL_G(head) = PCNTL_G(tail) = PCNTL_G(spares) = NULL;
PCNTL_G(async_signals) = 0;
PCNTL_G(last_error) = 0;
PCNTL_G(num_signals) = NSIG;
#ifdef SIGRTMAX
/* At least FreeBSD reports an incorrecrt NSIG that does not include realtime signals.
* As SIGRTMAX may be a dynamic value, adjust the value in INIT. */
if (NSIG < SIGRTMAX + 1) {
PCNTL_G(num_signals) = SIGRTMAX + 1;
}
#endif
return SUCCESS;
}
PHP_MINIT_FUNCTION(pcntl)
{
#if defined(HAVE_PTHREAD_SET_QOS_CLASS_SELF_NP)
QosClass_ce = register_class_QosClass();
#endif
register_pcntl_symbols(module_number);
orig_interrupt_function = zend_interrupt_function;
zend_interrupt_function = pcntl_interrupt_function;
return SUCCESS;
}
PHP_MSHUTDOWN_FUNCTION(pcntl)
{
return SUCCESS;
}
PHP_RSHUTDOWN_FUNCTION(pcntl)
{
struct php_pcntl_pending_signal *sig;
zend_long signo;
zval *handle;
/* Reset all signals to their default disposition */
ZEND_HASH_FOREACH_NUM_KEY_VAL(&PCNTL_G(php_signal_table), signo, handle) {
if (Z_TYPE_P(handle) != IS_LONG || Z_LVAL_P(handle) != (zend_long)SIG_DFL) {
php_signal(signo, (Sigfunc *)(zend_long)SIG_DFL, 0);
}
} ZEND_HASH_FOREACH_END();
zend_hash_destroy(&PCNTL_G(php_signal_table));
while (PCNTL_G(head)) {
sig = PCNTL_G(head);
PCNTL_G(head) = sig->next;
efree(sig);
}
while (PCNTL_G(spares)) {
sig = PCNTL_G(spares);
PCNTL_G(spares) = sig->next;
efree(sig);
}
return SUCCESS;
}
PHP_MINFO_FUNCTION(pcntl)
{
php_info_print_table_start();
php_info_print_table_row(2, "pcntl support", "enabled");
php_info_print_table_end();
}
/* {{{ Forks the currently running process following the same behavior as the UNIX fork() system call*/
PHP_FUNCTION(pcntl_fork)
{
pid_t id;
ZEND_PARSE_PARAMETERS_NONE();
id = fork();
if (id == -1) {
PCNTL_G(last_error) = errno;
switch (errno) {
case EAGAIN:
php_error_docref(NULL, E_WARNING, "Error %d: Reached the maximum limit of number of processes", errno);
break;
case ENOMEM:
php_error_docref(NULL, E_WARNING, "Error %d: Insufficient memory", errno);
break;
// unlikely, especially nowadays.
case ENOSYS:
php_error_docref(NULL, E_WARNING, "Error %d: Unimplemented", errno);
break;
// QNX is the only platform returning it so far and is a different case from EAGAIN.
// Retries can be handled with sleep eventually.
