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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():
           _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 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
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       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)