PHP: proc_close - Manual (original) (raw)
(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
proc_close — Close a process opened by proc_open() and return the exit code of that process
Description
Return Values
Returns the termination status of the process that was run. In case of an error then -1 is returned.
Note:
If PHP has been compiled with --enable-sigchild, the return value of this function is undefined.
Found A Problem?
20 years ago
From various Internet posts and recent experience, I have observed that you cannot rely on proc_close returning the accurate return code of the child process. The return code also depends on wether or not you read from the stdout/stderr pipes, as my example shows. I work around this by writing the exit code to an additional file descriptor.
<?
$descriptorspec = array(
0 => array('pipe', 'r'), // stdin is a pipe that the child will read from
1 => array('pipe', 'w'), // stdout is a pipe that the child will write to
2 => array('pipe', 'w'), // stderr is a pipe that the child will write to
);
<span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>p</mi><mi>r</mi><mi>o</mi><mi>c</mi><mo>=</mo><mi mathvariant="normal">@</mi><mi>p</mi><mi>r</mi><mi>o</mi><msub><mi>c</mi><mi>o</mi></msub><mi>p</mi><mi>e</mi><mi>n</mi><mo stretchy="false">(</mo><mi mathvariant="normal">"</mi><mi mathvariant="normal">/</mi><mi>b</mi><mi>i</mi><mi>n</mi><mi mathvariant="normal">/</mi><mi>l</mi><mi>s</mi><mo>−</mo><mi>l</mi><mi mathvariant="normal">/</mi><mi>e</mi><mi>t</mi><mi>c</mi><mi mathvariant="normal">/</mi><mi>p</mi><mi>a</mi><mi>s</mi><mi>s</mi><mi>w</mi><mi>d</mi><mi mathvariant="normal">"</mi><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">proc = @proc_open("/bin/ls -l /etc/passwd", </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.625em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">p</span><span class="mord mathnormal">roc</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord">@</span><span class="mord mathnormal">p</span><span class="mord mathnormal">ro</span><span class="mord"><span class="mord mathnormal">c</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">o</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal">p</span><span class="mord mathnormal">e</span><span class="mord mathnormal">n</span><span class="mopen">(</span><span class="mord">"/</span><span class="mord mathnormal">bin</span><span class="mord">/</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">s</span><span class="mspace" style="margin-right:0.2222em;"></span><span class="mbin">−</span><span class="mspace" style="margin-right:0.2222em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord">/</span><span class="mord mathnormal">e</span><span class="mord mathnormal">t</span><span class="mord mathnormal">c</span><span class="mord">/</span><span class="mord mathnormal">p</span><span class="mord mathnormal">a</span><span class="mord mathnormal">ss</span><span class="mord mathnormal" style="margin-right:0.02691em;">w</span><span class="mord mathnormal">d</span><span class="mord">"</span><span class="mpunct">,</span></span></span></span>descriptorspec, $pipes);
fclose($pipes[0]);
$output = array();
while (!feof($pipes[1])) array_push($output, rtrim(fgets($pipes[1],1024),"\n"));
fclose($pipes[1]);
while (!feof($pipes[2])) array_push($output, rtrim(fgets($pipes[2],1024),"\n"));
fclose($pipes[2]);
