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():
           _BSD_SOURCE || _XOPEN_SOURCE >= 500 ||
           _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
           || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L

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  speci-
       fied 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 4.04 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
       http://www.kernel.org/doc/man-pages/.

                                  2015-03-02                   SIGINTERRUPT(3)
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