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

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 3.25 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/.



                                                           2009-03-15                                            SIGINTERRUPT(3)