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siginterrupt(3)

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  attrib‐
       utes(7).   allbox; lb lb lb l l l.  Interface Attribute Value T{ sigin‐
       terrupt() T}   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 5.02 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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