siginterrupt

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



NAME
       siginterrupt - allow signals to interrupt system calls

SYNOPSIS
       #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 versions <= 2.19: */ _BSD_SOURCE

DESCRIPTION
       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
       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
       EINVAL The specified signal number is invalid.

ATTRIBUTES
       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
       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
       signal(2)

COLOPHON
       This page is part of release 5.03 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/.



                                  2016-03-15                   SIGINTERRUPT(3)