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[2009-03-04 21:59 UTC] james at jamesreno dot com
Description:
------------
The $status exitcode returned by pcntl_waitpid() is incorrectly casted resulting in an invalid number being returned.
I believe the int is converted to a long in ext/pcntl/pcntl.c, resulting in an invalid integer being returned to the parent.
zval *z_status = NULL;
int status;
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;
z_status is a long, but status is an int...
Reproduce code:
---------------
<?
$pid = pcntl_fork();
if ($pid == -1) {
echo "Unable to fork";
exit;
} elseif ($pid) {
$epid = pcntl_waitpid(-1,$status);
echo "PARENT: {$pid}/{$epid} exited {$status}\n";
exit(128);
} else {
echo "CHILD: Exiting with exit code 128\n";
exit(128);
}
?>
Expected result:
----------------
[james@localhost ~]$ php test.php
CHILD: Exiting with exit code 128
PARENT: 7598/7598 exited 128
[james@localhost ~]$ echo $?
128
[james@localhost ~]$
Actual result:
--------------
[james@localhost ~]$ php test.php
CHILD: Exiting with exit code 128
PARENT: 7598/7598 exited 32768
[james@localhost ~]$ echo $?
128
[james@localhost ~]$
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Last updated: Sat Dec 21 16:01:28 2024 UTC |
exit(254); $pid = pcntl_waitpid(-1,$status); if (pcntl_wifexited($status)) { $status = pcntl_wexitstatus($status); echo $status; } Then why is $status, -2 rather than '254'? This method does not seem work *properly* either...Not bogus.... see below: Its obviously not returning properly: 1. while (($pid=pcntl_waitpid(-1,$status,WNOHANG))>0) { 2. echo "RAW: {$status}\n"; 3. var_dump(pcntl_wifexited($status)); 4. var_dump(pcntl_wexitstatus($status)); 5. var_dump(pcntl_wifsignaled($status)); 6. var_dump(pcntl_wtermsig($status)); 7. var_dump(pcntl_wifstopped($status)); 8. var_dump(pcntl_wstopsig($status)); 9. echo "END RAW: {$status}\n"; 10. } 11. 12. RAW: 65280 13. pcntl_wifexited == bool(true) => pcntl_wexitstatus == int(-1) 14. pcntl_wifsignaled == bool(false) => pcntl_wtermsig == int(0) 15. pcntl_wifstopped == bool(false) => pcntl_wstopsig == int(255) 16. END RAW: 65280 17. 18. 19. RAW: 65280 20. bool(true) 21. int(-1) 22. bool(false) 23. int(0) 24. bool(false) 25. int(255) 26. END RAW: 65280 Guess ill be hax0ring the code to make it work properly. seems the same on PHP 5.3.0-RC2/* {{{ proto int pcntl_wexitstatus(int status) Returns the status code of a child's exit */ PHP_FUNCTION(pcntl_wexitstatus) The function definition says it returns an INT, as it SHOULD -- exit codes can not be negative! and are in the range of 0-255 (8 bits) on posix systems. (iirc). -- HOWEVER -- Php actually returns: 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)); It should NOT, it should not cast it to a (signed char) So if you actually want the right result in your code :( In php-5.2.9/ext/pcntl/pcntl.c line 379 Change: RETURN_LONG((signed char) WEXITSTATUS(status_word)); to: RETURN_LONG(WEXITSTATUS(status_word));