Open Source Software

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 4.09 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)



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