From: Ben Gras <ben@minix3.org>
Date: Thu, 21 Jul 2005 13:17:56 +0000 (+0000)
Subject: Added dev2name - translate (minor,major) device numbers, or (minor|major<<..)
X-Git-Tag: v3.1.0~579
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/FAQ?a=commitdiff_plain;h=da9b8e45f91d99ca809ace333cb366e73973b59c;p=minix.git

Added dev2name - translate (minor,major) device numbers, or (minor|major<<..)
device number, to /dev/* node name.
---

diff --git a/commands/simple/Makefile b/commands/simple/Makefile
index ccb3905f1..1a7a06a9c 100755
--- a/commands/simple/Makefile
+++ b/commands/simple/Makefile
@@ -66,6 +66,7 @@ ALL	= \
 	date \
 	dd \
 	decomp16 \
+	dev2name \
 	df \
 	dhrystone \
 	diff \
@@ -313,6 +314,10 @@ decomp16:	decomp16.c
 	$(CCLD) -o $@ $?
 	@install -S 4kw $@
 
+dev2name:	dev2name.c
+	$(CCLD) -o $@ $?
+	@install -S 4kw $@
+
 df:	df.c
 	$(CCLD) -I$(SYS) -o $@ $?
 	@install -S 4kw $@
@@ -880,6 +885,7 @@ install:	\
 	/usr/bin/date \
 	/usr/bin/dd \
 	/usr/bin/decomp16 \
+	/bin/dev2name \
 	/usr/bin/df \
 	/usr/bin/dhrystone \
 	/usr/bin/diff \
@@ -1139,6 +1145,9 @@ install:	\
 /usr/bin/dd:	dd
 	install -cs -o bin $? $@
 
+/bin/dev2name:	dev2name
+	install -cs -o bin $? $@
+
 /usr/bin/decomp16:	decomp16
 	install -cs -o bin $? $@
 
diff --git a/commands/simple/dev2name.c b/commands/simple/dev2name.c
new file mode 100644
index 000000000..0e83357cd
--- /dev/null
+++ b/commands/simple/dev2name.c
@@ -0,0 +1,54 @@
+
+/* Translate internal FS device number to a /dev/ name. */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <dirent.h>
+#include <unistd.h>
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <minix/config.h>
+#include <minix/const.h>
+
+#define PATH_DEV "/dev"
+
+int
+main(int argc, char *argv[])
+{
+	DIR *dev;
+	struct dirent *e;
+	int dev_n;
+	if(argc <= 1 || argc > 3) {
+		fprintf(stderr, "Usage: \n"
+			"%s <major> <minor>\n"
+			"%s <devicenumber>\n", argv[0], argv[0]);
+		return 1;
+	} else if(argc == 2) dev_n = atoi(argv[1]);
+	else if(argc == 3) dev_n = (atoi(argv[1]) << MAJOR) | atoi(argv[2]);
+
+	if(chdir(PATH_DEV) < 0) {
+		perror(PATH_DEV " chdir");
+		return 1;
+	}
+
+	if(!(dev=opendir("."))) {
+		perror(". in " PATH_DEV);
+		return 1;
+	}
+
+	while((e=readdir(dev))) {
+		struct stat st;
+		if(stat(e->d_name, &st) < 0) {
+			continue;
+		}
+		if((st.st_mode & (S_IFBLK | S_IFCHR)) && dev_n == st.st_rdev) {
+			printf("%s/%s\n", PATH_DEV, e->d_name);
+			return 0;
+		}
+	}
+
+	return 1;
+}
+