NAME

       abort - cause abnormal process termination

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

       #include <stdlib.h>

       [[noreturn]] void abort(void);

DESCRIPTION

       The  abort()  function  first unblocks the SIGABRT signal, and then raises that signal for
       the calling process (as though  raise(3)  was  called).   This  results  in  the  abnormal
       termination of the process unless the SIGABRT signal is caught and the signal handler does
       not return (see longjmp(3)).

       If the SIGABRT signal is ignored, or  caught  by  a  handler  that  returns,  the  abort()
       function  will  still  terminate  the  process.   It  does  this  by restoring the default
       disposition for SIGABRT and then raising the signal for a second time.

       As with other cases of abnormal termination the functions registered  with  atexit(3)  and
       on_exit(3) are not called.

RETURN VALUE

       The abort() function never returns.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       ┌───────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │Interface                                                      │ Attribute     │ Value   │
       ├───────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │abort()                                                        │ Thread safety │ MT-Safe │
       └───────────────────────────────────────────────────────────────┴───────────────┴─────────┘

STANDARDS

       C11, POSIX.1-2008.

HISTORY

       SVr4, POSIX.1-2001, 4.3BSD, C89.

       Up  until glibc 2.26, if the abort() function caused process termination, all open streams
       were closed and flushed (as with fclose(3)).  However, in some cases this could result  in
       deadlocks  and  data  corruption.  Therefore, starting with glibc 2.27, abort() terminates
       the process without flushing streams.  POSIX.1 permits either  possible  behavior,  saying
       that abort() "may include an attempt to effect fclose() on all open streams".

SEE ALSO

       gdb(1), sigaction(2), assert(3), exit(3), longjmp(3), raise(3)