case EBADF:
php_error_docref(NULL, E_WARNING, "Error %d: File descriptor concurrency issue", errno);
break;
default:
php_error_docref(NULL, E_WARNING, "Error %d", errno);
}
} else if (id == 0) {
zend_max_execution_timer_init();
}
RETURN_LONG((zend_long) id);
}
/* }}} */
/* {{{ Set an alarm clock for delivery of a signal*/
PHP_FUNCTION(pcntl_alarm)
{
zend_long seconds;
ZEND_PARSE_PARAMETERS_START(1, 1)
Z_PARAM_LONG(seconds);
ZEND_PARSE_PARAMETERS_END();
RETURN_LONG((zend_long) alarm(seconds));
}
/* }}} */
#define PHP_RUSAGE_PARA(from, to, field) \
add_assoc_long(to, #field, from.field)
#ifndef _OSD_POSIX
#define PHP_RUSAGE_SPECIAL(from, to) \
PHP_RUSAGE_PARA(from, to, ru_oublock); \
PHP_RUSAGE_PARA(from, to, ru_inblock); \
PHP_RUSAGE_PARA(from, to, ru_msgsnd); \
PHP_RUSAGE_PARA(from, to, ru_msgrcv); \
PHP_RUSAGE_PARA(from, to, ru_maxrss); \
PHP_RUSAGE_PARA(from, to, ru_ixrss); \
PHP_RUSAGE_PARA(from, to, ru_idrss); \
PHP_RUSAGE_PARA(from, to, ru_minflt); \
PHP_RUSAGE_PARA(from, to, ru_majflt); \
PHP_RUSAGE_PARA(from, to, ru_nsignals); \
PHP_RUSAGE_PARA(from, to, ru_nvcsw); \
PHP_RUSAGE_PARA(from, to, ru_nivcsw); \
PHP_RUSAGE_PARA(from, to, ru_nswap);
#else /*_OSD_POSIX*/
#define PHP_RUSAGE_SPECIAL(from, to)
#endif
#define PHP_RUSAGE_COMMON(from ,to) \
PHP_RUSAGE_PARA(from, to, ru_utime.tv_usec); \
PHP_RUSAGE_PARA(from, to, ru_utime.tv_sec); \
PHP_RUSAGE_PARA(from, to, ru_stime.tv_usec); \
PHP_RUSAGE_PARA(from, to, ru_stime.tv_sec);
#define PHP_RUSAGE_TO_ARRAY(from, to) \
if (to) { \
PHP_RUSAGE_SPECIAL(from, to) \
PHP_RUSAGE_COMMON(from, to); \
}
/* {{{ Waits on or returns the status of a forked child as defined by the waitpid() system call */
PHP_FUNCTION(pcntl_waitpid)
{
zend_long pid, options = 0;
zval *z_status = NULL, *z_rusage = NULL;
int status;
pid_t child_id;
#ifdef HAVE_WAIT4
struct rusage rusage;
#endif
ZEND_PARSE_PARAMETERS_START(2, 4)
Z_PARAM_LONG(pid)
Z_PARAM_ZVAL(z_status)
Z_PARAM_OPTIONAL
Z_PARAM_LONG(options)
Z_PARAM_ZVAL(z_rusage)
ZEND_PARSE_PARAMETERS_END();
status = zval_get_long(z_status);
#ifdef HAVE_WAIT4
if (z_rusage) {
z_rusage = zend_try_array_init(z_rusage);
if (!z_rusage) {
RETURN_THROWS();
}
memset(&rusage, 0, sizeof(struct rusage));
child_id = wait4((pid_t) pid, &status, options, &rusage);
} else {
child_id = waitpid((pid_t) pid, &status, options);
}
#else
child_id = waitpid((pid_t) pid, &status, options);
#endif
if (child_id < 0) {
PCNTL_G(last_error) = errno;
}
#ifdef HAVE_WAIT4
if (child_id > 0) {
PHP_RUSAGE_TO_ARRAY(rusage, z_rusage);
}
#endif
ZEND_TRY_ASSIGN_REF_LONG(z_status, status);
RETURN_LONG((zend_long) child_id);
}
/* }}} */
/* {{{ Waits on or returns the status of a forked child as defined by the waitpid() system call */
PHP_FUNCTION(pcntl_wait)
{
zend_long options = 0;
zval *z_status = NULL, *z_rusage = NULL;
int status;
pid_t child_id;
#ifdef HAVE_WAIT3
struct rusage rusage;
#endif
ZEND_PARSE_PARAMETERS_START(1, 3)
Z_PARAM_ZVAL(z_status)
Z_PARAM_OPTIONAL
