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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(): _BSD_SOURCE || _XOPEN_SOURCE >= 500

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 the
       global variable 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.

SEE ALSO

       signal(2)

COLOPHON

       This  page  is  part of release 3.01 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/.

                                  2007-07-26                   SIGINTERRUPT(3)