siginterrupt

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 <= 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)