SIGINTERRUPT(3) Linux Programmers Manual SIGINTERRUPT(3)
siginterrupt - allow signals to interrupt system calls
int siginterrupt(int sig, int flag);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
siginterrupt(): _BSD_SOURCE || _XOPEN_SOURCE >= 500
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. However, when
a new signal handler is specified with the signal(2) function, the sys
tem call is interrupted by default.
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 the
global variable 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, or -1 if the signal
number sig is invalid.
EINVAL The specified signal number is invalid.
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