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  5.10  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)