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1 | .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
2 | .\" | |
93015253 | 3 | .\" %%%LICENSE_START(VERBATIM) |
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4 | .\" Permission is granted to make and distribute verbatim copies of this |
5 | .\" manual provided the copyright notice and this permission notice are | |
6 | .\" preserved on all copies. | |
7 | .\" | |
8 | .\" Permission is granted to copy and distribute modified versions of this | |
9 | .\" manual under the conditions for verbatim copying, provided that the | |
10 | .\" entire resulting derived work is distributed under the terms of a | |
11 | .\" permission notice identical to this one. | |
c13182ef | 12 | .\" |
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13 | .\" Since the Linux kernel and libraries are constantly changing, this |
14 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
15 | .\" responsibility for errors or omissions, or for damages resulting from | |
16 | .\" the use of the information contained herein. The author(s) may not | |
17 | .\" have taken the same level of care in the production of this manual, | |
18 | .\" which is licensed free of charge, as they might when working | |
19 | .\" professionally. | |
c13182ef | 20 | .\" |
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21 | .\" Formatted or processed versions of this manual, if unaccompanied by |
22 | .\" the source, must acknowledge the copyright and authors of this work. | |
4b72fb64 | 23 | .\" %%%LICENSE_END |
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24 | .\" |
25 | .\" References consulted: | |
26 | .\" Linux libc source code | |
27 | .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) | |
28 | .\" 386BSD man pages | |
29 | .\" Modified 1993-04-02, David Metcalfe | |
30 | .\" Modified 1993-07-25, Rik Faith (faith@cs.unc.edu) | |
1d767b55 | 31 | .TH ON_EXIT 3 2021-03-22 "GNU" "Linux Programmer's Manual" |
fea681da | 32 | .SH NAME |
027df6e0 | 33 | on_exit \- register a function to be called at normal process termination |
fea681da MK |
34 | .SH SYNOPSIS |
35 | .nf | |
36 | .B #include <stdlib.h> | |
68e4db0a | 37 | .PP |
d62694cc | 38 | .BI "int on_exit(void (*" function ")(int, void *), void *" arg ); |
fea681da | 39 | .fi |
68e4db0a | 40 | .PP |
d39ad78f | 41 | .RS -4 |
cc4615cc MK |
42 | Feature Test Macro Requirements for glibc (see |
43 | .BR feature_test_macros (7)): | |
d39ad78f | 44 | .RE |
68e4db0a | 45 | .PP |
cc4615cc | 46 | .BR on_exit (): |
9d281e06 | 47 | .nf |
51c612fb MK |
48 | Since glibc 2.19: |
49 | _DEFAULT_SOURCE | |
50 | Glibc 2.19 and earlier: | |
51 | _BSD_SOURCE || _SVID_SOURCE | |
9d281e06 | 52 | .fi |
fea681da | 53 | .SH DESCRIPTION |
60a90ecd MK |
54 | The |
55 | .BR on_exit () | |
c6fa0841 MK |
56 | function registers the given |
57 | .I function | |
58 | to be | |
027df6e0 | 59 | called at normal process termination, whether via |
fea681da | 60 | .BR exit (3) |
c6fa0841 MK |
61 | or via return from the program's |
62 | .IR main (). | |
63 | The | |
64 | .I function | |
65 | is passed the status argument given to the last call to | |
fea681da | 66 | .BR exit (3) |
c6fa0841 MK |
67 | and the |
68 | .I arg | |
69 | argument from | |
60a90ecd | 70 | .BR on_exit (). |
847e0d88 | 71 | .PP |
6a275cde MK |
72 | The same function may be registered multiple times: |
73 | it is called once for each registration. | |
847e0d88 | 74 | .PP |
36a0cc25 MK |
75 | When a child process is created via |
76 | .BR fork (2), | |
77 | it inherits copies of its parent's registrations. | |
78 | Upon a successful call to one of the | |
79 | .BR exec (3) | |
80 | functions, all registrations are removed. | |
47297adb | 81 | .SH RETURN VALUE |
60a90ecd MK |
82 | The |
83 | .BR on_exit () | |
84 | function returns the value 0 if successful; otherwise | |
c7094399 | 85 | it returns a nonzero value. |
d388b47f ZL |
86 | .SH ATTRIBUTES |
87 | For an explanation of the terms used in this section, see | |
88 | .BR attributes (7). | |
c466875e MK |
89 | .ad l |
90 | .nh | |
d388b47f ZL |
91 | .TS |
92 | allbox; | |
c466875e | 93 | lbx lb lb |
d388b47f ZL |
94 | l l l. |
95 | Interface Attribute Value | |
96 | T{ | |
97 | .BR on_exit () | |
98 | T} Thread safety MT-Safe | |
99 | .TE | |
c466875e MK |
100 | .hy |
101 | .ad | |
847e0d88 | 102 | .sp 1 |
47297adb | 103 | .SH CONFORMING TO |
a4b636a0 | 104 | This function comes from SunOS 4, but is also present in glibc. |
68e1685c | 105 | It no longer occurs in Solaris (SunOS 5). |
4ccc3a14 | 106 | Portable application should avoid this function, and use the standard |
fea681da MK |
107 | .BR atexit (3) |
108 | instead. | |
7c17e8f3 MK |
109 | .SH NOTES |
110 | By the time | |
111 | .I function | |
112 | is executed, stack | |
113 | .RI ( auto ) | |
114 | variables may already have gone out of scope. | |
115 | Therefore, | |
116 | .I arg | |
117 | should not be a pointer to a stack variable; | |
118 | it may however be a pointer to a heap variable or a global variable. | |
47297adb | 119 | .SH SEE ALSO |
c62b9eaa | 120 | .BR _exit (2), |
fea681da MK |
121 | .BR atexit (3), |
122 | .BR exit (3) |