php-src/ext/pcntl/pcntl.c
Jason Greene f30fefcb30 Fix invalid warning caused by bogus convert_to_* calls
Fix possible invalid data in status for pcntl_waitpid()
2002-05-06 23:01:46 +00:00

653 lines
19 KiB
C
Executable File

/*
+----------------------------------------------------------------------+
| PHP Version 4 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2002 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 2.02 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available at through the world-wide-web at |
| http://www.php.net/license/2_02.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> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#define PCNTL_DEBUG 0
#if PCNTL_DEBUG
#define DEBUG_OUT printf("DEBUG: ");printf
#else
#define DEBUG_OUT
#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"
ZEND_DECLARE_MODULE_GLOBALS(pcntl)
static int le_pcntl;
static int pcntl_zend_extension_active;
function_entry pcntl_functions[] = {
PHP_FE(pcntl_fork, NULL)
PHP_FE(pcntl_waitpid, second_arg_force_ref)
PHP_FE(pcntl_signal, NULL)
PHP_FE(pcntl_wifexited, NULL)
PHP_FE(pcntl_wifstopped, NULL)
PHP_FE(pcntl_wifsignaled, NULL)
PHP_FE(pcntl_wexitstatus, NULL)
PHP_FE(pcntl_wtermsig, NULL)
PHP_FE(pcntl_wstopsig, NULL)
PHP_FE(pcntl_exec, NULL)
{NULL, NULL, NULL}
};
zend_module_entry pcntl_module_entry = {
STANDARD_MODULE_HEADER,
"pcntl",
pcntl_functions,
PHP_MINIT(pcntl),
PHP_MSHUTDOWN(pcntl),
NULL,
NULL,
PHP_MINFO(pcntl),
NO_VERSION_YET,
STANDARD_MODULE_PROPERTIES
};
#ifdef COMPILE_DL_PCNTL
ZEND_GET_MODULE(pcntl)
#define PCNTL_ZEND_EXT ZEND_DLEXPORT
#else
#define PCNTL_ZEND_EXT
#endif
PCNTL_ZEND_EXT zend_extension pcntl_extension_entry = {
"pcntl",
"1.0",
"Jason Greene",
"http://www.php.net",
"2001",
pcntl_zend_extension_startup,
pcntl_zend_extension_shutdown,
pcntl_zend_extension_activate,
pcntl_zend_extension_deactivate,
NULL,
NULL,
pcntl_zend_extension_statement_handler,
NULL,
NULL,
NULL,
NULL,
NULL
};
void php_register_signal_constants(INIT_FUNC_ARGS)
{
/* Wait Constants */
#ifdef WNOHANG
REGISTER_LONG_CONSTANT("WNOHANG", (long) WNOHANG, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef WUNTRACED
REGISTER_LONG_CONSTANT("WUNTRACED", (long) WUNTRACED, CONST_CS | CONST_PERSISTENT);
#endif
/* Signal Constants */
REGISTER_LONG_CONSTANT("SIG_IGN", (long) SIG_IGN, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIG_DFL", (long) SIG_DFL, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIG_ERR", (long) SIG_ERR, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGHUP", (long) SIGHUP, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGINT", (long) SIGINT, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGQUIT", (long) SIGQUIT, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGILL", (long) SIGILL, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGTRAP", (long) SIGTRAP, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGABRT", (long) SIGABRT, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGIOT", (long) SIGIOT, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGBUS", (long) SIGBUS, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGFPE", (long) SIGFPE, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGKILL", (long) SIGKILL, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGUSR1", (long) SIGUSR1, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGSEGV", (long) SIGSEGV, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGUSR2", (long) SIGUSR2, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGPIPE", (long) SIGPIPE, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGALRM", (long) SIGALRM, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGTERM", (long) SIGTERM, CONST_CS | CONST_PERSISTENT);
