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 (integer)
WUNTRACED (integer)
SIG_IGN (integer)
SIG_DFL (integer)
SIG_ERR (integer)
SIGHUP (integer)
SIGINT (integer)
SIGQUIT (integer)
SIGILL (integer)
SIGTRAP (integer)
SIGABRT (integer)
SIGIOT (integer)
SIGBUS (integer)
SIGFPE (integer)
SIGKILL (integer)
SIGUSR1 (integer)
SIGSEGV (integer)
SIGUSR2 (integer)
SIGPIPE (integer)
SIGALRM (integer)
SIGTERM (integer)
SIGSTKFLT (integer)
SIGCLD (integer)
SIGCHLD (integer)
SIGCONT (integer)
SIGSTOP (integer)
SIGTSTP (integer)
SIGTTIN (integer)
SIGTTOU (integer)
SIGURG (integer)
SIGXCPU (integer)
SIGXFSZ (integer)
SIGVTALRM (integer)
SIGPROF (integer)
SIGWINCH (integer)
SIGPOLL (integer)
SIGIO (integer)
SIGPWR (integer)
SIGSYS (integer)
SIGBABY (integer)
SIG_BLOCK (integer): Available since PHP 5.3.0.
SIG_UNBLOCK (integer): Available since PHP 5.3.0.
SIG_SETMASK (integer): Available since PHP 5.3.0.
SI_USER (integer): Available since PHP 5.3.0.
SI_NOINFO (integer): Available since PHP 5.3.0.
SI_KERNEL (integer): Available since PHP 5.3.0.
SI_QUEUE (integer): Available since PHP 5.3.0.
SI_TIMER (integer): Available since PHP 5.3.0.
SI_MSGGQ (integer): Available since PHP 5.3.0.
SI_ASYNCIO (integer): Available since PHP 5.3.0.
SI_SIGIO (integer): Available since PHP 5.3.0.
SI_TKILL (integer): Available since PHP 5.3.0.
CLD_EXITED (integer): Available since PHP 5.3.0.
CLD_KILLED (integer): Available since PHP 5.3.0.
CLD_DUMPED (integer): Available since PHP 5.3.0.
CLD_TRAPPED (integer): Available since PHP 5.3.0.
CLD_STOPPED (integer): Available since PHP 5.3.0.
CLD_CONTINUED (integer): Available since PHP 5.3.0.
TRAP_BRKPT (integer): Available since PHP 5.3.0.
TRAP_TRACE (integer): Available since PHP 5.3.0.
POLL_IN (integer): Available since PHP 5.3.0.
POLL_OUT (integer): Available since PHP 5.3.0.
POLL_MSG (integer): Available since PHP 5.3.0.
POLL_ERR (integer): Available since PHP 5.3.0.
POLL_PRI (integer): Available since PHP 5.3.0.
POLL_HUP (integer): Available since PHP 5.3.0.
ILL_ILLOPC (integer): Available since PHP 5.3.0.
ILL_ILLOPN (integer): Available since PHP 5.3.0.
ILL_ILLADR (integer): Available since PHP 5.3.0.
ILL_ILLTRP (integer): Available since PHP 5.3.0.
ILL_PRVOPC (integer): Available since PHP 5.3.0.
ILL_PRVREG (integer): Available since PHP 5.3.0.
ILL_COPROC (integer): Available since PHP 5.3.0.
ILL_BADSTK (integer): Available since PHP 5.3.0.
FPE_INTDIV (integer): Available since PHP 5.3.0.
FPE_INTOVF (integer): Available since PHP 5.3.0.
FPE_FLTDIV (integer): Available since PHP 5.3.0.
FPE_FLTOVF (integer): Available since PHP 5.3.0.
FPE_FLTUND (integer): Available since PHP 5.3.0.
FPE_FLTRES (integer): Available since PHP 5.3.0.
FPE_FLTINV (integer): Available since PHP 5.3.0.
FPE_FLTSUB (integer): Available since PHP 5.3.0.
SEGV_MAPERR (integer): Available since PHP 5.3.0.
SEGV_ACCERR (integer): Available since PHP 5.3.0.
BUS_ADRALN (integer): Available since PHP 5.3.0.
BUS_ADRERR (integer): Available since PHP 5.3.0.
BUS_OBJERR (integer): Available since PHP 5.3.0.

User Contributed Notes

eclecticrob at gmail dot com

4 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

coder dot ua at gmail dot com

1 year 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

eclecticrob at gmail dot com

4 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