siginterrupt - allow signals to interrupt system calls
int siginterrupt(int sig, int flag);
_XOPEN_SOURCE >= 500
|| /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L
|| /* Glibc <= 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
For an explanation of the terms used in this section, see attributes(7).
- The specified signal number is invalid.
4.3BSD, POSIX.1-2001. POSIX.1-2008 marks siginterrupt() as obsolete,
recommending the use of sigaction(2) with the SA_RESTART flag
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