<span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>e</mi><mi>x</mi><mi>i</mi><mi>t</mi><mo>=</mo><mi>p</mi><mi>r</mi><mi>o</mi><msub><mi>c</mi><mi>c</mi></msub><mi>l</mi><mi>o</mi><mi>s</mi><mi>e</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">exit=proc_close(</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6595em;"></span><span class="mord mathnormal">e</span><span class="mord mathnormal">x</span><span class="mord mathnormal">i</span><span class="mord mathnormal">t</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">p</span><span class="mord mathnormal">ro</span><span class="mord"><span class="mord mathnormal">c</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">c</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">ose</span><span class="mopen">(</span></span></span></span>proc);
print_r($output);
echo "exitcode $exit\n\n";
$descriptorspec = array(
0 => array('pipe', 'r'), // stdin is a pipe that the child will read from
1 => array('pipe', 'w'), // stdout is a pipe that the child will write to
2 => array('pipe', 'w'), // stderr is a pipe that the child will write to
);
<span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>p</mi><mi>r</mi><mi>o</mi><mi>c</mi><mo>=</mo><mi mathvariant="normal">@</mi><mi>p</mi><mi>r</mi><mi>o</mi><msub><mi>c</mi><mi>o</mi></msub><mi>p</mi><mi>e</mi><mi>n</mi><mo stretchy="false">(</mo><mi mathvariant="normal">"</mi><mi mathvariant="normal">/</mi><mi>b</mi><mi>i</mi><mi>n</mi><mi mathvariant="normal">/</mi><mi>l</mi><mi>s</mi><mo>−</mo><mi>l</mi><mi mathvariant="normal">/</mi><mi>e</mi><mi>t</mi><mi>c</mi><mi mathvariant="normal">/</mi><mi>p</mi><mi>a</mi><mi>s</mi><mi>s</mi><mi>w</mi><mi>d</mi><mi mathvariant="normal">"</mi><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">proc = @proc_open("/bin/ls -l /etc/passwd", </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.625em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">p</span><span class="mord mathnormal">roc</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord">@</span><span class="mord mathnormal">p</span><span class="mord mathnormal">ro</span><span class="mord"><span class="mord mathnormal">c</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">o</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal">p</span><span class="mord mathnormal">e</span><span class="mord mathnormal">n</span><span class="mopen">(</span><span class="mord">"/</span><span class="mord mathnormal">bin</span><span class="mord">/</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">s</span><span class="mspace" style="margin-right:0.2222em;"></span><span class="mbin">−</span><span class="mspace" style="margin-right:0.2222em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord">/</span><span class="mord mathnormal">e</span><span class="mord mathnormal">t</span><span class="mord mathnormal">c</span><span class="mord">/</span><span class="mord mathnormal">p</span><span class="mord mathnormal">a</span><span class="mord mathnormal">ss</span><span class="mord mathnormal" style="margin-right:0.02691em;">w</span><span class="mord mathnormal">d</span><span class="mord">"</span><span class="mpunct">,</span></span></span></span>descriptorspec, $pipes);
fclose($pipes[0]);
fclose($pipes[1]);
fclose($pipes[2]);
<span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>e</mi><mi>x</mi><mi>i</mi><mi>t</mi><mo>=</mo><mi>p</mi><mi>r</mi><mi>o</mi><msub><mi>c</mi><mi>c</mi></msub><mi>l</mi><mi>o</mi><mi>s</mi><mi>e</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">exit=proc_close(</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6595em;"></span><span class="mord mathnormal">e</span><span class="mord mathnormal">x</span><span class="mord mathnormal">i</span><span class="mord mathnormal">t</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">p</span><span class="mord mathnormal">ro</span><span class="mord"><span class="mord mathnormal">c</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">c</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">ose</span><span class="mopen">(</span></span></span></span>proc);
