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.

WNOHANG (int)
WUNTRACED (int)
WCONTINUED (int)
WEXITED (int)
WSTOPPED (int)
WNOWAIT (int)

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)
SIGRTMIN (int)
SIGRTMAX (int)
SIG_BLOCK (int)
SIG_UNBLOCK (int)
SIG_SETMASK (int)
SIGCKPT (int): Generates/restores a checkpoint. Available from PHP 8.4.0 (DragonFlyBSD only).
SIGCKPTEXIT (int): Generates/restores a checkpoint and exit. Available from PHP 8.4.0 (DragonFlyBSD only).

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)
SI_MESGQ (int)

CLD_EXITED (int)
CLD_KILLED (int)
CLD_DUMPED (int)
CLD_TRAPPED (int)
CLD_STOPPED (int)
CLD_CONTINUED (int)

TRAP_BRKPT (int)
TRAP_TRACE (int)

POLL_IN (int)
POLL_OUT (int)
POLL_MSG (int)
POLL_ERR (int)
POLL_PRI (int)
POLL_HUP (int)

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_INTDIV (int)
FPE_INTOVF (int)
FPE_FLTDIV (int)
FPE_FLTOVF (int)
FPE_FLTUND (int)
FPE_FLTRES (int)
FPE_FLTINV (int)
FPE_FLTSUB (int)

SEGV_MAPERR (int)
SEGV_ACCERR (int)

BUS_ADRALN (int)
BUS_ADRERR (int)
BUS_OBJERR (int)

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_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

FORK_NOSIGCHLD (int)
FORK_WAITPID (int)

RFCFDG (int)
RFFDG (int)
RFLINUXTHPN (int)
RFNOWAIT (int)
RFPROC (int)
RFTHREAD (int)
RFTSIGZMB (int)

P_ALL (int): Select any children.
P_PID (int): Select by process ID.
P_PGID (int): Select by process group ID.
P_PIDFD (int): Select by PID file descriptor. Specific to Linux (since Linux 5.4).
P_UID (int): Select by effective user ID. Specific to NetBSD and FreeBSD.
P_GID (int): Select by effective group ID. Specific to NetBSD and FreeBSD.
P_SID (int): Select by session ID. Specific to NetBSD and FreeBSD.
P_JAILID (int): Select by jail identifier. Specific to FreeBSD.

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User Contributed Notes 3 notes

down

coder dot ua at gmail dot com ¶

10 years ago

You should see all signals and their codes in your system using: kill -l
In my Debian GNU/Linux 7.6 (wheezy):

 1) SIGHUP       2) SIGINT       3) SIGQUIT      4) SIGILL       5) SIGTRAP
 6) SIGABRT      7) SIGBUS       8) SIGFPE       9) SIGKILL     10) SIGUSR1
11) SIGSEGV     12) SIGUSR2     13) SIGPIPE     14) SIGALRM     15) SIGTERM
16) SIGSTKFLT   17) SIGCHLD     18) SIGCONT     19) SIGSTOP     20) SIGTSTP
21) SIGTTIN     22) SIGTTOU     23) SIGURG      24) SIGXCPU     25) SIGXFSZ
26) SIGVTALRM   27) SIGPROF     28) SIGWINCH    29) SIGIO       30) SIGPWR
31) SIGSYS      34) SIGRTMIN    35) SIGRTMIN+1  36) SIGRTMIN+2  37) SIGRTMIN+3
38) SIGRTMIN+4  39) SIGRTMIN+5  40) SIGRTMIN+6  41) SIGRTMIN+7  42) SIGRTMIN+8
43) SIGRTMIN+9  44) SIGRTMIN+10 45) SIGRTMIN+11 46) SIGRTMIN+12 47) SIGRTMIN+13
48) SIGRTMIN+14 49) SIGRTMIN+15 50) SIGRTMAX-14 51) SIGRTMAX-13 52) SIGRTMAX-12
53) SIGRTMAX-11 54) SIGRTMAX-10 55) SIGRTMAX-9  56) SIGRTMAX-8  57) SIGRTMAX-7
58) SIGRTMAX-6  59) SIGRTMAX-5  60) SIGRTMAX-4  61) SIGRTMAX-3  62) SIGRTMAX-2
63) SIGRTMAX-1  64) SIGRTMAX

down

eclecticrob at gmail dot com ¶

12 years ago

On OS X, the values of the constants are:

SIGHUP = 1
SIGINT = 2
SIGQUIT = 3
SIGILL = 4
SIGTRAP = 5
SIGABRT = 6
SIGIOT = 6
SIGBUS = 10
SIGFPE = 8
SIGUSR1 = 30
SIGSEGV = 11
SIGUSR2 = 31
SIGPIPE = 13
SIGALRM = 14
SIGTERM = 15
SIGSTKFLT not defined 
SIGCLD not defined 
SIGCHLD = 20
SIGCONT = 19
SIGTSTP = 18
SIGTTIN = 21
SIGTTOU = 22
SIGURG = 16
SIGXCPU = 24
SIGXFSZ = 25
SIGVTALRM = 26
SIGPROF = 27
SIGWINCH = 28
SIGPOLL not defined 
SIGIO = 23
SIGPWR not defined 
SIGSYS = 12
SIGBABY = 12
SIG_BLOCK = 1
SIG_UNBLOCK = 2
SIG_SETMASK = 3

down

-1

eclecticrob at gmail dot com ¶

12 years ago

On RedHat, the values of the constants are:

Signal SIGHUP = 1
Signal SIGINT = 2
Signal SIGQUIT = 3
Signal SIGILL = 4
Signal SIGTRAP = 5
Signal SIGABRT = 6
Signal SIGIOT = 6
Signal SIGBUS = 7
Signal SIGFPE = 8
Signal SIGUSR1 = 10
Signal SIGSEGV = 11
Signal SIGUSR2 = 12
Signal SIGPIPE = 13
Signal SIGALRM = 14
Signal SIGTERM = 15
Signal SIGSTKFLT = 16
Signal SIGCLD = 17
Signal SIGCHLD = 17
Signal SIGCONT = 18
Signal SIGTSTP = 20
Signal SIGTTIN = 21
Signal SIGTTOU = 22
Signal SIGURG = 23
Signal SIGXCPU = 24
Signal SIGXFSZ = 25
Signal SIGVTALRM = 26
Signal SIGPROF = 27
Signal SIGWINCH = 28
Signal SIGPOLL = 29
Signal SIGIO = 29
Signal SIGPWR = 30
Signal SIGSYS = 31
Signal SIGBABY = 31
Signal SIG_BLOCK = 0
Signal SIG_UNBLOCK = 1
Signal SIG_SETMASK = 2

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