1
我遇到了一些問題，並且找不到解決方案：/我需要在我的保險絲文件系統中打開文本文件。在調試一切正常，但在發佈系統崩潰。我用這個做了一個簡單的例子。有人可以告訴這個代碼有什麼問題嗎？FUSE文件系統在打開文件時崩潰（僅在發佈模式下）
/*
FUSE: Filesystem in Userspace
Copyright (C) 2001-2007 Miklos Szeredi <[email protected]>
This program can be distributed under the terms of the GNU GPL.
See the file COPYING.
gcc -Wall `pkg-config fuse --cflags --libs` hello.c -o hello
*/
# define FUSE_USE_VERSION 26
#include <fuse.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
void stripnl(char *str) {
while(strlen(str) && ((str[strlen(str) - 1] == 13) ||
(str[strlen(str) - 1] == 10))) {
str[strlen(str) - 1] = 0;
}
}
static const char *hello_str = "Hello World!\n";
static const char *hello_path = "/hello";
static int hello_getattr(const char *path, struct stat *stbuf)
{
int res = 0;
memset(stbuf, 0, sizeof(struct stat));
if (strcmp(path, "/") == 0) {
stbuf->st_mode = S_IFDIR | 0755;
stbuf->st_nlink = 2;
} else if (strcmp(path, hello_path) == 0) {
stbuf->st_mode = S_IFREG | 0444;
stbuf->st_nlink = 1;
stbuf->st_size = strlen(hello_str);
} else
res = -ENOENT;
return res;
}
static int hello_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
off_t offset, struct fuse_file_info *fi)
{
(void) offset;
(void) fi;
if (strcmp(path, "/") != 0)
return -ENOENT;
filler(buf, ".", NULL, 0);
filler(buf, "..", NULL, 0);
filler(buf, hello_path + 1, NULL, 0);
FILE *infile;
char fname[40];
char line[100];
int lcount;
/* We need to get rid of the newline char. */
stripnl(fname);
/* Open the file. If NULL is returned there was an error */
if((infile = fopen("ex.txt", "r")) == NULL) {
printf("Error Opening File.\n");
}
while(fgets(line, sizeof(line), infile) != NULL) {
/* Get each line from the infile */
lcount++;
/* print the line number and data */
printf("Line %d: %s", lcount, line);
filler(buf, line, NULL, 0);
}
fclose(infile); /* Close the file */
return 0;
}
static int hello_open(const char *path, struct fuse_file_info *fi)
{
if (strcmp(path, hello_path) != 0)
return -ENOENT;
if ((fi->flags & 3) != O_RDONLY)
return -EACCES;
return 0;
}
static int hello_read(const char *path, char *buf, size_t size, off_t offset,
struct fuse_file_info *fi)
{
size_t len;
(void) fi;
if(strcmp(path, hello_path) != 0)
return -ENOENT;
len = strlen(hello_str);
if (offset < len) {
if (offset + size > len)
size = len - offset;
memcpy(buf, hello_str + offset, size);
} else
size = 0;
return size;
}
static struct fuse_operations hello_oper = {
.getattr = hello_getattr,
.readdir = hello_readdir,
.open = hello_open,
.read = hello_read,
};
int main(int argc, char *argv[])
{
return fuse_main(argc, argv, &hello_oper, NULL);
}
更新
好吧，我已經找到了解決辦法，路徑必須是絕對文件路徑（不知道是這是正確的句子），但這裏是示例代碼，這是在發行工作作爲以及在調試中：
/*
FUSE: Filesystem in Userspace
Copyright (C) 2001-2007 Miklos Szeredi <[email protected]>
This program can be distributed under the terms of the GNU GPL.
See the file COPYING.
gcc -Wall `pkg-config fuse --cflags --libs` hello.c -o hello
*/
# define FUSE_USE_VERSION 26
#include <fuse.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
void stripnl(char *str) {
while(strlen(str) && ((str[strlen(str) - 1] == 13) ||
(str[strlen(str) - 1] == 10))) {
str[strlen(str) - 1] = 0;
}
}
static const char *hello_str = "Hello World!\n";
static const char *hello_path = "/hello";
static int hello_getattr(const char *path, struct stat *stbuf)
{
int res = 0;
memset(stbuf, 0, sizeof(struct stat));
if (strcmp(path, "/") == 0) {
stbuf->st_mode = S_IFDIR | 0755;
stbuf->st_nlink = 2;
} else if (strcmp(path, hello_path) == 0) {
stbuf->st_mode = S_IFREG | 0444;
stbuf->st_nlink = 1;
stbuf->st_size = strlen(hello_str);
} else
res = -ENOENT;
return res;
}
static int hello_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
off_t offset, struct fuse_file_info *fi)
{
(void) offset;
(void) fi;
if (strcmp(path, "/") != 0)
return -ENOENT;
filler(buf, ".", NULL, 0);
filler(buf, "..", NULL, 0);
filler(buf, hello_path + 1, NULL, 0);
FILE *infile;
char line[100];
if((infile = fopen("/root/Desktop/fexamples/ex.txt", "rb")) == NULL)
{
return -1;
}
while(fgets(line, sizeof(line), infile) != NULL)
{
filler(buf, line, NULL, 0);
}
fclose(infile); /* Close the file */
return 0;
}
static int hello_open(const char *path, struct fuse_file_info *fi)
{
if (strcmp(path, hello_path) != 0)
return -ENOENT;
if ((fi->flags & 3) != O_RDONLY)
return -EACCES;
return 0;
}
static int hello_read(const char *path, char *buf, size_t size, off_t offset,
struct fuse_file_info *fi)
{
size_t len;
(void) fi;
if(strcmp(path, hello_path) != 0)
return -ENOENT;
len = strlen(hello_str);
if (offset < len) {
if (offset + size > len)
size = len - offset;
memcpy(buf, hello_str + offset, size);
} else
size = 0;
return size;
}
static struct fuse_operations hello_oper = {
.getattr = hello_getattr,
.readdir = hello_readdir,
.open = hello_open,
.read = hello_read,
};
int main(int argc, char *argv[])
{
return fuse_main(argc, argv, &hello_oper, NULL);
}
下次爲自己節省一些麻煩，並使用編輯器中的「{}」按鈕來設置代碼的格式。 – Mat 2011-04-01 10:06:04
好的，對不起，下次我會這樣做。 – krzysztof 2011-04-01 10:31:04
你能更具體地瞭解這次事故嗎？給回溯？將它失敗的區域擰緊？ – Mat 2011-04-01 11:00:47