echo "exitcode $exit\n\n";
$descriptorspec = array(
0 => array('pipe', 'r'), // stdin is a pipe that the child will read from
1 => array('pipe', 'w'), // stdout is a pipe that the child will write to
2 => array('pipe', 'w'), // stderr is a pipe that the child will write to
3 => array('pipe', 'w'), // stderr is a pipe that the child will write to
);
<span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>p</mi><mi>r</mi><mi>o</mi><mi>c</mi><mo>=</mo><mi mathvariant="normal">@</mi><mi>p</mi><mi>r</mi><mi>o</mi><msub><mi>c</mi><mi>o</mi></msub><mi>p</mi><mi>e</mi><mi>n</mi><mo stretchy="false">(</mo><mi mathvariant="normal">"</mi><mi mathvariant="normal">/</mi><mi>b</mi><mi>i</mi><mi>n</mi><mi mathvariant="normal">/</mi><mi>l</mi><mi>s</mi><mo>−</mo><mi>l</mi><mi mathvariant="normal">/</mi><mi>e</mi><mi>t</mi><mi>c</mi><mi mathvariant="normal">/</mi><mi>p</mi><mi>a</mi><mi>s</mi><mi>s</mi><mi>w</mi><mi>d</mi><mo separator="true">;</mo><mi>e</mi><mi>c</mi><mi>h</mi><mi>o</mi></mrow><annotation encoding="application/x-tex">proc = @proc_open("/bin/ls -l /etc/passwd;echo </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.625em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">p</span><span class="mord mathnormal">roc</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord">@</span><span class="mord mathnormal">p</span><span class="mord mathnormal">ro</span><span class="mord"><span class="mord mathnormal">c</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">o</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal">p</span><span class="mord mathnormal">e</span><span class="mord mathnormal">n</span><span class="mopen">(</span><span class="mord">"/</span><span class="mord mathnormal">bin</span><span class="mord">/</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">s</span><span class="mspace" style="margin-right:0.2222em;"></span><span class="mbin">−</span><span class="mspace" style="margin-right:0.2222em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord">/</span><span class="mord mathnormal">e</span><span class="mord mathnormal">t</span><span class="mord mathnormal">c</span><span class="mord">/</span><span class="mord mathnormal">p</span><span class="mord mathnormal">a</span><span class="mord mathnormal">ss</span><span class="mord mathnormal" style="margin-right:0.02691em;">w</span><span class="mord mathnormal">d</span><span class="mpunct">;</span><span class="mspace" style="margin-right:0.1667em;"></span><span class="mord mathnormal">ec</span><span class="mord mathnormal">h</span><span class="mord mathnormal">o</span></span></span></span>? >&3", <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>d</mi><mi>e</mi><mi>s</mi><mi>c</mi><mi>r</mi><mi>i</mi><mi>p</mi><mi>t</mi><mi>o</mi><mi>r</mi><mi>s</mi><mi>p</mi><mi>e</mi><mi>c</mi><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">descriptorspec, </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8889em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">d</span><span class="mord mathnormal" style="margin-right:0.02778em;">escr</span><span class="mord mathnormal">i</span><span class="mord mathnormal">pt</span><span class="mord mathnormal">ors</span><span class="mord mathnormal">p</span><span class="mord mathnormal">ec</span><span class="mpunct">,</span></span></span></span>pipes);
fclose($pipes[0]);
$output = array();
//comment next line to get correct exicode
while (!feof($pipes[1])) array_push($output, rtrim(fgets($pipes[1],1024),"\n"));
fclose($pipes[1]);
while (!feof($pipes[2])) array_push($output, rtrim(fgets($pipes[2],1024),"\n"));
fclose($pipes[2]);
