sig_atomic_t
From cppreference.com
C
Concurrency support (C11)
Program support utilities
Program termination
Unreachable control flow
(C23)
Communicating with the environment
(C11)
Memory alignment query
(C23)
Signals
Signal types
Non-local jumps
Types
Defined in header
<signal.h>
typedef /* unspecified */ sig_atomic_t;
An integer type which can be accessed as an atomic entity even in the presence of asynchronous interrupts made by signals.
[edit] Example
Run this code
#include <signal.h> #include <stdio.h> volatile sig_atomic_t gSignalStatus = 0; void signal_handler(int status) { gSignalStatus = status; } int main(void) { /* Install a signal handler. */ signal (SIGINT, signal_handler); printf ("SignalValue: %d\n", gSignalStatus); printf ("Sending signal: %d\n", SIGINT ); raise (SIGINT ); printf ("SignalValue: %d\n", gSignalStatus); }
Possible output:
SignalValue: 0 Sending signal: 2 SignalValue: 2
[edit] References
- C17 standard (ISO/IEC 9899:2018):
- 7.14/2 Signal handling <signal.h> (p: 194-195)
- C11 standard (ISO/IEC 9899:2011):
- 7.14/2 Signal handling <signal.h> (p: 265)
- C99 standard (ISO/IEC 9899:1999):
- 7.14/2 Signal handling <signal.h> (p: 246)
- C89/C90 standard (ISO/IEC 9899:1990):
- 4.7 SIGNAL HANDLING <signal.h>
[edit] See also
C++ documentation for sig_atomic_t