siginterrupt(3) — Linux manual page

siginterrupt(3)         Library Functions Manual         siginterrupt(3)

NAME

       siginterrupt - allow signals to interrupt system calls

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

       #include <signal.h>

       [[deprecated]] 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      │
       └────────────────┴───────────────┴──────────────────────────────┘

STANDARDS

       POSIX.1-2008.

HISTORY

       4.3BSD, POSIX.1-2001.  Obsolete in POSIX.1-2008, recommending the
       use of sigaction(2) with the SA_RESTART flag instead.

SEE ALSO

       signal(2)

COLOPHON

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Linux man-pages 6.9.1          2024-05-02                siginterrupt(3)

Pages that refer to this page: sigaction(2), signal(2)

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