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1 | .\" Hey Emacs! This file is -*- nroff -*- source. |
2 | .\" | |
3 | .\" This manpage is Copyright (C) 1992 Drew Eckhardt; | |
4 | .\" 1993 Michael Haardt, Ian Jackson. | |
5 | .\" | |
6 | .\" Permission is granted to make and distribute verbatim copies of this | |
7 | .\" manual provided the copyright notice and this permission notice are | |
8 | .\" preserved on all copies. | |
9 | .\" | |
10 | .\" Permission is granted to copy and distribute modified versions of this | |
11 | .\" manual under the conditions for verbatim copying, provided that the | |
12 | .\" entire resulting derived work is distributed under the terms of a | |
13 | .\" permission notice identical to this one. | |
c13182ef | 14 | .\" |
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15 | .\" Since the Linux kernel and libraries are constantly changing, this |
16 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
17 | .\" responsibility for errors or omissions, or for damages resulting from | |
18 | .\" the use of the information contained herein. The author(s) may not | |
19 | .\" have taken the same level of care in the production of this manual, | |
20 | .\" which is licensed free of charge, as they might when working | |
21 | .\" professionally. | |
c13182ef | 22 | .\" |
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23 | .\" Formatted or processed versions of this manual, if unaccompanied by |
24 | .\" the source, must acknowledge the copyright and authors of this work. | |
25 | .\" | |
26 | .\" Modified Wed Jul 21 23:02:38 1993 by Rik Faith <faith@cs.unc.edu> | |
27 | .\" Modified 2001-11-17, aeb | |
28 | .\" | |
50831f9b | 29 | .TH _EXIT 2 2010-09-20 "Linux" "Linux Programmer's Manual" |
fea681da | 30 | .SH NAME |
a1ffe9f5 | 31 | _exit, _Exit \- terminate the calling process |
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32 | .SH SYNOPSIS |
33 | .B #include <unistd.h> | |
34 | .sp | |
35 | .BI "void _exit(int " status ); | |
36 | .sp | |
37 | .B #include <stdlib.h> | |
38 | .sp | |
39 | .BI "void _Exit(int " status ); | |
cc4615cc MK |
40 | .sp |
41 | .in -4n | |
42 | Feature Test Macro Requirements for glibc (see | |
43 | .BR feature_test_macros (7)): | |
44 | .in | |
45 | .sp | |
e0a98111 | 46 | .ad l |
cc4615cc | 47 | .BR _Exit (): |
e0a98111 | 48 | .RS 4 |
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49 | _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE || |
50 | _POSIX_C_SOURCE\ >=\ 200112L; | |
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51 | .br |
52 | or | |
cc4615cc | 53 | .I cc\ -std=c99 |
c9f2ff9d | 54 | .RE |
e0a98111 | 55 | .ad |
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56 | .SH DESCRIPTION |
57 | The function | |
63aa9df0 | 58 | .BR _exit () |
c13182ef MK |
59 | terminates the calling process "immediately". |
60 | Any open file descriptors | |
fea681da | 61 | belonging to the process are closed; any children of the process are |
c13182ef | 62 | inherited by process 1, |
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63 | .IR init , |
64 | and the process's parent is sent a | |
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65 | .B SIGCHLD |
66 | signal. | |
67 | .LP | |
68 | The value | |
69 | .I status | |
70 | is returned to the parent process as the process's exit status, and | |
71 | can be collected using one of the | |
0bfa087b | 72 | .BR wait (2) |
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73 | family of calls. |
74 | .LP | |
75 | The function | |
63aa9df0 | 76 | .BR _Exit () |
fea681da | 77 | is equivalent to |
63aa9df0 | 78 | .BR _exit (). |
47297adb | 79 | .SH RETURN VALUE |
fea681da | 80 | These functions do not return. |
47297adb | 81 | .SH CONFORMING TO |
97c1eac8 | 82 | SVr4, POSIX.1-2001, 4.3BSD. |
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83 | The function |
84 | .BR _Exit () | |
85 | was introduced by C99. | |
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86 | .SH NOTES |
87 | For a discussion on the effects of an exit, the transmission of | |
078a7d6e | 88 | exit status, zombie processes, signals sent, and so on, see |
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89 | .BR exit (3). |
90 | .LP | |
91 | The function | |
63aa9df0 | 92 | .BR _exit () |
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93 | is like |
94 | .BR exit (3), | |
95 | but does not call any | |
7b57506d | 96 | functions registered with |
0bfa087b | 97 | .BR atexit (3) |
c13182ef | 98 | or |
0bfa087b | 99 | .BR on_exit (3). |
7b57506d | 100 | Whether it flushes |
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101 | standard I/O buffers and removes temporary files created with |
102 | .BR tmpfile (3) | |
a43eed0c | 103 | is implementation-dependent. |
fea681da | 104 | On the other hand, |
63aa9df0 | 105 | .BR _exit () |
fea681da | 106 | does close open file descriptors, and this may cause an unknown delay, |
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107 | waiting for pending output to finish. |
108 | If the delay is undesired, | |
988db661 | 109 | it may be useful to call functions like |
0bfa087b | 110 | .BR tcflush (3) |
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111 | before calling |
112 | .BR _exit (). | |
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113 | Whether any pending I/O is canceled, and which pending I/O may be |
114 | canceled upon | |
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115 | .BR _exit (), |
116 | is implementation-dependent. | |
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117 | |
118 | In glibc up to version 2.3, the | |
119 | .BR _exit () | |
120 | wrapper function invoked the kernel system call of the same name. | |
121 | Since glibc 2.3, the wrapper function invokes | |
122 | .BR exit_group (2), | |
123 | in order to terminate all of the threads in a process. | |
47297adb | 124 | .SH SEE ALSO |
fea681da | 125 | .BR execve (2), |
f02720dd | 126 | .BR exit_group (2), |
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127 | .BR fork (2), |
128 | .BR kill (2), | |
129 | .BR wait (2), | |
130 | .BR wait4 (2), | |
131 | .BR waitpid (2), | |
7b57506d | 132 | .BR atexit (3), |
fea681da | 133 | .BR exit (3), |
7b57506d | 134 | .BR on_exit (3), |
fea681da | 135 | .BR termios (3) |