#ifdef SIGSTKFLT
REGISTER_LONG_CONSTANT("SIGSTKFLT",(long) SIGSTKFLT, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef SIGCLD
REGISTER_LONG_CONSTANT("SIGCLD", (long) SIGCLD, CONST_CS | CONST_PERSISTENT);
#endif
#ifdef SIGCHLD
REGISTER_LONG_CONSTANT("SIGCHLD", (long) SIGCHLD, CONST_CS | CONST_PERSISTENT);
#endif
REGISTER_LONG_CONSTANT("SIGCONT", (long) SIGCONT, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGSTOP", (long) SIGSTOP, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGTSTP", (long) SIGTSTP, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGTTIN", (long) SIGTTIN, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGTTOU", (long) SIGTTOU, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGURG", (long) SIGURG , CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGXCPU", (long) SIGXCPU, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGXFSZ", (long) SIGXFSZ, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGVTALRM",(long) SIGVTALRM, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGPROF", (long) SIGPROF, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGWINCH", (long) SIGWINCH, CONST_CS | CONST_PERSISTENT);
#ifdef SIGPOLL
REGISTER_LONG_CONSTANT("SIGPOLL", (long) SIGPOLL, CONST_CS | CONST_PERSISTENT);
#endif
REGISTER_LONG_CONSTANT("SIGIO", (long) SIGIO, CONST_CS | CONST_PERSISTENT);
#ifdef SIGPWR
REGISTER_LONG_CONSTANT("SIGPWR", (long) SIGPWR, CONST_CS | CONST_PERSISTENT);
#endif
REGISTER_LONG_CONSTANT("SIGSYS", (long) SIGSYS, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("SIGBABY", (long) SIGSYS, CONST_CS | CONST_PERSISTENT);
}
static void php_pcntl_init_globals(zend_pcntl_globals *pcntl_globals)
{
zend_hash_init(&pcntl_globals->php_signal_table, 16, NULL, NULL, 1);
/* Just in case ... */
memset(&pcntl_globals->php_signal_queue,0,sizeof(pcntl_globals->php_signal_queue));
zend_llist_init(&pcntl_globals->php_signal_queue, sizeof (long), NULL, 1);
pcntl_globals->signal_queue_ready = 0;
pcntl_globals->processing_signal_queue = 0;
}
static void php_pcntl_shutdown_globals(zend_pcntl_globals *pcntl_globals)
{
zend_hash_destroy(&pcntl_globals->php_signal_table);
zend_llist_destroy(&pcntl_globals->php_signal_queue);
}
PHP_MINIT_FUNCTION(pcntl)
{
php_register_signal_constants(INIT_FUNC_ARGS_PASSTHRU);
ZEND_INIT_MODULE_GLOBALS(pcntl, php_pcntl_init_globals, php_pcntl_shutdown_globals);
if (zend_register_extension(&pcntl_extension_entry, 0)==FAILURE)
return FAILURE;
return SUCCESS;
}
PHP_MSHUTDOWN_FUNCTION(pcntl)
{
zend_hash_destroy(&PCNTL_G(php_signal_table));
zend_llist_destroy(&PCNTL_G(php_signal_queue));
return SUCCESS;
}
PHP_MINFO_FUNCTION(pcntl)
{
php_info_print_table_start();
php_info_print_table_header(2, "pcntl support", "enabled");
php_info_print_table_end();
}
/* {{{ proto int pcntl_fork(void)
Forks the currently running process following the same behavior as the UNIX fork() system call*/
PHP_FUNCTION(pcntl_fork)
{
pid_t id;
id = fork();
if (id == -1) {
php_error(E_ERROR, "Error %d in %s", errno, get_active_function_name(TSRMLS_C));
}
RETURN_LONG((long) id);
}
/* }}} */
/* {{{ proto int pcntl_waitpid(long pid, long status, long options)
Waits on or returns the status of a forked child as defined by the waitpid() system call */
PHP_FUNCTION(pcntl_waitpid)
{
long pid, options = 0;
zval *z_status = NULL;
int status;
