1 files changed, 154 insertions, 0 deletions
diff --git a/lib/helper.c b/lib/helper.c
new file mode 100644
index 0000000..f4a8a16
--- /dev/null
+++ b/lib/helper.c
@@ -0,0 +1,154 @@
+/*
+    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);
+}
+