if (!feof($pipes[3])) <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>o</mi><mi>u</mi><mi>t</mi><mi>p</mi><mi>u</mi><mi>t</mi><msup><mo stretchy="false">[</mo><mo mathvariant="normal" lspace="0em" rspace="0em">′</mo></msup><mi>e</mi><mi>x</mi><mi>i</mi><mi>t</mi><mi>c</mi><mi>o</mi><mi>d</mi><msup><mi>e</mi><mo mathvariant="normal" lspace="0em" rspace="0em">′</mo></msup><mo stretchy="false">]</mo><mo>=</mo><mi>r</mi><mi>t</mi><mi>r</mi><mi>i</mi><mi>m</mi><mo stretchy="false">(</mo><mi>f</mi><mi>g</mi><mi>e</mi><mi>t</mi><mi>s</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">output['exitcode']=rtrim(fgets(</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1.0019em;vertical-align:-0.25em;"></span><span class="mord mathnormal">o</span><span class="mord mathnormal">u</span><span class="mord mathnormal">tp</span><span class="mord mathnormal">u</span><span class="mord mathnormal">t</span><span class="mopen"><span class="mopen">[</span><span class="msupsub"><span class="vlist-t"><span class="vlist-r"><span class="vlist" style="height:0.7519em;"><span style="top:-3.063em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mtight">′</span></span></span></span></span></span></span></span></span><span class="mord mathnormal">e</span><span class="mord mathnormal">x</span><span class="mord mathnormal">i</span><span class="mord mathnormal">t</span><span class="mord mathnormal">co</span><span class="mord mathnormal">d</span><span class="mord"><span class="mord mathnormal">e</span><span class="msupsub"><span class="vlist-t"><span class="vlist-r"><span class="vlist" style="height:0.7519em;"><span style="top:-3.063em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mtight">′</span></span></span></span></span></span></span></span></span><span class="mclose">]</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">t</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">im</span><span class="mopen">(</span><span class="mord mathnormal" style="margin-right:0.10764em;">f</span><span class="mord mathnormal" style="margin-right:0.03588em;">g</span><span class="mord mathnormal">e</span><span class="mord mathnormal">t</span><span class="mord mathnormal">s</span><span class="mopen">(</span></span></span></span>pipes[3],5),"\n");
fclose($pipes[3]);
proc_close($proc);
print_r($output);
?>
Outputs on my system:
Array
(
[0] => -rw-r--r-- 1 root root 1460 2005-09-02 09:52 /etc/passwd
[1] =>
[2] =>
)
exitcode -1
exitcode 1
Array
(
[0] => -rw-r--r-- 1 root root 1460 2005-09-02 09:52 /etc/passwd
[1] =>
[2] =>
[exitcode] => 0
)10 years ago
Regarding: "Returns the termination status of the process that was run. In case of an error then -1 is returned."
This is, at best, misleading. It returns:
* -1 on error,
* WEXITSTATUS(status) if WIFEXITED(status) is true, or
* status if WIFEXITED(status) is false,
where status is the status parameter of waitpid().
This makes it impossible to differentiate between a relatively normal exit or a termination by signal, and reduces the value of the proc_close return code to a binary one (ok / something broke).
This can be seen in proc_open_rsrc_dtor() in ext/standard/proc_open.c (PHP 5.4.44, 5.6.12).18 years ago
It seems that if you configured --enable-sigchild when you compiled PHP (which from my reading is required for you to use Oracle stuff), then return codes from proc_close() cannot be trusted.
Using proc_open's Example 1998's code on versions I have of PHP4 (4.4.7) and PHP5 (5.2.4), the return code is always "-1". This is also the only return code I can cause by running other shell commands whether they succeed or fail.
I don't see this caveat mentioned anywhere except on this old bug report -- http://bugs.php.net/bug.php?id=2912322 years ago
Under PHP/4.3.3RC2, in case of two processes
these function may hangs. Work around is not use
proc_close, or put it after all fcloses done.
For example, this code hangs.
