siginterrupt - allow signals to interrupt system calls

       For an explanation of the terms used in this section, see attributes(7).
       ┌────────────────┬───────────────┬──────────────────────────────────────────────────────────────────────┐
       │ Interface      │ Attribute     │ Value                                                                │
       ├────────────────┼───────────────┼──────────────────────────────────────────────────────────────────────┤
       │ siginterrupt() │ Thread safety │ MT-Unsafe const:sigintr                                              │
       └────────────────┴───────────────┴──────────────────────────────────────────────────────────────────────┘

       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.

EINVAL The specified signal number is invalid.

       4.3BSD, POSIX.1-2001.  Obsolete in POSIX.1-2008, recommending the use of sigaction(2) with the SA_RESTART
       flag instead.

       Standard C library (libc, -lc)

       siginterrupt - allow signals to interrupt system calls

       The  siginterrupt()  function  returns  0 on success.  It returns -1 if the signal number sig is invalid,
       with errno set to indicate the error.

signal(2)

Linux man-pages 6.9.1                              2024-05-02                                    siginterrupt(3)

       POSIX.1-2008.

#include<signal.h>[[deprecated]]intsiginterrupt(intsig,intflag);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       siginterrupt():
           _XOPEN_SOURCE >= 500
               || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L
               || /* glibc <= 2.19: */ _BSD_SOURCE