int siginterrupt(int sig, int flag);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
_BSD_SOURCE || _XOPEN_SOURCE >= 500 ||
_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
|| /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L
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 speci-
fied 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
EINVAL 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 instead.
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