siginterrupt(3) - Linux manual page (original) (raw)

siginterrupt(3) Library Functions Manual siginterrupt(3)

NAME top

   siginterrupt - allow signals to interrupt system calls

LIBRARY top

   Standard C library (_libc_, _-lc_)

SYNOPSIS top

   **#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 top

   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](../man3/errno.3.html)_ 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 top

   The **siginterrupt**() function returns 0 on success.  It returns -1
   if the signal number _sig_ is invalid, with _[errno](../man3/errno.3.html)_ set to indicate
   the error.

ERRORS top

   **EINVAL** The specified signal number is invalid.

ATTRIBUTES top

   For an explanation of the terms used in this section, see
   [attributes(7)](../man7/attributes.7.html).
   ┌────────────────┬───────────────┬───────────────────────────────┐
   │ **Interface** │ **Attribute** │ **Value** │
   ├────────────────┼───────────────┼───────────────────────────────┤
   │ **siginterrupt**() │ Thread safety │ MT-Unsafe const:sigintr       │
   └────────────────┴───────────────┴───────────────────────────────┘

STANDARDS top

   POSIX.1-2008.

HISTORY top

   4.3BSD, POSIX.1-2001.  Obsolete in POSIX.1-2008, recommending the
   use of [sigaction(2)](../man2/sigaction.2.html) with the **SA_RESTART** flag instead.

SEE ALSO top

   [signal(2)](../man2/signal.2.html)

COLOPHON top

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Linux man-pages 6.10 2024-07-23 siginterrupt(3)

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