SIGURG
From Wikipedia, the free encyclopedia
| Description: | Urgent condition on socket (4.2BSD) |
|---|---|
| Default action: | Ignore the signal |
| SA_SIGINFO macros | |
| None | |
On POSIX-compliant platforms, SIGURG is the signal thrown by computer programs when a socket has urgent data available to read. In source code, SIGURG is a symbolic constant 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. URG is an abbreviation for urgent.
[edit] Usage
The SIGURG signal is sent to a process employing the asynchronous I/O capabilities offered by the F_SETOWN argument to the fcntl system call on Linux and BSD when out-of-band data is available on a file descriptor connected to a socket. (Such out-of-band data can be read with the recv system call.)
| 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 |
