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// SPDX-License-Identifier: BSL-1.0
// This is a very simple fuse based file system to cause sigbus when memory mapping the always_eio file
// and reading from the resulting memory.
// compile with gcc -o fusefault fusefault.c $(pkg-config --cflags --libs fuse) -Wall -Wextra -Werror
// mount with mkdir faultfs; ./fusefault faultfs
#include <errno.h>
#include <string.h>
#define FUSE_USE_VERSION 26
#include <fuse.h>
int fault_getattr(const char *path, struct stat *s) {
if (strcmp(path, "/") == 0) {
s->st_mode = S_IFDIR | 0755;
s->st_nlink = 2;
} else {
s->st_mode = S_IFREG | 0444;
s->st_nlink = 1;
s->st_size = 1;
}
return 0;
}
int fault_open(const char *path, struct fuse_file_info *info) {
(void)info;
if (strcmp(path, "/always_eio") == 0) {
return 0;
}
return -ENOENT;
}
int fault_read(const char *path, char *buf, size_t size, off_t offset, struct fuse_file_info *info) {
(void)path; (void)buf; (void)size; (void)offset; (void)info;
return -EIO;
}
int fault_readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset,
struct fuse_file_info *info) {
(void)path; (void)offset; (void)info;
filler(buf, ".", NULL, 0);
filler(buf, "..", NULL, 0);
filler(buf, "always_eio", NULL, 0);
return 0;
}
static struct fuse_operations fault_ops = {
.getattr = fault_getattr,
.open = fault_open,
.read = fault_read,
.readdir = fault_readdir,
};
int main(int argc, char *argv[]) {
return fuse_main(argc, argv, &fault_ops, NULL);
}
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