pid_t child_id;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "lz|l", &pid, &z_status, &options) == FAILURE)
return;
convert_to_long_ex(&z_status);
status = Z_LVAL_P(z_status);
child_id = waitpid((pid_t) pid, &status, options);
Z_LVAL_P(z_status) = status;
RETURN_LONG((long) child_id);
}
/* }}} */
/* {{{ proto bool pcntl_wifexited(long status)
Returns true if the child status code represents a successful exit */
PHP_FUNCTION(pcntl_wifexited)
{
#ifdef WIFEXITED
zval **status;
int status_word;
if (ZEND_NUM_ARGS() != 1 || zend_get_parameters_ex(ZEND_NUM_ARGS(), &status) == FAILURE) {
WRONG_PARAM_COUNT;
}
status_word = (int) Z_LVAL_PP(status);
if (WIFEXITED(status_word)) RETURN_TRUE;
#endif
RETURN_FALSE;
}
/* }}} */
/* {{{ proto bool pcntl_wifstopped(long status)
Returns true if the child status code represents a stopped process (WUNTRACED must have been used with waitpid) */
PHP_FUNCTION(pcntl_wifstopped)
{
#ifdef WIFSTOPPED
zval **status;
int status_word;
if (ZEND_NUM_ARGS() != 1 || zend_get_parameters_ex(ZEND_NUM_ARGS(), &status) == FAILURE) {
WRONG_PARAM_COUNT;
}
status_word = (int) Z_LVAL_PP(status);
if (WIFSTOPPED(status_word)) RETURN_TRUE;
#endif
RETURN_FALSE;
}
/* }}} */
/* {{{ proto bool pcntl_wifsignaled(long status)
Returns true if the child status code represents a process that was terminated due to a signal */
PHP_FUNCTION(pcntl_wifsignaled)
{
#ifdef WIFSIGNALED
zval **status;
int status_word;
if (ZEND_NUM_ARGS() != 1 || zend_get_parameters_ex(ZEND_NUM_ARGS(), &status) == FAILURE) {
WRONG_PARAM_COUNT;
}
status_word = (int) Z_LVAL_PP(status);
if (WIFSIGNALED(status_word)) RETURN_TRUE;
#endif
RETURN_FALSE;
}
/* }}} */
/* {{{ proto int pcntl_wexitstatus(long status)
Returns the status code of a child's exit */
PHP_FUNCTION(pcntl_wexitstatus)
{
#ifdef WEXITSTATUS
zval **status;
int status_word;
if (ZEND_NUM_ARGS() != 1 || zend_get_parameters_ex(ZEND_NUM_ARGS(), &status) == FAILURE) {
WRONG_PARAM_COUNT;
}
status_word = (int) Z_LVAL_PP(status);
/* WEXITSTATUS only returns 8 bits so we *MUST* cast this to signed char
if you want to have valid negative exit codes */
RETURN_LONG((signed char) WEXITSTATUS(status_word));
#else
RETURN_FALSE;
#endif
}
/* }}} */
/* {{{ proto int pcntl_wtermsig(long status)
Returns the number of the signal that terminated the process who's status code is passed */
PHP_FUNCTION(pcntl_wtermsig)
{
#ifdef WTERMSIG
zval **status;
int status_word;
if (ZEND_NUM_ARGS() != 1 || zend_get_parameters_ex(ZEND_NUM_ARGS(), &status) == FAILURE) {
WRONG_PARAM_COUNT;
}
status_word = (int) Z_LVAL_PP(status);
RETURN_LONG(WTERMSIG(status_word));
#else
RETURN_FALSE;
#endif
}
/* }}} */
/* {{{ proto int pcntl_wstopsig(long status)
Returns the number of the signal that caused the process to stop who's status code is passed */
PHP_FUNCTION(pcntl_wstopsig)
{
#ifdef WSTOPSIG
zval **status;
int status_word;
if (ZEND_NUM_ARGS() != 1 || zend_get_parameters_ex(ZEND_NUM_ARGS(), &status) == FAILURE) {
WRONG_PARAM_COUNT;
}
status_word = (int) Z_LVAL_PP(status);
RETURN_LONG(WSTOPSIG(status_word));
#else
RETURN_FALSE;
#endif
}
/* }}} */
/* {{{ proto bool pcntl_exec(string path [, array args [, array envs]])
Executes specified program in current process space as defined by exec(2) */
PHP_FUNCTION(pcntl_exec)
{
zval *args, *envs;
zval **element;
HashTable *args_hash, *envs_hash;
int argc = 0, argi = 0;
int envc = 0, envi = 0;
int return_val = 0;
char **argv = NULL, **envp = NULL;
char **current_arg, **pair;
int pair_length;
char *key;
int key_length;
char *path;
int path_len;
