abort - cause abnormal process termination
The abort() 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
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.
The abort() function never returns.
For an explanation of the terms used in this section, see attributes(7).
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
SVr4, POSIX.1-2001, POSIX.1-2008, 4.3BSD, C89, C99.
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