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userspace: mmap test read and write

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Mathieu Maret 2024-02-07 23:17:55 +01:00 committed by Mathieu Maret
parent 16624a0cfd
commit 91b8d48f52
1 changed files with 6 additions and 4 deletions
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10
userspace/main_user.c
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@ -56,11 +56,13 @@ int func_alloc()
return 0; return 0;
} }
int func_mmap() int func_mmap() {
{
char *path ="/dev/zero"; char *path = "/dev/zero";
mmap(0, 4096, 0, 0, path); void *mapAddr = mmap((void *)4096, 4096, PROT_READ | PROT_WRITE, 0, path);
printf("Zero mmaped at %p\n", mapAddr);
int data = *(int *)mapAddr;
*(int *)mapAddr = data;
return 0; return 0;
} }