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1 | .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
| 2 | .\" | |
| 3 | .\" Permission is granted to make and distribute verbatim copies of this | |
| 4 | .\" manual provided the copyright notice and this permission notice are | |
| 5 | .\" preserved on all copies. | |
| 6 | .\" | |
| 7 | .\" Permission is granted to copy and distribute modified versions of this | |
| 8 | .\" manual under the conditions for verbatim copying, provided that the | |
| 9 | .\" entire resulting derived work is distributed under the terms of a | |
| 10 | .\" permission notice identical to this one. | |
| c13182ef | 11 | .\" |
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12 | .\" Since the Linux kernel and libraries are constantly changing, this |
| 13 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
| 14 | .\" responsibility for errors or omissions, or for damages resulting from | |
| 15 | .\" the use of the information contained herein. The author(s) may not | |
| 16 | .\" have taken the same level of care in the production of this manual, | |
| 17 | .\" which is licensed free of charge, as they might when working | |
| 18 | .\" professionally. | |
| c13182ef | 19 | .\" |
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20 | .\" Formatted or processed versions of this manual, if unaccompanied by |
| 21 | .\" the source, must acknowledge the copyright and authors of this work. | |
| 22 | .\" | |
| 23 | .\" References consulted: | |
| 24 | .\" Linux libc source code | |
| 25 | .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) | |
| 26 | .\" 386BSD man pages | |
| 27 | .\" Modified Sun Jul 25 10:40:51 1993 by Rik Faith (faith@cs.unc.edu) | |
| 28 | .\" Modified Sun Apr 14 16:20:34 1996 by Andries Brouwer (aeb@cwi.nl) | |
| 29 | .TH SIGINTERRUPT 3 1993-04-13 "" "Linux Programmer's Manual" | |
| 30 | .SH NAME | |
| 31 | siginterrupt \- allow signals to interrupt system calls | |
| 32 | .SH SYNOPSIS | |
| 33 | .nf | |
| 34 | .B #include <signal.h> | |
| 35 | .sp | |
| 36 | .BI "int siginterrupt(int " sig ", int " flag ); | |
| 37 | .fi | |
| 38 | .SH DESCRIPTION | |
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39 | The |
| 40 | .BR siginterrupt () | |
| 41 | function changes the restart behaviour when | |
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42 | a system call is interrupted by the signal \fIsig\fP. |
| 43 | If the \fIflag\fP | |
| 44 | argument is false (0), then system calls will be restarted if interrupted | |
| 45 | by the specified signal \fIsig\fP. | |
| 46 | This is the default behaviour in Linux. | |
| 47 | However, when a new signal handler is specified with the | |
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48 | .BR signal (2) |
| 49 | function, the system call is interrupted by default. | |
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50 | .PP |
| 51 | If the \fIflags\fP argument is true (1) and no data has been transferred, | |
| 52 | then a system call interrupted by the signal \fIsig\fP will return \-1 | |
| 53 | and the global variable \fIerrno\fP will be set to \fBEINTR\fP. | |
| 54 | .PP | |
| 55 | If the \fIflags\fP argument is true (1) and data transfer has started, | |
| 56 | then the system call will be interrupted and will return the actual | |
| 57 | amount of data transferred. | |
| 58 | .SH "RETURN VALUE" | |
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59 | The |
| 60 | .BR siginterrupt () | |
| 61 | function returns 0 on success, or \-1 if the | |
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62 | signal number \fIsig\fP is invalid. |
| 63 | .SH ERRORS | |
| 64 | .TP | |
| 65 | .B EINVAL | |
| 66 | The specified signal number is invalid. | |
| 67 | .SH "CONFORMING TO" | |
| 68e1685c | 68 | 4.3BSD, POSIX.1-2001. |
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69 | .SH "SEE ALSO" |
| 70 | .BR signal (2) |