Z_PARAM_LONG(options)
Z_PARAM_ZVAL(z_rusage)
ZEND_PARSE_PARAMETERS_END();
status = zval_get_long(z_status);
#ifdef HAVE_WAIT3
if (z_rusage) {
z_rusage = zend_try_array_init(z_rusage);
if (!z_rusage) {
RETURN_THROWS();
}
memset(&rusage, 0, sizeof(struct rusage));
child_id = wait3(&status, options, &rusage);
} else if (options) {
child_id = wait3(&status, options, NULL);
} else {
child_id = wait(&status);
}
#else
child_id = wait(&status);
#endif
if (child_id < 0) {
PCNTL_G(last_error) = errno;
}
#ifdef HAVE_WAIT3
if (child_id > 0) {
PHP_RUSAGE_TO_ARRAY(rusage, z_rusage);
}
#endif
ZEND_TRY_ASSIGN_REF_LONG(z_status, status);
RETURN_LONG((zend_long) child_id);
}
/* }}} */
#undef PHP_RUSAGE_PARA
#undef PHP_RUSAGE_SPECIAL
#undef PHP_RUSAGE_COMMON
#undef PHP_RUSAGE_TO_ARRAY
/* {{{ Returns true if the child status code represents a successful exit */
PHP_FUNCTION(pcntl_wifexited)
{
zend_long status_word;
ZEND_PARSE_PARAMETERS_START(1, 1)
Z_PARAM_LONG(status_word)
ZEND_PARSE_PARAMETERS_END();
#ifdef WIFEXITED
int int_status_word = (int) status_word;
if (WIFEXITED(int_status_word)) {
RETURN_TRUE;
}
#endif
RETURN_FALSE;
}
/* }}} */
/* {{{ Returns true if the child status code represents a stopped process (WUNTRACED must have been used with waitpid) */
PHP_FUNCTION(pcntl_wifstopped)
{
zend_long status_word;
ZEND_PARSE_PARAMETERS_START(1, 1)
Z_PARAM_LONG(status_word)
ZEND_PARSE_PARAMETERS_END();
#ifdef WIFSTOPPED
int int_status_word = (int) status_word;
if (WIFSTOPPED(int_status_word)) {
RETURN_TRUE;
}
#endif
RETURN_FALSE;
}
/* }}} */
/* {{{ Returns true if the child status code represents a process that was terminated due to a signal */
PHP_FUNCTION(pcntl_wifsignaled)
{
zend_long status_word;
ZEND_PARSE_PARAMETERS_START(1, 1)
Z_PARAM_LONG(status_word)
ZEND_PARSE_PARAMETERS_END();
#ifdef WIFSIGNALED
int int_status_word = (int) status_word;
if (WIFSIGNALED(int_status_word)) {
RETURN_TRUE;
}
#endif
RETURN_FALSE;
}
/* }}} */
/* {{{ Returns true if the child status code represents a process that was resumed due to a SIGCONT signal */
PHP_FUNCTION(pcntl_wifcontinued)
{
zend_long status_word;
ZEND_PARSE_PARAMETERS_START(1, 1)
Z_PARAM_LONG(status_word)
ZEND_PARSE_PARAMETERS_END();
#ifdef HAVE_WCONTINUED
int int_status_word = (int) status_word;
if (WIFCONTINUED(int_status_word)) {
RETURN_TRUE;
}
#endif
RETURN_FALSE;
}
/* }}} */
/* {{{ Returns the status code of a child's exit */
PHP_FUNCTION(pcntl_wexitstatus)
{
zend_long status_word;
ZEND_PARSE_PARAMETERS_START(1, 1)
Z_PARAM_LONG(status_word)
ZEND_PARSE_PARAMETERS_END();
#ifdef WEXITSTATUS
int int_status_word = (int) status_word;
RETURN_LONG(WEXITSTATUS(int_status_word));
#else
RETURN_FALSE;
#endif
}
/* }}} */
/* {{{ Returns the number of the signal that terminated the process who's status code is passed */
PHP_FUNCTION(pcntl_wtermsig)
{
zend_long status_word;
ZEND_PARSE_PARAMETERS_START(1, 1)
Z_PARAM_LONG(status_word)
ZEND_PARSE_PARAMETERS_END();
#ifdef WTERMSIG
