From: [EMAIL PROTECTED]
Operating system: Linux 2.2.13-33
PHP version: 4.0.3pl1
PHP Bug Type: Scripting Engine problem
Bug description: exec($cmd,$ret,$status) always return $status is -1
PHP scripts
<?
$cmd = "ls";
$ar = array();
exec($cmd, $ar, $atatus);
echo $status;
?>
$status is always -1 (accidential it is 0).
May be PHP's source code file ext/standard/exec.c line 187's pclose(fp) returns -1.
becose main/main.c line 598's signal(SIGCHLD,sigchild_handler) destory child prosess
status.
mey be fixed it to replase ext/standard/exec.c follows.
add include
#include <signal.h>
add variable declaration
void (*sig_hadler)();
add "signal handler for SIGCHLD set to SIG_DFL" at top of _Exec()
sig_handler = signal (SIGCHLD, SIG_DFL);
add "signal handler for SIGCHLD back to before" at before every return statments
signal (SIGCHLD, sig_handler);
This is patch.
-----------------------------start----------------------
diff -uNr php-4.0.3pl1.orig/ext/standard/exec.c php-4.0.3pl1/ext/standard/exec.c
--- php-4.0.3pl1.orig/ext/standard/exec.c Wed Sep 6 01:55:32 2000
+++ php-4.0.3pl1/ext/standard/exec.c Tue Jan 30 16:23:40 2001
@@ -30,6 +30,7 @@
#if HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
+#include <signal.h>
/*
* If type==0, only last line of output is returned (exec)
@@ -46,11 +47,14 @@
int t, l, ret, output=1;
int overflow_limit, lcmd, ldir;
char *b, *c, *d=NULL;
+ void (*sig_handler)();
PLS_FETCH();
+ sig_handler = signal (SIGCHLD, SIG_DFL);
buf = (char*) emalloc(EXEC_INPUT_BUF);
if (!buf) {
php_error(E_WARNING, "Unable to emalloc %d bytes for exec buffer",
EXEC_INPUT_BUF);
+ signal (SIGCHLD, sig_handler);
return -1;
}
buflen = EXEC_INPUT_BUF;
@@ -65,6 +69,7 @@
if (strstr(cmd, "..")) {
php_error(E_WARNING, "No '..' components allowed in path");
efree(buf);
+ signal (SIGCHLD, sig_handler);
return -1;
}
d = emalloc(l);
@@ -95,6 +100,7 @@
php_error(E_WARNING, "Unable to fork [%s]", d);
efree(d);
efree(buf);
+ signal (SIGCHLD, sig_handler);
return -1;
}
} else { /* not safe_mode */
@@ -106,6 +112,7 @@
if (!fp) {
php_error(E_WARNING, "Unable to fork [%s]", cmd);
efree(buf);
+ signal (SIGCHLD, sig_handler);
return -1;
}
}
@@ -127,6 +134,7 @@
if ( buf == NULL ) {
php_error(E_WARNING, "Unable to
erealloc %d bytes for exec buffer",
buflen +
EXEC_INPUT_BUF);
+ signal (SIGCHLD, sig_handler);
return -1;
}
buflen += EXEC_INPUT_BUF;
@@ -190,6 +198,7 @@
ret = WEXITSTATUS(ret);
}
#endif
+ signal (SIGCHLD, sig_handler);
if (d) efree(d);
efree(buf);
-----------------------------end----------------------
pclose() function is also used in ext/standard/file.c mail.c ext/imap/php_imap.c.
I do not know this influence.
This is part of my phpinfo() outputs.
Configure Command
'./configure' '--enable-sigchild'
'--libdir=/var/tmp/php-root/usr/lib/php4'
'--includedir=/usr/include'
'--with-pgsql=shared' '--with-interbase'
'--prefix=/var/tmp/php-root//usr'
'--with-apxs=/usr/sbin/apxs'
'--with-config-file-path=/etc/httpd'
'--enable-safe-mode'
'--disable-debug' '--with-zlib'
'--with-gd' '--with-cpdflib'
'--enable-debugger'
'--enable-magic-quotes' '--enable-track-vars'
'--enable-versioning'
--
Edit Bug report at: http://bugs.php.net/?id=8992&edit=1
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