$ph1 = proc_open("cat",
array(0=>array("pipe","r"),1=>array("pipe","w")),
$pipes1);
$ph2 = proc_open("cat",
array(0=>array("pipe","r"),1=>array("pipe","w")),
$pipes2);
fclose($pipes1[0]); fclose($pipes1[1]); proc_close($ph1);
fclose($pipes2[0]); fclose($pipes2[1]); proc_close($ph2);
This code worked for me:
$ph1 = proc_open("cat",
array(0=>array("pipe","r"),1=>array("pipe","w")),
$pipes1);
$ph2 = proc_open("cat",
array(0=>array("pipe","r"),1=>array("pipe","w")),
$pipes2);
fclose($pipes1[0]); fclose($pipes1[1]);
fclose($pipes2[0]); fclose($pipes2[1]);
proc_close($ph1); proc_close($ph2);morrisdavidd at gmail dot com ¶
17 years ago
Consider the following pseudo code:
$SOME_PROCESS = proc_open(/* something here */);
... <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>s</mi><mi>t</mi><mi>a</mi><mi>t</mi><mi>u</mi><mi>s</mi><mo>=</mo><mi>p</mi><mi>r</mi><mi>o</mi><msub><mi>c</mi><mi>g</mi></msub><mi>e</mi><msub><mi>t</mi><mi>s</mi></msub><mi>t</mi><mi>a</mi><mi>t</mi><mi>u</mi><mi>s</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">status = proc_get_status(</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6151em;"></span><span class="mord mathnormal">s</span><span class="mord mathnormal">t</span><span class="mord mathnormal">a</span><span class="mord mathnormal">t</span><span class="mord mathnormal">u</span><span class="mord mathnormal">s</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1.0361em;vertical-align:-0.2861em;"></span><span class="mord mathnormal">p</span><span class="mord mathnormal">ro</span><span class="mord"><span class="mord mathnormal">c</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight" style="margin-right:0.03588em;">g</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.2861em;"><span></span></span></span></span></span></span><span class="mord mathnormal">e</span><span class="mord"><span class="mord mathnormal">t</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">s</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal">t</span><span class="mord mathnormal">a</span><span class="mord mathnormal">t</span><span class="mord mathnormal">u</span><span class="mord mathnormal">s</span><span class="mopen">(</span></span></span></span>SOME_PROCESS);
... <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>e</mi><mi>x</mi><mi>i</mi><mi>t</mi><mi>C</mi><mi>o</mi><mi>d</mi><mi>e</mi><mo>=</mo><mi>p</mi><mi>r</mi><mi>o</mi><msub><mi>c</mi><mi>c</mi></msub><mi>l</mi><mi>o</mi><mi>s</mi><mi>e</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">exitCode = proc_close(</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal">e</span><span class="mord mathnormal">x</span><span class="mord mathnormal">i</span><span class="mord mathnormal" style="margin-right:0.07153em;">tC</span><span class="mord mathnormal">o</span><span class="mord mathnormal">d</span><span class="mord mathnormal">e</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">p</span><span class="mord mathnormal">ro</span><span class="mord"><span class="mord mathnormal">c</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">c</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">ose</span><span class="mopen">(</span></span></span></span>SOME_PROCESS);
If the external program has exited on its own before the call to proc_get_status, then $exitCode == -1
So consider using: <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>a</mi><mi>c</mi><mi>t</mi><mi>u</mi><mi>a</mi><mi>l</mi><mi>E</mi><mi>x</mi><mi>i</mi><mi>t</mi><mi>C</mi><mi>o</mi><mi>d</mi><mi>e</mi><mo>=</mo><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">actualExitCode = (</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal">a</span><span class="mord mathnormal">c</span><span class="mord mathnormal">t</span><span class="mord mathnormal">u</span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.05764em;">lE</span><span class="mord mathnormal">x</span><span class="mord mathnormal">i</span><span class="mord mathnormal" style="margin-right:0.07153em;">tC</span><span class="mord mathnormal">o</span><span class="mord mathnormal">d</span><span class="mord mathnormal">e</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mopen">(</span></span></span></span>status["running"] ? <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>e</mi><mi>x</mi><mi>i</mi><mi>t</mi><mi>C</mi><mi>o</mi><mi>d</mi><mi>e</mi><mo>:</mo></mrow><annotation encoding="application/x-tex">exitCode : </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal">e</span><span class="mord mathnormal">x</span><span class="mord mathnormal">i</span><span class="mord mathnormal" style="margin-right:0.07153em;">tC</span><span class="mord mathnormal">o</span><span class="mord mathnormal">d</span><span class="mord mathnormal">e</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">:</span></span></span></span>status["exitcode"] );