int int_status_word = (int) status_word;
RETURN_LONG(WTERMSIG(int_status_word));
#else
RETURN_FALSE;
#endif
}
/* }}} */
/* {{{ Returns the number of the signal that caused the process to stop who's status code is passed */
PHP_FUNCTION(pcntl_wstopsig)
{
zend_long status_word;
ZEND_PARSE_PARAMETERS_START(1, 1)
Z_PARAM_LONG(status_word)
ZEND_PARSE_PARAMETERS_END();
#ifdef WSTOPSIG
int int_status_word = (int) status_word;
RETURN_LONG(WSTOPSIG(int_status_word));
#else
RETURN_FALSE;
#endif
}
/* }}} */
/* {{{ Executes specified program in current process space as defined by exec(2) */
PHP_FUNCTION(pcntl_exec)
{
zval *args = NULL, *envs = NULL;
zval *element;
HashTable *args_hash, *envs_hash;
int argc = 0, argi = 0;
int envc = 0, envi = 0;
char **argv = NULL, **envp = NULL;
char **current_arg, **pair;
size_t pair_length;
zend_string *key;
char *path;
size_t path_len;
zend_ulong key_num;
ZEND_PARSE_PARAMETERS_START(1, 3)
Z_PARAM_PATH(path, path_len)
Z_PARAM_OPTIONAL
Z_PARAM_ARRAY(args)
Z_PARAM_ARRAY(envs)
ZEND_PARSE_PARAMETERS_END();
if (ZEND_NUM_ARGS() > 1) {
/* Build argument list */
SEPARATE_ARRAY(args);
args_hash = Z_ARRVAL_P(args);
argc = zend_hash_num_elements(args_hash);
argv = safe_emalloc((argc + 2), sizeof(char *), 0);
*argv = path;
current_arg = argv+1;
ZEND_HASH_FOREACH_VAL(args_hash, element) {
if (argi >= argc) break;
if (!try_convert_to_string(element)) {
efree(argv);
RETURN_THROWS();
}
*current_arg = Z_STRVAL_P(element);
argi++;
current_arg++;
} ZEND_HASH_FOREACH_END();
*current_arg = NULL;
} else {
argv = emalloc(2 * sizeof(char *));
argv[0] = path;
argv[1] = NULL;
}
if ( ZEND_NUM_ARGS() == 3 ) {
/* Build environment pair list */
SEPARATE_ARRAY(envs);
envs_hash = Z_ARRVAL_P(envs);
envc = zend_hash_num_elements(envs_hash);
pair = envp = safe_emalloc((envc + 1), sizeof(char *), 0);
ZEND_HASH_FOREACH_KEY_VAL(envs_hash, key_num, key, element) {
if (envi >= envc) break;
if (!key) {
key = zend_long_to_str(key_num);
} else {
zend_string_addref(key);
}
if (!try_convert_to_string(element)) {
zend_string_release(key);
efree(argv);
efree(envp);
RETURN_THROWS();
}
/* Length of element + equal sign + length of key + null */
ZEND_ASSERT(Z_STRLEN_P(element) < SIZE_MAX && ZSTR_LEN(key) < SIZE_MAX);
*pair = safe_emalloc(Z_STRLEN_P(element) + 1, sizeof(char), ZSTR_LEN(key) + 1);
pair_length = Z_STRLEN_P(element) + ZSTR_LEN(key) + 2;
strlcpy(*pair, ZSTR_VAL(key), ZSTR_LEN(key) + 1);
strlcat(*pair, "=", pair_length);
strlcat(*pair, Z_STRVAL_P(element), pair_length);
/* Cleanup */
zend_string_release_ex(key, 0);
envi++;
pair++;
} ZEND_HASH_FOREACH_END();
*(pair) = NULL;
if (execve(path, argv, envp) == -1) {
PCNTL_G(last_error) = errno;
php_error_docref(NULL, E_WARNING, "Error has occurred: (errno %d) %s", errno, strerror(errno));
}
/* Cleanup */
for (pair = envp; *pair != NULL; pair++) efree(*pair);
efree(envp);
} else {
if (execv(path, argv) == -1) {
PCNTL_G(last_error) = errno;
