• Predefined Constants
  • posix_setrlimit() constants

  • posix_setrlimit constants
  • posix_setrlimit() constants

    posix_setrlimit() constants


    These constants are available starting with PHP
    7.0.0. Please note that some of them may not be available on your


    You may wish to read the below notes in conjunction
    with the manpage for setrlimit() 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.

    POSIX_RLIMIT_AS (integer)
    The maximum size of the process’s address
    space in bytes. See also PHP’s memory_limit
    configuration directive.
    POSIX_RLIMIT_CORE (integer)
    The maximum size of a core file. If the
    limit is set to 0, no core file will be generated.
    POSIX_RLIMIT_CPU (integer)
    The maximum amount of CPU time that the
    process can use, in seconds. When the soft limit is hit, a
    SIGXCPU signal will be sent, which can be caught with
    pcntl_signal(). Depending on the operating
    system, additional SIGXCPU signals may be sent each second
    until the hard limit is hit, at which point an uncatchable
    SIGKILL signal is sent.
    also set_time_limit().
    POSIX_RLIMIT_DATA (integer)
    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 brk() or
    POSIX_RLIMIT_FSIZE (integer)
    The maximum size of files that the
    process can create, in bytes.
    POSIX_RLIMIT_LOCKS (integer)
    The maximum number of locks that the
    process can create. This is only supported on extremely old Linux
    The maximum number of bytes that can be
    locked into memory.
    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
    POSIX_RLIMIT_NICE (integer)
    The maximum value to which the process
    can be reniced to. The value that will be used will be 20 –
    , as resource limit values cannot be
    A value one greater than the maximum file
    descriptor number that can be opened by this process.
    POSIX_RLIMIT_NPROC (integer)
    The maximum number of processes (and/or
    threads, on some operating systems) that can be created for the
    real user ID of the process.
    POSIX_RLIMIT_RSS (integer)
    The maximum size of the process’s
    resident set, in pages.
    The maximum real time priority that can
    be set via the sched_setscheduler() and
    system calls.
    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
    The maximum number of signals that can be
    queued for the real user ID of the process.
    POSIX_RLIMIT_STACK (integer)
    The maximum size of the process stack, in
    Used to indicate an infinite value for a
    resource limit.