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exit(3) [netbsd man page]

EXIT(3) 						   BSD Library Functions Manual 						   EXIT(3)

NAME
exit -- perform normal program termination LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <stdlib.h> void exit(int status); DESCRIPTION
exit() terminates a process. The status values EXIT_SUCCESS and EXIT_FAILURE can be used to indicate successful and unsuccessful termina- tion, respectively. 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). RESTRICTIONS
Standard C guarantees only that the values zero, EXIT_SUCCESS, and EXIT_FAILURE produce meaningful results. POSIX extends this to guarantee that the least significant 8 bits of status are preserved and returned to the parent via wait(2). Values outside the supported range 0-255 are bitwise-truncated; therefore, negative values should not be used. RETURN VALUES
The exit() function never returns. SEE ALSO
_exit(2), atexit(3), intro(3), tmpfile(3) STANDARDS
The exit() function conforms to ANSI X3.159-1989 (``ANSI C89''). BSD
January 2, 2012 BSD

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EXIT(3) 						   BSD Library Functions Manual 						   EXIT(3)

NAME
exit, _Exit -- perform normal program termination LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <stdlib.h> void exit(int status); void _Exit(int status); DESCRIPTION
The exit() and _Exit() functions terminate a process. Before termination, exit() 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. The _Exit() function terminates without calling the functions registered with the atexit(3) function, and may or may not perform the other actions listed. Both functions make the low-order eight bits of the status argument available to a parent process which has called a wait(2)-family function. The C Standard (ISO/IEC 9899:1999 (``ISO C99'')) defines the values 0, EXIT_SUCCESS, and EXIT_FAILURE as possible values of status. Cooper- ating processes may use other values; in a program which might be called by a mail transfer agent, the values described in sysexits(3) may be used to provide more information to the parent process. Note that exit() does nothing to prevent bottomless recursion should a function registered using atexit(3) itself call exit(). Such func- tions must call _Exit() instead (although this has other effects as well which may not be desired). RETURN VALUES
The exit() and _Exit() functions never return. SEE ALSO
_exit(2), wait(2), atexit(3), intro(3), sysexits(3), tmpfile(3) STANDARDS
The exit() and _Exit() functions conform to ISO/IEC 9899:1999 (``ISO C99''). BSD
September 9, 2002 BSD

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