php_error_docref(NULL, E_WARNING, "Error has occurred: (errno %d) %s", errno, strerror(errno));
}
}
efree(argv);
RETURN_FALSE;
}
/* }}} */
/* {{{ Assigns a system signal handler to a PHP function */
PHP_FUNCTION(pcntl_signal)
{
zval *handle;
zend_long signo;
bool restart_syscalls = 1;
bool restart_syscalls_is_null = 1;
ZEND_PARSE_PARAMETERS_START(2, 3)
Z_PARAM_LONG(signo)
Z_PARAM_ZVAL(handle)
Z_PARAM_OPTIONAL
Z_PARAM_BOOL_OR_NULL(restart_syscalls, restart_syscalls_is_null)
ZEND_PARSE_PARAMETERS_END();
if (signo < 1) {
zend_argument_value_error(1, "must be greater than or equal to 1");
RETURN_THROWS();
}
if (signo >= PCNTL_G(num_signals)) {
zend_argument_value_error(1, "must be less than %d", PCNTL_G(num_signals));
RETURN_THROWS();
}
if (!PCNTL_G(spares)) {
/* since calling malloc() from within a signal handler is not portable,
* pre-allocate a few records for recording signals */
int i;
for (i = 0; i < PCNTL_G(num_signals); i++) {
struct php_pcntl_pending_signal *psig;
psig = emalloc(sizeof(*psig));
psig->next = PCNTL_G(spares);
PCNTL_G(spares) = psig;
}
}
/* If restart_syscalls was not explicitly specified and the signal is SIGALRM, then default
* restart_syscalls to false. PHP used to enforce that restart_syscalls is false for SIGALRM,
* so we keep this differing default to reduce the degree of BC breakage. */
if (restart_syscalls_is_null && signo == SIGALRM) {
restart_syscalls = 0;
}
/* Special long value case for SIG_DFL and SIG_IGN */
if (Z_TYPE_P(handle) == IS_LONG) {
if (Z_LVAL_P(handle) != (zend_long) SIG_DFL && Z_LVAL_P(handle) != (zend_long) SIG_IGN) {
zend_argument_value_error(2, "must be either SIG_DFL or SIG_IGN when an integer value is given");
RETURN_THROWS();
}
if (php_signal(signo, (Sigfunc *) Z_LVAL_P(handle), (int) restart_syscalls) == (void *)SIG_ERR) {
PCNTL_G(last_error) = errno;
php_error_docref(NULL, E_WARNING, "Error assigning signal");
RETURN_FALSE;
}
zend_hash_index_update(&PCNTL_G(php_signal_table), signo, handle);
RETURN_TRUE;
}
if (!zend_is_callable_ex(handle, NULL, 0, NULL, NULL, NULL)) {
PCNTL_G(last_error) = EINVAL;
zend_argument_type_error(2, "must be of type callable|int, %s given", zend_zval_value_name(handle));
RETURN_THROWS();
}
/* Add the function name to our signal table */
handle = zend_hash_index_update(&PCNTL_G(php_signal_table), signo, handle);
Z_TRY_ADDREF_P(handle);
if (php_signal4(signo, pcntl_signal_handler, (int) restart_syscalls, 1) == (void *)SIG_ERR) {
PCNTL_G(last_error) = errno;
php_error_docref(NULL, E_WARNING, "Error assigning signal");
RETURN_FALSE;
}
RETURN_TRUE;
}
/* }}} */
/* {{{ Gets signal handler */
PHP_FUNCTION(pcntl_signal_get_handler)
{
zval *prev_handle;
zend_long signo;
ZEND_PARSE_PARAMETERS_START(1, 1)
Z_PARAM_LONG(signo)
ZEND_PARSE_PARAMETERS_END();
// note: max signal on mac is SIGUSR2 (31), no real time signals.
int sigmax = NSIG - 1;
#if defined(SIGRTMAX)
// oddily enough, NSIG on freebsd reports only 32 whereas SIGRTMIN starts at 65.
