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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 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
           || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L

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,  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 3.35 of the Linux man-pages project.  A description of the
       project, and information about reporting bugs, can be found at  http://man7.org/linux/man-
       pages/.

                                            2011-09-09                            SIGINTERRUPT(3)