# sig_atomic_t

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< c‎ | program

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.

### Example

Run this code

    #include <signal.h>
    #include <stdio.h>

    volatile sig_atomic_t gSignalStatus = 0;

    void signal_handler(int signal)
    {
        gSignalStatus = signal;
    }

    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

### References

- 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>

### See also

signal | sets a signal handler for particular signal (function)
C++ documentation for sig_atomic_t

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