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/*
FUSE: Filesystem in Userspace
Copyright (C) 2001 Miklos Szeredi (mszeredi@inf.bme.hu)
This program can be distributed under the terms of the GNU GPL.
See the file COPYING.
*/
#include "fuse.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <signal.h>
#include <errno.h>
#define FUSE_MOUNTED_ENV "_FUSE_MOUNTED"
#define FUSE_UMOUNT_CMD_ENV "_FUSE_UNMOUNT_CMD"
static void usage(char *progname)
{
fprintf(stderr,
"usage: %s mountpoint [options] \n"
"Options:\n"
" -d enable debug output\n"
" -s disable multithreaded operation\n"
" -h print help\n",
progname);
exit(1);
}
static void fuse_unmount()
{
close(0);
system(getenv(FUSE_UMOUNT_CMD_ENV));
}
static int fuse_mount(int *argcp, char **argv)
{
char *isreexec = getenv(FUSE_MOUNTED_ENV);
if(isreexec == NULL) {
int i;
int argc = *argcp;
char *mountprog = "fusermount";
char **newargv = (char **) malloc((1 + argc + 1) * sizeof(char *));
if(argc < 2 || argv[1][0] == '-')
usage(argv[0]);
/* oldargs: "PROG MOUNTPOINT ARGS..."
newargs: "fusermount MOUNTPOINT PROG ARGS..." */
newargv[0] = mountprog;
newargv[1] = argv[1];
newargv[2] = argv[0];
for(i = 2; i < argc; i++)
newargv[i+1] = argv[i];
newargv[i+1] = NULL;
execvp(mountprog, newargv);
fprintf(stderr, "fuse: failed to exec %s: %s\n", mountprog,
strerror(errno));
return -1;
}
unsetenv(FUSE_MOUNTED_ENV);
/* The actual file descriptor is stdin */
return 0;
}
static void exit_handler()
{
exit(0);
}
static void set_signal_handlers()
{
struct sigaction sa;
sa.sa_handler = exit_handler;
sigemptyset(&(sa.sa_mask));
sa.sa_flags = 0;
if (sigaction(SIGHUP, &sa, NULL) == -1 ||
sigaction(SIGINT, &sa, NULL) == -1 ||
sigaction(SIGTERM, &sa, NULL) == -1) {
perror("Cannot set exit signal handlers");
exit(1);
}
sa.sa_handler = SIG_IGN;
if(sigaction(SIGPIPE, &sa, NULL) == -1) {
perror("Cannot set ignored signals");
exit(1);
}
}
void fuse_main(int argc, char *argv[], const struct fuse_operations *op)
{
int fd;
int argctr;
int flags;
int multithreaded;
struct fuse *fuse;
fd = fuse_mount(&argc, argv);
if(fd == -1)
exit(1);
atexit(fuse_unmount);
set_signal_handlers();
argctr = 1;
flags = 0;
multithreaded = 1;
for(; argctr < argc && argv[argctr][0] == '-'; argctr ++) {
switch(argv[argctr][1]) {
case 'd':
flags |= FUSE_DEBUG;
break;
case 's':
multithreaded = 0;
break;
case 'h':
usage(argv[0]);
break;
default:
fprintf(stderr, "invalid option: %s\n", argv[argctr]);
exit(1);
}
}
if(argctr != argc) {
fprintf(stderr, "missing or surplus argument\n");
exit(1);
}
fuse = fuse_new(fd, flags);
fuse_set_operations(fuse, op);
if(multithreaded)
fuse_loop_mt(fuse);
else
fuse_loop(fuse);
}
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