SIGCHLD
Encyclopedia : S : SI : SIG : SIGCHLD
On POSIX compliant platforms, SIGCHLD is the symbolic name for the signal thrown by computer programs when a child process terminates. SIGCHLD is a symbolic constant defined in signal.h. Symbolic signal names are used as signal numbers can vary across platforms.
On Linux, SIGCLD is a synonym for SIGCHLD.
Etymology
SIG- is a common prefix for signal names. CHLD and CLD are abbreviated forms of child.Usage
In UNIX, a process can have children, created by fork or similar system calls. The parent, if available, is notified of the termination of the child process via a SIGCHLD signal. The parent does not need to register for it via the signal system call as it gets this signal by default. This signal can be ignored by the parent if needed.
| POSIX Signals |
| 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 | Realtime Signals are user definable—SIGRTMIN+n through SIGRTMAX. |
| Common non-POSIX signals and synonyms |
| SIGIOT | SIGEMT | SIGSTKFLT | SIGIO | SIGCLD | SIGPWR (SIGINFO) | SIGLOST | SIGWINCH | SIGUNUSED |
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