Skip to content

@eugeneware /mmap-problem.c
Created

Embed URL

HTTPS clone URL

Subversion checkout URL

You can clone with
or
.
Download ZIP
mmap problem with vboxfs
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
int main (int argc, char *argv[])
{
struct stat sb;
off_t len;
char *p;
int fd;
if (argc < 2) {
fprintf (stderr, "usage: %s <file>\n", argv[0]);
return 1;
}
fd = open (argv[1], O_RDWR, S_IRUSR | S_IWUSR);
if (fd == -1) {
perror ("open");
return 1;
}
if (fstat (fd, &sb) == -1) {
perror ("fstat");
return 1;
}
if (!S_ISREG (sb.st_mode)) {
fprintf (stderr, "%s is not a file\n", argv[1]);
return 1;
}
p = mmap (0, sb.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (p == MAP_FAILED) {
perror ("mmap");
return 1;
}
if (close (fd) == -1) {
perror ("close");
return 1;
}
for (len = 0; len < sb.st_size; len++)
putchar (p[len]);
if (munmap (p, sb.st_size) == -1) {
perror ("munmap");
return 1;
}
return 0;
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Something went wrong with that request. Please try again.