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Deallocate a block of memory
#include <stdlib.h>
void free( void* ptr );
- ptr
- A pointer to the block of memory that you want to free.
It's safe to call free() with a NULL pointer.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The free() function deallocates the memory block specified by
ptr, which was previously returned by a call to
calloc(),
malloc() or
realloc().
#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
int main( void )
{
char *buffer;
buffer = (char *)malloc( 80 );
if( buffer == NULL ) {
printf( "Unable to allocate memory\n" );
return EXIT_FAILURE;
} else {
/* rest of code goes here */
free( buffer ); /* deallocate buffer */
}
return EXIT_SUCCESS;
}
ANSI,
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |
Calling free() on a pointer already deallocated by a call to
free() or realloc() could corrupt the memory
allocator's data structures.
alloca(),
calloc(),
malloc(),
realloc(),
sbrk()
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