1EXIT(3P) POSIX Programmer's Manual EXIT(3P)
2
6 This manual page is part of the POSIX Programmer's Manual. The Linux
7 implementation of this interface may differ (consult the corresponding
8 Linux manual page for details of Linux behavior), or the interface may
9 not be implemented on Linux.
10
12 exit — terminate a process
13
15 #include <stdlib.h>
16 void exit(int status);
18
20 The functionality described on this reference page is aligned with the
21 ISO C standard. Any conflict between the requirements described here
22 and the ISO C standard is unintentional. This volume of POSIX.1‐2017
23 defers to the ISO C standard.
24 The value of status may be 0, EXIT_SUCCESS, EXIT_FAILURE, or any other
26 value, though only the least significant 8 bits (that is, status &
27 0377) shall be available from wait() and waitpid(); the full value
28 shall be available from waitid() and in the siginfo_t passed to a sig‐
29 nal handler for SIGCHLD.
30 The exit() function shall first call all functions registered by
32 atexit(), in the reverse order of their registration, except that a
33 function is called after any previously registered functions that had
34 already been called at the time it was registered. Each function is
35 called as many times as it was registered. If, during the call to any
36 such function, a call to the longjmp() function is made that would ter‐
37 minate the call to the registered function, the behavior is undefined.
38 If a function registered by a call to atexit() fails to return, the
40 remaining registered functions shall not be called and the rest of the
41 exit() processing shall not be completed. If exit() is called more than
42 once, the behavior is undefined.
43 The exit() function shall then flush all open streams with unwritten
45 buffered data and close all open streams. Finally, the process shall be
46 terminated with the same consequences as described in Consequences of
47 Process Termination.
48
50 The exit() function does not return.
51
53 No errors are defined.
54 The following sections are informative.
56
58 None.
59
61 None.
62
64 See _Exit().
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67 None.
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70 _Exit(), atexit(), exec, longjmp(), tmpfile(), wait(), waitid()
71 The Base Definitions volume of POSIX.1‐2017, <stdlib.h>
73
75 Portions of this text are reprinted and reproduced in electronic form
76 from IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
77 table Operating System Interface (POSIX), The Open Group Base Specifi‐
78 cations Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of
79 Electrical and Electronics Engineers, Inc and The Open Group. In the
80 event of any discrepancy between this version and the original IEEE and
81 The Open Group Standard, the original IEEE and The Open Group Standard
82 is the referee document. The original Standard can be obtained online
83 at http://www.opengroup.org/unix/online.html .
84 Any typographical or formatting errors that appear in this page are
86 most likely to have been introduced during the conversion of the source
87 files to man page format. To report such errors, see https://www.ker‐
88 nel.org/doc/man-pages/reporting_bugs.html .
89IEEE/The Open Group 2017 EXIT(3P)