X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fprocd.git;a=blobdiff_plain;f=utils%2Futils.c;h=57c82ebbd01510dbae27dfd3bd322693fdd47f49;hp=a67c00402eef435040ab85550f408a1fa97dc5dc;hb=fa5ce1c2b4fe3fa6bb4bbc6697961655b952d8d4;hpb=85633f7f50f62e824fe8b1a71db3f7508eec440b

diff --git a/utils/utils.c b/utils/utils.c
index a67c004..57c82eb 100644
--- a/utils/utils.c
+++ b/utils/utils.c
@@ -12,6 +12,7 @@
  * GNU General Public License for more details.
  */
 
+#define _GNU_SOURCE
 #include <libubox/avl.h>
 #include <libubox/avl-cmp.h>
 #include "utils.h"
@@ -20,6 +21,14 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
+#include <string.h>
+#include <errno.h>
+
+#include "../log.h"
+
+#ifndef O_PATH
+#define O_PATH		010000000
+#endif
 
 void
 __blobmsg_list_init(struct blobmsg_list *list, int offset, int len, blobmsg_list_cmp cmp)
@@ -152,3 +161,53 @@ char* get_cmdline_val(const char* name, char* out, int len)
 
 	return NULL;
 }
+
+int patch_fd(const char *device, int fd, int flags)
+{
+	int dfd, nfd;
+
+	if (device == NULL)
+		device = "/dev/null";
+
+	if (*device != '/') {
+		dfd = open("/dev", O_PATH|O_DIRECTORY);
+
+		if (dfd < 0)
+			return -1;
+
+		nfd = openat(dfd, device, flags);
+
+		close(dfd);
+	} else {
+		nfd = open(device, flags);
+	}
+
+	if (nfd < 0 && strcmp(device, "/dev/null"))
+		nfd = open("/dev/null", flags);
+
+	if (nfd < 0)
+		return -1;
+
+	fd = dup2(nfd, fd);
+
+	if (nfd > STDERR_FILENO)
+		close(nfd);
+
+	return (fd < 0) ? -1 : 0;
+}
+
+int patch_stdio(const char *device)
+{
+	int fd, rv = 0;
+	const char *fdname[3] = { "stdin", "stdout", "stderr" };
+
+	for (fd = STDIN_FILENO; fd <= STDERR_FILENO; fd++) {
+		if (patch_fd(device, fd, fd ? O_WRONLY : O_RDONLY)) {
+			ERROR("Failed to redirect %s to %s: %d (%m)\n",
+			      fdname[fd], device, errno);
+			rv = -1;
+		}
+	}
+
+	return rv;
+}