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<h2 class="title"><span class="function"><a href="function.posix-setrlimit.html" class="function">posix_setrlimit()</a></span> constants</h2>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
These constants are available starting with PHP 7.0.0. Please note that
some of them may not be available on your system.
</p>
</p></blockquote>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
You may wish to read the below notes in conjunction with the manpage for
<span class="function"><strong>setrlimit()</strong></span> on your specific operating system, as there
is variance in how these limits are interpreted, even across operating
systems that claim to implement POSIX in full.
</p>
</p></blockquote>
<dl>
<dt id="constant.posix-rlimit-as">
<strong><code>POSIX_RLIMIT_AS</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
The maximum size of the process's address space in bytes. See also PHP's
<a href="ini.core.html#ini.memory-limit" class="link">memory_limit</a> configuration
directive.
</span>
</dd>
<dt id="constant.posix-rlimit-core">
<strong><code>POSIX_RLIMIT_CORE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
The maximum size of a core file. If the limit is set to 0, no core file
will be generated.
</span>
</dd>
<dt id="constant.posix-rlimit-cpu">
<strong><code>POSIX_RLIMIT_CPU</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
The maximum amount of CPU time that the process can use, in seconds.
When the soft limit is hit, a <em>SIGXCPU</em> signal will be
sent, which can be caught with <span class="function"><a href="function.pcntl-signal.html" class="function">pcntl_signal()</a></span>.
Depending on the operating system, additional <em>SIGXCPU</em>
signals may be sent each second until the hard limit is hit, at which
point an uncatchable <em>SIGKILL</em> signal is sent.
</span>
<span class="simpara">
See also <span class="function"><a href="function.set-time-limit.html" class="function">set_time_limit()</a></span>.
</span>
</dd>
<dt id="constant.posix-rlimit-data">
<strong><code>POSIX_RLIMIT_DATA</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
The maximum size of the process's data segment, in bytes. It is
extremely unlikely that this will have any effect on the execution of
PHP unless an extension is in use that calls <span class="function"><strong>brk()</strong></span> or
<span class="function"><strong>sbrk()</strong></span>.
</span>
</dd>
<dt id="constant.posix-rlimit-fsize">
<strong><code>POSIX_RLIMIT_FSIZE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
The maximum size of files that the process can create, in bytes.
</span>
</dd>
<dt id="constant.posix-rlimit-locks">
<strong><code>POSIX_RLIMIT_LOCKS</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
The maximum number of locks that the process can create. This is only
supported on extremely old Linux kernels.
</span>
</dd>
<dt id="constant.posix-rlimit-memlock">
<strong><code>POSIX_RLIMIT_MEMLOCK</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
The maximum number of bytes that can be locked into memory.
</span>
</dd>
<dt id="constant.posix-rlimit-msgqueue">
<strong><code>POSIX_RLIMIT_MSGQUEUE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
The maximum number of bytes that can be allocated for POSIX message
queues. PHP does not ship with support for POSIX message queues, so this
limit will not have any effect unless you are using an extension that
implements that support.
</span>
</dd>
<dt id="constant.posix-rlimit-nice">
<strong><code>POSIX_RLIMIT_NICE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
The maximum value to which the process can be
<a href="function.pcntl-setpriority.html" class="link">reniced</a> to. The value
that will be used will be <em>20 - limit</em>, as resource
limit values cannot be negative.
</span>
</dd>
<dt id="constant.posix-rlimit-nofile">
<strong><code>POSIX_RLIMIT_NOFILE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
A value one greater than the maximum file descriptor number that can be
opened by this process.
</span>
</dd>
<dt id="constant.posix-rlimit-nproc">
<strong><code>POSIX_RLIMIT_NPROC</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
The maximum number of processes (and/or threads, on some operating
systems) that can be created for the real user ID of the process.
</span>
</dd>
<dt id="constant.posix-rlimit-rss">
<strong><code>POSIX_RLIMIT_RSS</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
The maximum size of the process's resident set, in pages.
</span>
</dd>
<dt id="constant.posix-rlimit-rtprio">
<strong><code>POSIX_RLIMIT_RTPRIO</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
The maximum real time priority that can be set via the
<span class="function"><strong>sched_setscheduler()</strong></span> and
<span class="function"><strong>sched_setparam()</strong></span> system calls.
</span>
</dd>
<dt id="constant.posix-rlimit-rttime">
<strong><code>POSIX_RLIMIT_RTTIME</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
The maximum amount of CPU time, in microseconds, that the process can
consume without making a blocking system call if it is using real time
scheduling.
</span>
</dd>
<dt id="constant.posix-rlimit-sigpending">
<strong><code>POSIX_RLIMIT_SIGPENDING</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
The maximum number of signals that can be queued for the real user ID of
the process.
</span>
</dd>
<dt id="constant.posix-rlimit-stack">
<strong><code>POSIX_RLIMIT_STACK</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
The maximum size of the process stack, in bytes.
</span>
</dd>
<dt id="constant.posix-rlimit-infinity">
<strong><code>POSIX_RLIMIT_INFINITY</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Used to indicate an infinite value for a resource limit.
</span>
</dd>
</dl>
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