- /* Detach by becoming the new process group leader */
-
- if(setsid() < 0)
- {
- perror("setsid");
- return -1;
- }
-
- /* Change working directory to the root (to avoid keeping mount points busy) */
-
- if(!nochdir)
- {
- chdir("/");
- }
-
- /* Redirect stdin/out/err to /dev/null */
-
- if(!noclose)
- {
- fd = open("/dev/null", O_RDWR);
-
- if(fd < 0)
- {
- perror("opening /dev/null");
- return -1;
- }
- else
- {
- dup2(fd, 0);
- dup2(fd, 1);
- dup2(fd, 2);
- }
- }
+#ifndef HAVE_GET_CURRENT_DIR_NAME
+/*
+ Replacement for the GNU get_current_dir_name function:
+
+ get_current_dir_name will malloc(3) an array big enough to hold the
+ current directory name. If the environment variable PWD is set, and
+ its value is correct, then that value will be returned.
+*/
+char *get_current_dir_name(void)
+{
+ size_t size;
+ char *buf;
+ char *r;
+
+ /* Start with 100 bytes. If this turns out to be insufficient to
+ contain the working directory, double the size. */
+ size = 100;
+ buf = xmalloc(size);
+
+ errno = 0; /* Success */
+ r = getcwd(buf, size);
+
+ /* getcwd returns NULL and sets errno to ERANGE if the bufferspace
+ is insufficient to contain the entire working directory. */
+ while(r == NULL && errno == ERANGE) {
+ free(buf);
+ size <<= 1; /* double the size */
+ buf = xmalloc(size);
+ r = getcwd(buf, size);
+ }
+
+ return buf;