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 <= 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 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 5.13 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/.

                                            2021-03-22                            SIGINTERRUPT(3)