if (sigmax < SIGRTMAX) {
sigmax = SIGRTMAX;
}
#endif
if (signo < 1 || signo > sigmax) {
zend_argument_value_error(1, "must be between 1 and %d", sigmax);
RETURN_THROWS();
}
if ((prev_handle = zend_hash_index_find(&PCNTL_G(php_signal_table), signo)) != NULL) {
RETURN_COPY(prev_handle);
} else {
RETURN_LONG((zend_long)SIG_DFL);
}
}
/* {{{ Dispatch signals to signal handlers */
PHP_FUNCTION(pcntl_signal_dispatch)
{
ZEND_PARSE_PARAMETERS_NONE();
pcntl_signal_dispatch();
RETURN_TRUE;
}
/* }}} */
/* Common helper function for these 3 wrapper functions */
#if defined(HAVE_SIGWAITINFO) || defined(HAVE_SIGTIMEDWAIT) || defined(HAVE_SIGPROCMASK)
static bool php_pcntl_set_user_signal_infos(
/* const */ HashTable *const user_signals,
sigset_t *const set,
size_t arg_num,
bool allow_empty_signal_array
) {
if (!allow_empty_signal_array && zend_hash_num_elements(user_signals) == 0) {
zend_argument_value_error(arg_num, "cannot be empty");
return false;
}
errno = 0;
if (sigemptyset(set) != 0) {
PCNTL_G(last_error) = errno;
php_error_docref(NULL, E_WARNING, "%s", strerror(errno));
return false;
}
zval *user_signal_no;
ZEND_HASH_FOREACH_VAL(user_signals, user_signal_no) {
bool failed = true;
zend_long tmp = zval_try_get_long(user_signal_no, &failed);
if (failed) {
zend_argument_type_error(arg_num, "signals must be of type int, %s given", zend_zval_value_name(user_signal_no));
return false;
}
/* Signals are positive integers */
if (tmp < 1 || tmp >= PCNTL_G(num_signals)) {
/* PCNTL_G(num_signals) stores +1 from the last valid signal */
zend_argument_value_error(arg_num, "signals must be between 1 and %d", PCNTL_G(num_signals)-1);
return false;
}
int signal_no = (int) tmp;
errno = 0;
if (sigaddset(set, signal_no) != 0) {
PCNTL_G(last_error) = errno;
php_error_docref(NULL, E_WARNING, "%s", strerror(errno));
return false;
}
} ZEND_HASH_FOREACH_END();
return true;
}
#endif
#ifdef HAVE_SIGPROCMASK
/* {{{ Examine and change blocked signals */
PHP_FUNCTION(pcntl_sigprocmask)
{
zend_long how;
HashTable *user_set;
/* Optional by-ref out-param array of old signals */
zval *user_old_set = NULL;
ZEND_PARSE_PARAMETERS_START(2, 3)
Z_PARAM_LONG(how)
Z_PARAM_ARRAY_HT(user_set)
Z_PARAM_OPTIONAL
Z_PARAM_ZVAL(user_old_set)
ZEND_PARSE_PARAMETERS_END();
if (how != SIG_BLOCK && how != SIG_UNBLOCK && how != SIG_SETMASK) {
zend_argument_value_error(1, "must be one of SIG_BLOCK, SIG_UNBLOCK, or SIG_SETMASK");
RETURN_THROWS();
}
errno = 0;
sigset_t old_set;
if (sigemptyset(&old_set) != 0) {
PCNTL_G(last_error) = errno;
php_error_docref(NULL, E_WARNING, "%s", strerror(errno));
RETURN_FALSE;
}
sigset_t set;
bool status = php_pcntl_set_user_signal_infos(user_set, &set, 2, /* allow_empty_signal_array */ how == SIG_SETMASK);
/* Some error occurred */
if (!status) {
RETURN_FALSE;
}
if (sigprocmask(how, &set, &old_set) != 0) {
PCNTL_G(last_error) = errno;
php_error_docref(NULL, E_WARNING, "%s", strerror(errno));
RETURN_FALSE;
}
if (user_old_set != NULL) {
