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(): _BSD_SOURCE || _XOPEN_SOURCE >= 500

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. However, when a new signal handler is specified with the signal(2) function, the system call is interrupted by default.

If the flags argument is true (1) and no data has been transferred, then a system call interrupted by the signal sig will return -1 and the global variable errno will be set to EINTR.

If the flags 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, or -1 if the signal number sig is invalid.

ERRORS

EINVAL
    The specified signal number is invalid.

CONFORMING TO
4.3BSD, POSIX.1-2001.

SEE ALSO
signal(2)