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#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <signal.h>
#define FILE_SIZE 1048576
/* number of tests to run */
#define RUN_LOOP 1000
/* number of SIGBUS before exiting */
#define MAX_SIGBUS 1
static int expect_sigbus;
static int sigbus_received;
/* test for truncate()/seek()/write()/mmap()
* There should ne no SIGBUS triggered.
*/
void seek_write(char *filename)
{
int fd;
uint8_t *map;
int i;
fd = open(filename, O_RDWR|O_CREAT|O_TRUNC, 0600);
lseek(fd, FILE_SIZE - 1, SEEK_SET);
write(fd, "\xff", 1);
map = mmap(NULL, FILE_SIZE, PROT_READ, MAP_PRIVATE, fd, 0);
for (i = 0; i < (FILE_SIZE - 1); i++) {
if (map[i] != 0) /* should never be true */
abort();
}
munmap(map, FILE_SIZE);
close(fd);
}
int read_after_eof(char *filename)
{
int ret = 0;
int fd;
char *data;
uint8_t *map;
fd = open(filename, O_RDWR|O_CREAT|O_TRUNC, 0600);
lseek(fd, FILE_SIZE - 1, SEEK_SET);
write(fd, "\xff", 1);
/* trigger verify that reading after EOF fails */
ret = read(fd, data, FILE_SIZE / 2);
if (ret != 0)
return 1;
/* map an area of 1 byte after FILE_SIZE */
map = mmap(NULL, 1, PROT_READ, MAP_PRIVATE, fd, FILE_SIZE);
/* map[0] is an access after EOF, it should trigger SIGBUS */
if (map[0] != 0)
/* it is expected that we exit before we get here */
if (!sigbus_received)
return 1;
munmap(map, FILE_SIZE);
close(fd);
return ret;
}
/* signal handler for SIGBUS */
void catch_sigbus(int signum)
{
switch (signum) {
#ifdef __NetBSD__
/* Depending on architecture, we can get SIGSEGV */
case SIGSEGV: /* FALLTHROUGH */
#endif
case SIGBUS:
sigbus_received++;
if (!expect_sigbus)
exit(EXIT_FAILURE);
if (sigbus_received >= MAX_SIGBUS)
exit(EXIT_SUCCESS);
break;
default:
printf("Unexpected signal received: %d\n", signum);
}
}
int main(int argc, char **argv)
{
int i = 0;
if (argc == 1) {
printf("Usage: %s <filename>\n", argv[0]);
return EXIT_FAILURE;
}
#ifdef __NetBSD__
/* Depending on architecture, we can get SIGSEGV */
signal(SIGSEGV, catch_sigbus);
#endif
signal(SIGBUS, catch_sigbus);
/* the next test should not trigger SIGBUS */
expect_sigbus = 0;
for (i = 0; i < RUN_LOOP; i++) {
seek_write(argv[1]);
}
/* the next test should trigger SIGBUS */
expect_sigbus = 1;
if (read_after_eof(argv[1]))
return EXIT_FAILURE;
return EXIT_SUCCESS;
}
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