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#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <sys/mman.h>
#include "zdtmtst.h"
const char *test_doc = "Test mmaped and unlinked files";
char *filename;
TEST_OPTION(filename, string, "file name", 1);
#ifndef PAGE_SIZE
#define PAGE_SIZE 4096
#endif
static void touch_file_page(int fd, unsigned long off, char c)
{
if (lseek(fd, off, SEEK_SET) != off) {
pr_perror("Lseek fail");
exit(1);
}
if (write(fd, &c, 1) != 1) {
pr_perror("Write fail");
exit(1);
}
}
int main(int argc, char ** argv)
{
int fd;
char *mem_a, *mem_b;
test_init(argc, argv);
fd = open(filename, O_RDWR | O_CREAT | O_TRUNC, 0644);
if (fd < 0) {
pr_perror("can't open file");
exit(1);
}
touch_file_page(fd, 0, 'a');
touch_file_page(fd, PAGE_SIZE, 'b');
touch_file_page(fd, 2 * PAGE_SIZE - 1, 'c'); /* for aligned file */
/* map with different prots to create 2 regions */
mem_a = mmap(NULL, PAGE_SIZE, PROT_READ, MAP_PRIVATE | MAP_FILE, fd, 0);
mem_b = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FILE, fd, PAGE_SIZE);
if (mem_a == MAP_FAILED || mem_b == MAP_FAILED) {
pr_perror("can't map file");
exit(1);
}
if (unlink(filename) < 0) {
pr_perror("can't unlink file");
exit(1);
}
close(fd);
test_daemon();
test_waitsig();
if (mem_a[0] != 'a')
fail("1st region fail");
else if (mem_b[0] != 'b' || mem_b[PAGE_SIZE - 1] != 'c')
fail("2nd regin fail");
else
pass();
return 0;
}
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