long key_num;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|aa", &path, &path_len, &args, &envs) == FAILURE) {
return;
}
if (ZEND_NUM_ARGS() > 1) {
/* Build argumnent list */
args_hash = HASH_OF(args);
argc = zend_hash_num_elements(args_hash);
argv = alloca((argc+2) * sizeof(char *));
*argv = path;
for ( zend_hash_internal_pointer_reset(args_hash), current_arg = argv+1;
(argi < argc && (zend_hash_get_current_data(args_hash, (void **) &element) == SUCCESS));
(argi++, current_arg++, zend_hash_move_forward(args_hash)) ) {
convert_to_string_ex(element);
*current_arg = Z_STRVAL_PP(element);
}
*(current_arg) = NULL;
} else {
argv = alloca(2 * sizeof(char *));
*argv = path;
*(argv+1) = NULL;
}
if ( ZEND_NUM_ARGS() == 3 ) {
/* Build environment pair list */
envs_hash = HASH_OF(envs);
envc = zend_hash_num_elements(envs_hash);
envp = alloca((envc+1) * sizeof(char *));
for ( zend_hash_internal_pointer_reset(envs_hash), pair = envp;
(envi < envc && (zend_hash_get_current_data(envs_hash, (void **) &element) == SUCCESS));
(envi++, pair++, zend_hash_move_forward(envs_hash)) ) {
switch (return_val = zend_hash_get_current_key_ex(envs_hash, &key, &key_length, &key_num, 0, NULL)) {
case HASH_KEY_IS_LONG:
key = alloca(101);
snprintf(key, 100, "%ld", key_num);
key_length = strlen(key);
break;
case HASH_KEY_NON_EXISTANT:
pair--;
continue;
}
convert_to_string_ex(element);
/* Length of element + equal sign + length of key + null */
pair_length = Z_STRLEN_PP(element) + key_length + 2;
*pair = emalloc(pair_length);
strlcpy(*pair, key, key_length);
strlcat(*pair, "=", pair_length);
strlcat(*pair, Z_STRVAL_PP(element), pair_length);
/* Cleanup */
if (return_val == HASH_KEY_IS_LONG) free_alloca(key);
}
*(pair) = NULL;
}
if (execve(path, argv, envp) == -1) {
php_error(E_WARNING, "Error has occured in %s: (errno %d) %s",
get_active_function_name(TSRMLS_C), errno, strerror(errno));
}
/* Cleanup */
if (envp != NULL) {
for (pair = envp; *pair != NULL; pair++) efree(*pair);
free_alloca(envp);
}
free_alloca(argv);
RETURN_FALSE;
}
/* }}} */
/* {{{ proto bool pcntl_signal(long signo, mixed handle)
Assigns a system signal handler to a PHP function */
PHP_FUNCTION(pcntl_signal)
{
zval **signo, **handle;
char *func_name;
if (ZEND_NUM_ARGS() != 2 || zend_get_parameters_ex(2, &signo, &handle) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_long_ex(signo);
/* Special long value case for SIG_DFL and SIG_IGN */
if (Z_TYPE_PP(handle)==IS_LONG) {
if (Z_LVAL_PP(handle)!= (long) SIG_DFL && Z_LVAL_PP(handle) != (long) SIG_IGN) {
php_error(E_WARNING, "Invalid value for handle argument specifEied in %s", get_active_function_name(TSRMLS_C));
}
if (php_signal(Z_LVAL_PP(signo), (Sigfunc *) Z_LVAL_PP(handle))==SIG_ERR) {
php_error(E_WARNING, "Error assigning singal in %s", get_active_function_name(TSRMLS_C));
RETURN_FALSE;
}
RETURN_TRUE;
}
if (Z_TYPE_PP(handle) != IS_STRING) {
php_error(E_WARNING, "Invalid type specified for handle argument in %s", get_active_function_name(TSRMLS_C));
RETURN_FALSE;
}
convert_to_string_ex(handle); /* Just in case */
if (!zend_is_callable(*handle, 0, &func_name)) {
php_error(E_WARNING, "%s: %s is not a callable function name error", get_active_function_name(TSRMLS_C), func_name);
efree(func_name);
RETURN_FALSE;
}
efree(func_name);
/* Add the function name to our signal table */
zend_hash_index_update(&PCNTL_G(php_signal_table), Z_LVAL_PP(signo), Z_STRVAL_PP(handle), (Z_STRLEN_PP(handle) + 1) * sizeof(char), NULL);
if (php_signal(Z_LVAL_PP(signo), pcntl_signal_handler)==SIG_ERR) {
