mirror of https://github.com/mkerrisk/man-pages
81 lines
2.9 KiB
Groff
81 lines
2.9 KiB
Groff
.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.\" References consulted:
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.\" Linux libc source code
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.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
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.\" 386BSD man pages
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.\" Modified Sun Jul 25 10:40:51 1993 by Rik Faith (faith@cs.unc.edu)
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.\" Modified Sun Apr 14 16:20:34 1996 by Andries Brouwer (aeb@cwi.nl)
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.TH SIGINTERRUPT 3 2007-07-26 "" "Linux Programmer's Manual"
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.SH NAME
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siginterrupt \- allow signals to interrupt system calls
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.SH SYNOPSIS
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.nf
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.B #include <signal.h>
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.sp
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.BI "int siginterrupt(int " sig ", int " flag );
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.fi
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.sp
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.in -4n
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.in
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.sp
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.BR siginterrupt ():
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_BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500
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.SH DESCRIPTION
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The
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.BR siginterrupt ()
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function changes the restart behavior when
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a system call is interrupted by the signal \fIsig\fP.
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If the \fIflag\fP
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argument is false (0), then system calls will be restarted if interrupted
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by the specified signal \fIsig\fP.
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This is the default behavior in Linux.
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However, when a new signal handler is specified with the
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.BR signal (2)
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function, the system call is interrupted by default.
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.PP
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If the \fIflag\fP argument is true (1) and no data has been transferred,
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then a system call interrupted by the signal \fIsig\fP will return \-1
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and the global variable \fIerrno\fP will be set to
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.BR EINTR .
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.PP
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If the \fIflag\fP argument is true (1) and data transfer has started,
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then the system call will be interrupted and will return the actual
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amount of data transferred.
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.SH "RETURN VALUE"
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The
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.BR siginterrupt ()
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function returns 0 on success, or \-1 if the
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signal number \fIsig\fP is invalid.
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.SH ERRORS
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.TP
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.B EINVAL
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The specified signal number is invalid.
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.SH "CONFORMING TO"
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4.3BSD, POSIX.1-2001.
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.\" FIXME . Mar 08: The next POSIX.1 revisions marks siginterrupt() obsolete.
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.SH "SEE ALSO"
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.BR signal (2)
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