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/* The mmap test is useful, since syscalls with 6 arguments
* (as mmap) are done differently on various architectures.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/mman.h>
#define SIZEOF_ARRAY(type) (sizeof(type)/sizeof(*type))
struct mmap_test {
void *ret;
int err;
struct {
void *start;
size_t length;
int prot;
int flags;
int fd;
off_t offset;
} args;
};
struct mmap_test tests[] = {
[0] {
.err = 0,
.args.start = NULL,
.args.length = 4096,
.args.prot = PROT_READ|PROT_WRITE,
.args.flags = MAP_PRIVATE|MAP_ANONYMOUS,
.args.fd = 0,
.args.offset = 0
},
};
#define err(fmt, args...) \
do { \
fprintf(stderr, fmt "\n" , ## args); \
exit(1); \
} while (0)
#define errp(fmt, args...) err(fmt ": %s" , ## args , strerror(errno))
int main(int argc, char **argv)
{
int i;
struct mmap_test *t;
for (i=0; i<SIZEOF_ARRAY(tests); ++i) {
t = tests + i;
errno = 0;
t->ret = mmap(t->args.start, t->args.length, t->args.prot,
t->args.flags, t->args.fd, t->args.offset);
if (t->err) {
if (t->ret != MAP_FAILED)
err("mmap test %i should have failed, but gave us %p", i, t->ret);
else if (t->err != errno)
errp("mmap test %i failed, but gave us wrong errno (got %i instead of %i)", i, errno, t->err);
} else {
if (t->ret == MAP_FAILED)
errp("mmap test %i failed", i);
else if (munmap(t->ret, t->args.length) != 0)
errp("munmap test %i failed", i);
}
}
exit(0);
}
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