| .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
| .\" |
| .\" %%%LICENSE_START(VERBATIM) |
| .\" Permission is granted to make and distribute verbatim copies of this |
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| .\" Permission is granted to copy and distribute modified versions of this |
| .\" manual under the conditions for verbatim copying, provided that the |
| .\" entire resulting derived work is distributed under the terms of a |
| .\" permission notice identical to this one. |
| .\" |
| .\" Since the Linux kernel and libraries are constantly changing, this |
| .\" manual page may be incorrect or out-of-date. The author(s) assume no |
| .\" responsibility for errors or omissions, or for damages resulting from |
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| .\" Formatted or processed versions of this manual, if unaccompanied by |
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| .\" References consulted: |
| .\" Linux libc source code |
| .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) |
| .\" 386BSD man pages |
| .\" Modified Sun Jul 25 10:40:51 1993 by Rik Faith (faith@cs.unc.edu) |
| .\" Modified Sun Apr 14 16:20:34 1996 by Andries Brouwer (aeb@cwi.nl) |
| .TH SIGINTERRUPT 3 2021-03-22 "" "Linux Programmer's Manual" |
| .SH NAME |
| siginterrupt \- allow signals to interrupt system calls |
| .SH SYNOPSIS |
| .nf |
| .B #include <signal.h> |
| .PP |
| .BI "int siginterrupt(int " sig ", int " flag ); |
| .fi |
| .PP |
| .RS -4 |
| Feature Test Macro Requirements for glibc (see |
| .BR feature_test_macros (7)): |
| .RE |
| .PP |
| .BR siginterrupt (): |
| .nf |
| _XOPEN_SOURCE >= 500 |
| .\" || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED |
| || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L |
| || /* Glibc <= 2.19: */ _BSD_SOURCE |
| .fi |
| .SH DESCRIPTION |
| The |
| .BR siginterrupt () |
| function changes the restart behavior when |
| a system call is interrupted by the signal \fIsig\fP. |
| If the \fIflag\fP |
| argument is false (0), then system calls will be restarted if interrupted |
| by the specified signal \fIsig\fP. |
| This is the default behavior in Linux. |
| .PP |
| If the \fIflag\fP argument is true (1) and no data has been transferred, |
| then a system call interrupted by the signal \fIsig\fP will return \-1 |
| and \fIerrno\fP will be set to |
| .BR EINTR . |
| .PP |
| If the \fIflag\fP argument is true (1) and data transfer has started, |
| then the system call will be interrupted and will return the actual |
| amount of data transferred. |
| .SH RETURN VALUE |
| The |
| .BR siginterrupt () |
| function returns 0 on success. |
| It returns \-1 if the |
| signal number |
| .I sig |
| is invalid, with |
| .I errno |
| set to indicate the error. |
| .SH ERRORS |
| .TP |
| .B EINVAL |
| The specified signal number is invalid. |
| .SH ATTRIBUTES |
| For an explanation of the terms used in this section, see |
| .BR attributes (7). |
| .ad l |
| .nh |
| .TS |
| allbox; |
| lb lb lbx |
| l l l. |
| Interface Attribute Value |
| T{ |
| .BR siginterrupt () |
| T} Thread safety T{ |
| MT-Unsafe const:sigintr |
| T} |
| .TE |
| .hy |
| .ad |
| .sp 1 |
| .SH CONFORMING TO |
| 4.3BSD, POSIX.1-2001. |
| POSIX.1-2008 marks |
| .BR siginterrupt () |
| as obsolete, recommending the use of |
| .BR sigaction (2) |
| with the |
| .B SA_RESTART |
| flag instead. |
| .SH SEE ALSO |
| .BR signal (2) |