php_error(E_WARNING, "Error assigning singal in %s", get_active_function_name(TSRMLS_C));
RETURN_FALSE;
}
RETURN_TRUE;
}
/* }}} */
/* Note Old */
static void old_pcntl_signal_handler(int signo)
{
char *func_name;
zval *param, *call_name, *retval;
TSRMLS_FETCH();
DEBUG_OUT("Caught signal: %d\n", signo);
if (zend_hash_index_find(&PCNTL_G(php_signal_table), (long) signo, (void *) &func_name)==FAILURE) {
DEBUG_OUT("Signl handler not fount");
return;
}
/* DEBUG_OUT("Signal handler found, Calling %s\n", func_name); */
MAKE_STD_ZVAL(param);
MAKE_STD_ZVAL(call_name);
MAKE_STD_ZVAL(retval);
ZVAL_LONG(param, signo);
ZVAL_STRING(call_name, func_name, 1);
/* Call php singal handler - Note that we do not report errors, and we ignore the return value */
call_user_function(EG(function_table), NULL, call_name, retval, 1, &param TSRMLS_CC);
zval_dtor(call_name);
efree(call_name);
efree(param);
efree(retval);
return;
}
/* Our custom signal handler that calls the appropriate php_function */
static void pcntl_signal_handler(int signo)
{
long signal_num = signo;
TSRMLS_FETCH();
DEBUG_OUT("Caught signo %d\n", signo);
if (! PCNTL_G(processing_signal_queue) && pcntl_zend_extension_active ) {
zend_llist_add_element(&PCNTL_G(php_signal_queue), &signal_num);
PCNTL_G(signal_queue_ready) = 1;
DEBUG_OUT("Added queue entry\n");
}
return;
}
/* Pcntl Zend Extension Hooks */
int pcntl_zend_extension_startup(zend_extension *extension)
{
TSRMLS_FETCH();
DEBUG_OUT("Statup Called\n");
pcntl_zend_extension_active = 1;
CG(extended_info) = 1;
return SUCCESS;
}
void pcntl_zend_extension_shutdown(zend_extension *extension)
{
DEBUG_OUT("Shutdown Called\n");
return;
}
void pcntl_zend_extension_activate(void)
{
TSRMLS_FETCH();
DEBUG_OUT("Activate Called\n");
pcntl_zend_extension_active = 1;
CG(extended_info) = 1;
return;
}
void pcntl_zend_extension_deactivate(void)
{
DEBUG_OUT("Deactivate Called\n");
pcntl_zend_extension_active = 0;
return;
}
/* Custom hook to ensure signals only get called at a safe poing in Zend's execute process */
void pcntl_zend_extension_statement_handler(zend_op_array *op_array)
{
zend_llist_element *element;
zval *param, *call_name, *retval;
char *func_name;
TSRMLS_FETCH();
/* Bail if the queue is empty or if we are already playing the queue*/
if (! PCNTL_G(signal_queue_ready) || PCNTL_G(processing_signal_queue))
return;
/* Mark our queue empty */
PCNTL_G(signal_queue_ready) = 0;
/* If for some reason our signal queue is empty then return */
if (zend_llist_count(&PCNTL_G(php_signal_queue)) <= 0) {
return;
}
/* Disable queue so this function is not infinate */
PCNTL_G(processing_signal_queue) = 1;
/* Allocate */
MAKE_STD_ZVAL(param);
MAKE_STD_ZVAL(call_name);
MAKE_STD_ZVAL(retval);
/* Traverse through our signal queue and call the appropriate php functions */
for (element = (&PCNTL_G(php_signal_queue))->head; element; element = element->next) {
long *signal_num = (long *)&element->data;
if (zend_hash_index_find(&PCNTL_G(php_signal_table), *signal_num, (void *) &func_name)==FAILURE) {
continue;
}
ZVAL_LONG(param, *signal_num);
ZVAL_STRING(call_name, func_name, 0);
/* Call php singal handler - Note that we do not report errors, and we ignore the return value */
call_user_function(EG(function_table), NULL, call_name, retval, 1, &param TSRMLS_CC);
}
/* Clear */
zend_llist_clean(&PCNTL_G(php_signal_queue));
/* Re-enable queue */
PCNTL_G(processing_signal_queue) = 0;
/* Clean up */
efree(param);
efree(call_name);
efree(retval);
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
*/