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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():

           Since glibc 2.12
               _BSD_SOURCE || _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE &&
               _XOPEN_SOURCE_EXTENDED || _POSIX_C_SOURCE >= 200809L ||
               _XOPEN_SOURCE >= 700

           Before glibc 2.12
               _BSD_SOURCE || _XOPEN_SOURCE >= 500 ||
               _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED

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.  However,
       when a new signal handler is specified with the signal(2) function, the
       system call is interrupted by default.

       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, or -1 if the signal
       number sig is invalid.

ERRORS

       EINVAL The specified signal number is invalid.

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 3.27 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

                                  2010-09-20                   SIGINTERRUPT(3)