Predefined Constants

    The following list of signals are supported by the Process Control functions. Please see your systems signal(7) man page for details of the default behavior of these signals.

    Process Control constants
    WNOHANG (int)
    WUNTRACED (int)
    SIG_* constants
    SIG_IGN (int)
    SIG_DFL (int)
    SIG_ERR (int)
    SIGHUP (int)
    SIGINFO (int)
    SIGINT (int)
    SIGQUIT (int)
    SIGILL (int)
    SIGTRAP (int)
    SIGABRT (int)
    SIGIOT (int)
    SIGBUS (int)
    SIGFPE (int)
    SIGKILL (int)
    SIGUSR1 (int)
    SIGSEGV (int)
    SIGUSR2 (int)
    SIGPIPE (int)
    SIGALRM (int)
    SIGTERM (int)
    SIGSTKFLT (int)
    SIGCLD (int)
    SIGCHLD (int)
    SIGCONT (int)
    SIGSTOP (int)
    SIGTSTP (int)
    SIGTTIN (int)
    SIGTTOU (int)
    SIGURG (int)
    SIGXCPU (int)
    SIGXFSZ (int)
    SIGVTALRM (int)
    SIGPROF (int)
    SIGWINCH (int)
    SIGPOLL (int)
    SIGIO (int)
    SIGPWR (int)
    SIGSYS (int)
    SIGBABY (int)
    SIG_BLOCK (int)
    SIG_UNBLOCK (int)
    SIG_SETMASK (int)
    SI_* constants
    SI_USER (int)
    SI_NOINFO (int)
    SI_KERNEL (int)
    SI_QUEUE (int)
    SI_TIMER (int)
    SI_MSGGQ (int)
    SI_ASYNCIO (int)
    SI_SIGIO (int)
    SI_TKILL (int)
    CLD_* constants
    CLD_EXITED (int)
    CLD_KILLED (int)
    CLD_DUMPED (int)
    CLD_TRAPPED (int)
    CLD_STOPPED (int)
    CLD_CONTINUED (int)
    TRAP_* constants
    TRAP_BRKPT (int)
    TRAP_TRACE (int)
    POLL_* constants
    POLL_IN (int)
    POLL_OUT (int)
    POLL_MSG (int)
    POLL_ERR (int)
    POLL_PRI (int)
    POLL_HUP (int)
    ILL_* constants
    ILL_ILLOPC (int)
    ILL_ILLOPN (int)
    ILL_ILLADR (int)
    ILL_ILLTRP (int)
    ILL_PRVOPC (int)
    ILL_PRVREG (int)
    ILL_COPROC (int)
    ILL_BADSTK (int)
    FPE_* constants
    FPE_INTDIV (int)
    FPE_INTOVF (int)
    FPE_FLTDIV (int)
    FPE_FLTOVF (int)
    FPE_FLTUND (int)
    FPE_FLTRES (int)
    FPE_FLTINV (int)
    FPE_FLTSUB (int)
    SEGV_* constants
    SEGV_MAPERR (int)
    SEGV_ACCERR (int)
    BUS_* constants
    BUS_ADRALN (int)
    BUS_ADRERR (int)
    BUS_OBJERR (int)
    CLONE_* constants
    CLONE_NEWNS (int)
    Available as of PHP 7.4.0
    CLONE_NEWIPC (int)
    Available as of PHP 7.4.0
    CLONE_NEWUTS (int)
    Available as of PHP 7.4.0
    CLONE_NEWNET (int)
    Available as of PHP 7.4.0
    CLONE_NEWPID (int)
    Available as of PHP 7.4.0
    CLONE_NEWUSER (int)
    Available as of PHP 7.4.0
    CLONE_NEWCGROUP (int)
    Available as of PHP 7.4.0
    PRIO_* constants
    PRIO_PGRP (int)
    PRIO_USER (int)
    PRIO_PROCESS (int)
    PRIO_DARWIN_BG (int)
    Available as of PHP 8.1.0.
    PRIO_DARWIN_THREAD (int)
    Available as of PHP 8.1.0.
    Process Control error constants
    Constants Description
    PCNTL_E2BIG (int) Argument list too long
    PCNTL_EACCES (int) Permission denied
    PCNTL_EAGAIN (int) Resource temporarily unavailable
    PCNTL_ECAPMODE (int) The process attempted an operation not permitted in capability mode while running in capability mode.
    PCNTL_ECHILD (int) No child processes
    PCNTL_EFAULT (int) Bad address
    PCNTL_EINTR (int) Interrupted function call
    PCNTL_EINVAL (int) Invalid argument
    PCNTL_EIO (int) Input/output error
    PCNTL_EISDIR (int) Is a directory
    PCNTL_ELIBBAD (int) Accessing a corrupted shared library.
    PCNTL_ELOOP (int) Too many levels of symbolic links
    PCNTL_EMFILE (int) Too many open files. Commonly caused by exceeding the RLIMIT_NOFILE resource limit. Can also be caused by exceeding the limit specified in /proc/sys/fs/nr_open.
    PCNTL_ENAMETOOLONG (int) Filename too long
    PCNTL_ENFILE (int) Too many open files in system. On Linux, this is probably a result of encountering the /proc/sys/fs/file-max limit.
    PCNTL_ENOENT (int) No such file or directory. Typically, this error results when a specified pathname does not exist, or one of the components in the directory prefix of a pathname does not exist, or the specified pathname is a dangling symbolic link.
    PCNTL_ENOEXEC (int) Exec format error
    PCNTL_ENOMEM (int) Not enough space/cannot allocate memory
    PCNTL_ENOSPC (int) No space left on device
    PCNTL_ENOTDIR (int) Not a directory
    PCNTL_EPERM (int) Operation not permitted
    PCNTL_ESRCH (int) No such process
    PCNTL_ETXTBSY (int) Text file busy
    PCNTL_EUSERS (int) Too many users

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