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# 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)

Resource Types
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PCNTL
PHP Manual