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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14 | .\" manual page may be incorrect or out-of-date.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 Sun Jul 25 10:40:51 1993 by Rik Faith (faith@cs.unc.edu) | |
30 | .\" Modified Sun Apr 14 16:20:34 1996 by Andries Brouwer (aeb@cwi.nl) | |
97986708 | 31 | .TH SIGINTERRUPT 3 2016-03-15 "" "Linux Programmer's Manual" |
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32 | .SH NAME |
33 | siginterrupt \- allow signals to interrupt system calls | |
34 | .SH SYNOPSIS | |
35 | .nf | |
36 | .B #include <signal.h> | |
68e4db0a | 37 | .PP |
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38 | .BI "int siginterrupt(int " sig ", int " flag ); |
39 | .fi | |
68e4db0a | 40 | .PP |
cc4615cc MK |
41 | .in -4n |
42 | Feature Test Macro Requirements for glibc (see | |
43 | .BR feature_test_macros (7)): | |
44 | .in | |
68e4db0a | 45 | .PP |
cc4615cc | 46 | .BR siginterrupt (): |
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47 | .ad l |
48 | .RS 4 | |
d59161f9 | 49 | _XOPEN_SOURCE\ >=\ 500 |
cf7fa0a1 | 50 | .\" || _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED |
cf7fa0a1 | 51 | || /* Since glibc 2.12: */ _POSIX_C_SOURCE\ >=\ 200809L |
d59161f9 | 52 | || /* Glibc versions <= 2.19: */ _BSD_SOURCE |
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53 | .RE |
54 | .ad | |
fea681da | 55 | .SH DESCRIPTION |
60a90ecd MK |
56 | The |
57 | .BR siginterrupt () | |
d9bfdb9c | 58 | function changes the restart behavior when |
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59 | a system call is interrupted by the signal \fIsig\fP. |
60 | If the \fIflag\fP | |
61 | argument is false (0), then system calls will be restarted if interrupted | |
62 | by the specified signal \fIsig\fP. | |
d9bfdb9c | 63 | This is the default behavior in Linux. |
fea681da | 64 | .PP |
055e4eb7 | 65 | If the \fIflag\fP argument is true (1) and no data has been transferred, |
fea681da | 66 | then a system call interrupted by the signal \fIsig\fP will return \-1 |
28d03ce9 | 67 | and \fIerrno\fP will be set to |
055e4eb7 | 68 | .BR EINTR . |
fea681da | 69 | .PP |
055e4eb7 | 70 | If the \fIflag\fP argument is true (1) and data transfer has started, |
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71 | then the system call will be interrupted and will return the actual |
72 | amount of data transferred. | |
47297adb | 73 | .SH RETURN VALUE |
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74 | The |
75 | .BR siginterrupt () | |
d82911be | 76 | function returns 0 on success. |
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77 | It returns \-1 if the |
78 | signal number | |
79 | .I sig | |
80 | is invalid, with | |
81 | .I errno | |
82 | set to indicate the cause of the error. | |
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83 | .SH ERRORS |
84 | .TP | |
85 | .B EINVAL | |
86 | The specified signal number is invalid. | |
5575c22f | 87 | .SH ATTRIBUTES |
8272c761 PH |
88 | For an explanation of the terms used in this section, see |
89 | .BR attributes (7). | |
90 | .TS | |
91 | allbox; | |
92 | lb lb lb | |
93 | l l l. | |
94 | Interface Attribute Value | |
95 | T{ | |
5575c22f | 96 | .BR siginterrupt () |
abeffec2 | 97 | T} Thread safety MT-Unsafe const:sigintr |
8272c761 | 98 | .TE |
47297adb | 99 | .SH CONFORMING TO |
68e1685c | 100 | 4.3BSD, POSIX.1-2001. |
4b8234be MK |
101 | POSIX.1-2008 marks |
102 | .BR siginterrupt () | |
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103 | as obsolete, recommending the use of |
104 | .BR sigaction (2) | |
105 | with the | |
106 | .B SA_RESTART | |
107 | flag instead. | |
47297adb | 108 | .SH SEE ALSO |
fea681da | 109 | .BR signal (2) |