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Command: exit | Section: 3 | Source: OpenBSD | File: exit.3
EXIT(3) FreeBSD Library Functions Manual EXIT(3)
NAME
exit - perform normal program termination
SYNOPSIS
#include <stdlib.h>
void
exit(int status);
DESCRIPTION
The exit() function terminates a process.
Before termination it performs the following functions in the order
listed:
1. Call the functions registered with the atexit(3) function, in
the reverse order of their registration.
2. Flush all open output streams.
3. Close all open streams.
4. Unlink all files created with the tmpfile(3) function.
Following this, exit() calls _exit(2). Note that typically _exit(2) only
passes the lower 8 bits of status on to the parent, thus negative values
have less meaning.
RETURN VALUES
The exit() function never returns.
SEE ALSO
_exit(2), atexit(3), intro(3), sysexits(3), tmpfile(3)
STANDARDS
The exit() function conforms to ISO/IEC 9899:1999 ("ISO C99").
HISTORY
An exit() function first appeared as a system call in Version 1 AT&T
UNIX. It has accepted the status argument since Version 2 AT&T UNIX. In
Version 7 AT&T UNIX, the bare system call was renamed to _exit(2).
FreeBSD 14.1-RELEASE-p8 August 30, 2024 FreeBSD 14.1-RELEASE-p8