signal (computing)

A signal is an asynchronous event transmitted between one process and another (in Linux, UNIX and other POSIX-compliant operating systems, and also in several real-time operating system). The kill() system call is used to send signals, and the signal() system call is used to set up signal handlers—functions to call when a process receives a signal.

align=center\| POSIX Signals
lign=center\| Reliable Signals
lign=center\| SIGABRT \| SIGALRM \| SIGFPE \| SIGHUP \| SIGILL \| SIGINT \| SIGKILL \| SIGPIPE \| SIGQUIT \| SIGSEGV \| SIGTERM \| SIGUSR1 \| SIGUSR2 \| SIGCHLD \| SIGCONT \| SIGSTOP \| SIGTSTP \| SIGTTIN \| SIGTTOU \| SIGBUS \| SIGPOLL \| SIGPROF \| SIGSYS \| SIGTRAP \| SIGURG \| SIGVTALRM \| SIGXCPU \| SIGXFSZ
lign=center\|Realtime Signals †
lign=center\| SIGRTMIN \| SIGRTMAX
lign=left\| † realtime signals are user definable, the symbolic realtime signals are simply markers for programmers, eg. SIGRTMIN+n.

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