siginterrupt - allow signals to interrupt system calls
#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
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.
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.
The specified signal number is invalid.
For an explanation of the terms used in this section, see attributes(7).
Interface | Attribute | Value |
siginterrupt() | Thread safety | MT-Unsafe const:sigintr |
4.3BSD, POSIX.1-2001. POSIX.1-2008 marks siginterrupt() as obsolete, recommending the use of sigaction(2) with the SA_RESTART flag instead.
signal(2)
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