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siginterrupt(3) [bsd man page]

SIGINTERRUPT(3) 					     Library Functions Manual						   SIGINTERRUPT(3)

NAME
siginterrupt - allow signals to interrupt system calls SYNOPSIS
siginterrupt(sig, flag); int sig, flag; DESCRIPTION
Siginterrupt is used to change the system call restart behavior when a system call is interrupted by the specified signal. If the flag is false (0), then system calls will be restarted if they are interrupted by the specified signal and no data has been transferred yet. Sys- tem call restart is the default behavior on 4.2 BSD. If the flag is true (1), then restarting of system calls is disabled. If a system call is interrupted by the specified signal and no data has been transferred, the system call will return -1 with errno set to EINTR. Interrupted system calls that have started transferring data will return the amount of data actually transferred. System call interrupt is the signal behavior found on 4.1 BSD and AT&T System V UNIX systems. Note that the new 4.2 BSD signal handling semantics are not altered in any other way. Most notably, signal handlers always remain installed until explicitly changed by a subsequent sigvec(2) call, and the signal mask operates as documented in sigvec(2). Programs may switch between restartable and interruptible system call operation as often as desired in the execution of a program. Issuing a siginterrupt(3) call during the execution of a signal handler will cause the new action to take place on the next signal to be caught. NOTES
This library routine uses an extension of the sigvec(2) system call that is not available in 4.2BSD, hence it should not be used if back- ward compatibility is needed. RETURN VALUE
A 0 value indicates that the call succeeded. A -1 value indicates that an invalid signal number has been supplied. SEE ALSO
sigvec(2), sigblock(2), sigpause(2), sigsetmask(2). 4.3 Berkeley Distribution May 15, 1985 SIGINTERRUPT(3)

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SIGINTERRUPT(3) 					     Linux Programmer's Manual						   SIGINTERRUPT(3)

NAME
siginterrupt - allow signals to interrupt system calls SYNOPSIS
#include <signal.h> int siginterrupt(int sig, int flag); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): siginterrupt(): _XOPEN_SOURCE >= 500 || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L || /* Glibc versions <= 2.19: */ _BSD_SOURCE DESCRIPTION
The siginterrupt() function changes the restart behavior when a system call is interrupted by the signal sig. If the flag argument is false (0), then system calls will be restarted if interrupted by the specified signal sig. This is the default behavior in Linux. If the flag argument is true (1) and no data has been transferred, then a system call interrupted by the signal sig will return -1 and errno will be set to EINTR. If the flag 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. RETURN VALUE
The siginterrupt() function returns 0 on success. It returns -1 if the signal number sig is invalid, with errno set to indicate the cause of the error. ERRORS
EINVAL The specified signal number is invalid. ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +---------------+---------------+-------------------------+ |Interface | Attribute | Value | +---------------+---------------+-------------------------+ |siginterrupt() | Thread safety | MT-Unsafe const:sigintr | +---------------+---------------+-------------------------+ CONFORMING TO
4.3BSD, POSIX.1-2001. POSIX.1-2008 marks siginterrupt() as obsolete, recommending the use of sigaction(2) with the SA_RESTART flag instead. SEE ALSO
signal(2) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. 2016-03-15 SIGINTERRUPT(3)
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