| Description | Urgent condition on socket (4.2BSD) |
|---|---|
| Default action | Ignore the signal |
| SA_SIGINFO macros | |
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On POSIX-compliant platforms, SIGURG is the signal sent to a process 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.
SIG is a common prefix for signal names. URG is an abbreviation for urgent.
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.)
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