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/* 5.t
- Write from a mmap() of the same file. (5.t)
*/
#include "aio_setup.h"
#include <sys/mman.h>
#include <errno.h>
int test_main(void)
{
int page_size = getpagesize();
#define SIZE 512
char *buf;
int rwfd;
int status = 0, res;
rwfd = open("testdir/rwfile", O_RDWR); assert(rwfd != -1);
res = ftruncate(rwfd, 512); assert(res == 0);
buf = mmap(0, page_size, PROT_READ|PROT_WRITE, MAP_SHARED, rwfd, 0);
assert(buf != (char *)-1);
status |= attempt_rw(rwfd, buf, SIZE, 0, WRITE, SIZE);
status |= attempt_rw(rwfd, buf, SIZE, 0, READ, SIZE);
res = munmap(buf, page_size); assert(res == 0);
buf = mmap(0, page_size, PROT_READ|PROT_WRITE, MAP_SHARED, rwfd, 0);
assert(buf != (char *)-1);
status |= attempt_rw(rwfd, buf, SIZE, 0, READ, SIZE);
status |= attempt_rw(rwfd, buf, SIZE, 0, WRITE, SIZE);
res = munmap(buf, page_size); assert(res == 0);
buf = mmap(0, page_size, PROT_READ, MAP_SHARED, rwfd, 0);
assert(buf != (char *)-1);
status |= attempt_rw(rwfd, buf, SIZE, 0, WRITE, SIZE);
status |= attempt_rw(rwfd, buf, SIZE, 0, READ, -EFAULT);
res = munmap(buf, page_size); assert(res == 0);
buf = mmap(0, page_size, PROT_WRITE, MAP_SHARED, rwfd, 0);
assert(buf != (char *)-1);
status |= attempt_rw(rwfd, buf, SIZE, 0, READ, SIZE);
/* Whether PROT_WRITE is readable is arch-dependent. So compare
* against read result. */
res = read(rwfd, buf, SIZE);
if (res < 0)
res = -errno;
status |= attempt_rw(rwfd, buf, SIZE, 0, WRITE, res);
return status;
}
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