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+'\" t
+.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.\" 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 (date) "Linux man-pages (unreleased)"
+.SH NAME
+siginterrupt \- allow signals to interrupt system calls
+.SH LIBRARY
+Standard C library
+.RI ( libc ", " \-lc )
+.SH SYNOPSIS
+.nf
+.B #include <signal.h>
+.P
+.BI "[[deprecated]] int siginterrupt(int " sig ", int " flag );
+.fi
+.P
+.RS -4
+Feature Test Macro Requirements for glibc (see
+.BR feature_test_macros (7)):
+.RE
+.P
+.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.
+.P
+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 .
+.P
+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).
+.TS
+allbox;
+lb lb lbx
+l l l.
+Interface	Attribute	Value
+T{
+.na
+.nh
+.BR siginterrupt ()
+T}	Thread safety	T{
+.na
+.nh
+MT-Unsafe const:sigintr
+T}
+.TE
+.SH STANDARDS
+POSIX.1-2008.
+.SH HISTORY
+4.3BSD, POSIX.1-2001.
+Obsolete in POSIX.1-2008,
+recommending the use of
+.BR sigaction (2)
+with the
+.B SA_RESTART
+flag instead.
+.SH SEE ALSO
+.BR signal (2)