| Description | Abort signal from abort |
|---|---|
| Default action | Abnormal termination of the process |
| SA_SIGINFO macros | |
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On POSIX-compliant platforms, SIGABRT is the signal sent to a process to tell it to abort, i.e., to terminate.[1] In source code, SIGABRT is a symbolic constant defined in the header file signal.h. Symbolic signal names are used because signal numbers can vary across platforms.
On some platforms such as Linux, HP-UX and AIX, SIGIOT is a synonym for SIGABRT.
On Linux, HP-UX and Solaris SIGABRT is signal number 6.
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SIG is a common prefix for signal names. ABRT is an abbreviation for abort. [2]
SIGABRT is sent by the process to itself when it calls the abort libc function, defined in stdlib.h. The SIGABRT signal can be caught, but it cannot be blocked; if the signal handler returns then all open streams are closed and flushed and the program terminates (dumping core if appropriate).[3][4] This means that the abort call never returns. Because of this characteristic, it is often used to signal fatal conditions in support libraries, situations where the current operation cannot be completed but the main program can perform cleanup before exiting. It is used when an assertion fails.[5]
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