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#include <fcntl.h>
#include <unistd.h>
#include <sys/uio.h>
#include <assert.h>
int
main(void)
{
const off_t offset = 0xdefaceddeadbeefLL;
int fd;
char buf[4];
struct iovec iov = { buf, sizeof buf };
assert((fd = open("/dev/zero", O_RDONLY)) >= 0);
assert(pread(fd, buf, sizeof buf, offset) == 4);
assert(preadv(fd, &iov, 1, offset) == 4);
assert(!close(fd));
assert((fd = open("/dev/null", O_WRONLY)) >= 0);
assert(pwrite(fd, buf, sizeof buf, offset) == 4);
assert(pwritev(fd, &iov, 1, offset) == 4);
assert(!close(fd));
return 0;
}
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