at_quick_exit

int at_quick_exit( void (*func)(void) );

Registers the function pointed to by func to be called on quick program termination (via quick_exit).

Calling the function from several threads does not induce a data race. The implementation shall support the registration of at least 32 functions.

Parameters

Return value

​0​ if the registration succeeds, nonzero value otherwise.

Example

#include <stdlib.h>
#include <stdio.h>
 
void f1(void)
{
    puts("pushed first");
    fflush(stdout);
}
 
void f2(void)
{
    puts("pushed second");
}
 
int main(void)
{
    at_quick_exit(f1);
    at_quick_exit(f2);
    quick_exit(0);
}

pushed second
pushed first

References

• C17 standard (ISO/IEC 9899:2018):
• 7.22.4.3 The at_quick_exit function (p: 255)
• C11 standard (ISO/IEC 9899:2011):
• 7.22.4.3 The at_quick_exit function (p: 351)

See also