SIGWINCH
From Wikipedia, the free encyclopedia
| Description: | Window resize signal (4.3BSD, Sun) |
|---|---|
| Default action: | Ignore the signal |
| SA_SIGINFO macros | |
| None | |
On some Unix-like platforms, SIGWINCH is the signal sent to a computer program when its controlling terminal changes size. The symbolic constant for SIGWINCH is defined in the header file signal.h. Symbolic signal names are used because signal numbers can vary across platforms.
[edit] Etymology
SIG is a common prefix for signal names. WINCH is an abbreviation for window [size] change.
[edit] Usage
SIGWINCH is sent when the controlling terminal of a process changes dimensions. Typically this occurs when an xterm or other terminal emulator running in a windowing system is resized, although it can also occur on a text console, for example when the user is running a text windowing system such as GNU Screen. Processes that handle SIGWINCH can use it as an opportunity to find out the new dimensions of the terminal and adjust accordingly (in ncurses-based applications, resizing dialog boxes; in the shell, setting the values of the COLUMNS and LINES environment variables).
| 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 | SIGINFO | SIGPWR (SIGINFO) | SIGLOST | SIGWINCH | SIGUNUSED |
