siginterrupt(3) — Linux manual page


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)):

           _XOPEN_SOURCE >= 500
               || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L
               || /* Glibc versions <= 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
       cause of the error.

ERRORS         top

       EINVAL The specified signal number is invalid.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see

       │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

SEE ALSO         top


COLOPHON         top

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       latest version of this page, can be found at

                                 2016-03-15                  SIGINTERRUPT(3)

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