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Register functions to be called during normal program termination
#include <stdlib.h>
int atexit( register void (*func)(void) );
- func
- A pointer to the function you want to be called when the program
terminates normally.
This function has no arguments and doesn't return a value; its prototype
should be:
void func( void );
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The atexit() function registers a function to be called
when the program terminates normally.
If you register more than one function with atexit(), they're
executed in a “last-in, first-out” order.
Normal termination occurs either by a call to
exit()
or a return from main().
You can register a total of 32 functions with atexit().
|
The functions registered with atexit() aren't called when the
program terminates with a call to
_exit(). |
0 for success, or nonzero if an error occurs.
#include <stdio.h>
#include <stdlib.h>
void func1( void )
{
printf( "last.\n" );
}
void func2( void )
{
printf( "this " );
}
void func3( void )
{
printf( "Do " );
}
int main( void )
{
atexit( func1 );
atexit( func2 );
atexit( func3 );
printf( "Do this first.\n" );
return EXIT_SUCCESS;
}
produces the output:
Do this first.
Do this last.
ANSI,
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |
abort(),
_exit(),
exit()
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