user_old_set = zend_try_array_init(user_old_set);
if (!user_old_set) {
RETURN_THROWS();
}
for (int signal_no = 1; signal_no < PCNTL_G(num_signals); ++signal_no) {
if (sigismember(&old_set, signal_no) != 1) {
continue;
}
add_next_index_long(user_old_set, signal_no);
}
}
RETURN_TRUE;
}
/* }}} */
#endif
#ifdef HAVE_STRUCT_SIGINFO_T
# ifdef HAVE_SIGWAITINFO
/* {{{ Synchronously wait for queued signals */
PHP_FUNCTION(pcntl_sigwaitinfo)
{
HashTable *user_set;
/* Optional by-ref array of ints */
zval *user_siginfo = NULL;
ZEND_PARSE_PARAMETERS_START(1, 2)
Z_PARAM_ARRAY_HT(user_set)
Z_PARAM_OPTIONAL
Z_PARAM_ZVAL(user_siginfo)
ZEND_PARSE_PARAMETERS_END();
sigset_t set;
bool status = php_pcntl_set_user_signal_infos(user_set, &set, 1, /* allow_empty_signal_array */ false);
/* Some error occurred */
if (!status) {
RETURN_FALSE;
}
errno = 0;
siginfo_t siginfo;
int signal_no = sigwaitinfo(&set, &siginfo);
/* sigwaitinfo() never sets errno to EAGAIN according to POSIX */
if (signal_no == -1) {
PCNTL_G(last_error) = errno;
php_error_docref(NULL, E_WARNING, "%s", strerror(errno));
RETURN_FALSE;
}
/* sigwaitinfo can return 0 on success on some platforms, e.g. NetBSD */
if (!signal_no && siginfo.si_signo) {
signal_no = siginfo.si_signo;
}
pcntl_siginfo_to_zval(signal_no, &siginfo, user_siginfo);
RETURN_LONG(signal_no);
}
/* }}} */
# endif
# ifdef HAVE_SIGTIMEDWAIT
/* {{{ Wait for queued signals */
PHP_FUNCTION(pcntl_sigtimedwait)
{
HashTable *user_set;
/* Optional by-ref array of ints */
zval *user_siginfo = NULL;
zend_long tv_sec = 0;
zend_long tv_nsec = 0;
ZEND_PARSE_PARAMETERS_START(1, 4)
Z_PARAM_ARRAY_HT(user_set)
Z_PARAM_OPTIONAL
Z_PARAM_ZVAL(user_siginfo)
Z_PARAM_LONG(tv_sec)
Z_PARAM_LONG(tv_nsec)
ZEND_PARSE_PARAMETERS_END();
sigset_t set;
bool status = php_pcntl_set_user_signal_infos(user_set, &set, 1, /* allow_empty_signal_array */ false);
/* Some error occurred */
if (!status) {
RETURN_FALSE;
}
if (tv_sec < 0) {
zend_argument_value_error(3, "must be greater than or equal to 0");
RETURN_THROWS();
}
/* Nanosecond between 0 and 1e9 */
if (tv_nsec < 0 || tv_nsec >= 1000000000) {
zend_argument_value_error(4, "must be between 0 and 1e9");
RETURN_THROWS();
}
if (UNEXPECTED(tv_sec == 0 && tv_nsec == 0)) {
zend_value_error("pcntl_sigtimedwait(): At least one of argument #3 ($seconds) or argument #4 ($nanoseconds) must be greater than 0");
RETURN_THROWS();
}
errno = 0;
siginfo_t siginfo;
struct timespec timeout;
timeout.tv_sec = (time_t) tv_sec;
timeout.tv_nsec = tv_nsec;
int signal_no = sigtimedwait(&set, &siginfo, &timeout);
if (signal_no == -1) {
if (errno != EAGAIN) {
PCNTL_G(last_error) = errno;
php_error_docref(NULL, E_WARNING, "%s", strerror(errno));
}
RETURN_FALSE;
}
/* sigtimedwait can return 0 on success on some platforms, e.g. NetBSD */
if (!signal_no && siginfo.si_signo) {
signal_no = siginfo.si_signo;
}
pcntl_siginfo_to_zval(signal_no, &siginfo, user_siginfo);
RETURN_LONG(signal_no);
}