/*
dropin.c -- a set of drop-in replacements for libc functions
- Copyright (C) 2000,2001 Ivo Timmermans <itimmermans@bigfoot.com>,
- 2000,2001 Guus Sliepen <guus@sliepen.warande.net>
+ Copyright (C) 2000-2005 Ivo Timmermans,
+ 2000-2009 Guus Sliepen <guus@tinc-vpn.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id: dropin.c,v 1.1.2.9 2002/06/09 15:26:10 zarq Exp $
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#include "config.h"
-
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdarg.h>
-
-#include <xalloc.h>
+#include "system.h"
-#include <system.h>
-#include <errno.h>
-
-#include "fake-getnameinfo.c"
+#include "xalloc.h"
#ifndef HAVE_DAEMON
/*
Unless the argument noclose is non-zero, daemon() will redirect
standard input, standard output and standard error to /dev/null.
*/
-int daemon(int nochdir, int noclose)
-{
- pid_t pid;
- int fd;
-
- pid = fork();
-
- /* Check if forking failed */
- if(pid < 0)
- {
- perror("fork");
- exit(-1);
- }
-
- /* If we are the parent, terminate */
- if(pid)
- exit(0);
-
- /* 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);
- }
- }
-
- return 0;
+int daemon(int nochdir, int noclose) {
+#ifdef HAVE_FORK
+ pid_t pid;
+ int fd;
+
+ pid = fork();
+
+ /* Check if forking failed */
+ if(pid < 0) {
+ perror("fork");
+ exit(-1);
+ }
+
+ /* If we are the parent, terminate */
+ if(pid)
+ exit(0);
+
+ /* 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);
+ }
+ }
+
+ return 0;
+#else
+ return -1;
+#endif
}
#endif
-
-
-
#ifndef HAVE_GET_CURRENT_DIR_NAME
/*
Replacement for the GNU get_current_dir_name function:
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;
+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;
}
#endif
#ifndef HAVE_ASPRINTF
-int asprintf(char **buf, const char *fmt, ...)
-{
- int status;
- va_list ap;
- int len;
-
- len = 4096;
- *buf = xmalloc(len);
+int asprintf(char **buf, const char *fmt, ...) {
+ int result;
+ va_list ap;
+ va_start(ap, fmt);
+ result = vasprintf(buf, fmt, ap);
+ va_end(ap);
+ return result;
+}
+
+int vasprintf(char **buf, const char *fmt, va_list ap) {
+ int status;
+ va_list aq;
+ int len;
+
+ len = 4096;
+ *buf = xmalloc(len);
+
+ va_copy(aq, ap);
+ status = vsnprintf(*buf, len, fmt, aq);
+ va_end(aq);
- va_start(ap, fmt);
- status = vsnprintf (*buf, len, fmt, ap);
- va_end (ap);
+ if(status >= 0)
+ *buf = xrealloc(*buf, status + 1);
- if(status >= 0)
- *buf = xrealloc(*buf, status);
+ if(status > len - 1) {
+ len = status;
+ va_copy(aq, ap);
+ status = vsnprintf(*buf, len, fmt, aq);
+ va_end(aq);
+ }
- if(status > len-1)
- {
- len = status;
- va_start(ap, fmt);
- status = vsnprintf (*buf, len, fmt, ap);
- va_end (ap);
- }
+ return status;
+}
+#endif
+
+#ifndef HAVE_GETTIMEOFDAY
+int gettimeofday(struct timeval *tv, void *tz) {
+ tv->tv_sec = time(NULL);
+ tv->tv_usec = 0;
+ return 0;
+}
+#endif
- return status;
+#ifndef HAVE_USLEEP
+int usleep(long usec) {
+ struct timeval tv = {usec / 1000000, (usec / 1000) % 1000};
+ select(0, NULL, NULL, NULL, &tv);
+ return 0;
}
#endif
projects / oweals / tinc.git / blobdiff