sig_atomic_t

sig_atomic_t

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

#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 (p: 265)

C99 standard (ISO/IEC 9899:1999):

• 7.14/2 Signal handling (p: 246)

C89/C90 standard (ISO/IEC 9899:1990):

• 4.7 SIGNAL HANDLING

See also

signal

sets a signal handler for particular signal (function)

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