siginterrupt(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON

SIGINTERRUPT(3)         Linux Programmer's Manual        SIGINTERRUPT(3)

NAME         top

       siginterrupt - allow signals to interrupt system calls

SYNOPSIS         top

       #include <signal.h>

       int siginterrupt(int sig, int flag);

   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

DESCRIPTION         top

       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.

RETURN VALUE         top

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

ERRORS         top

       EINVAL The specified signal number is invalid.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       attributes(7).

       ┌───────────────┬───────────────┬────────────────────────────────┐
       │Interface      Attribute     Value                          │
       ├───────────────┼───────────────┼────────────────────────────────┤
       │siginterrupt() │ Thread safety │ MT-Unsafe const:sigintr        │
       └───────────────┴───────────────┴────────────────────────────────┘

CONFORMING TO         top

       4.3BSD, POSIX.1-2001.  POSIX.1-2008 marks siginterrupt() as
       obsolete, recommending the use of sigaction(2) with the
       SA_RESTART flag instead.

SEE ALSO         top

       signal(2)

COLOPHON         top

       This page is part of release 5.13 of the Linux man-pages project.
       A description of the project, information about reporting bugs,
       and the latest version of this page, can be found at
       https://www.kernel.org/doc/man-pages/.

                               2021-03-22                SIGINTERRUPT(3)

Pages that refer to this page: sigaction(2)signal(2)