From: H. Peter Anvin <hpa@zytor.com>
Date: Fri, 25 Aug 2006 04:04:27 +0000 (-0700)
Subject: Support building extlinux with klibc
X-Git-Tag: syslinux-3.20-pre20~1
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3c6c02ff57e3f2fd72a7ec41d8bfbf14290a7adc;p=profile%2Fivi%2Fsyslinux.git

Support building extlinux with klibc
---

diff --git a/Makefile b/Makefile
index 9c66779..dffe44c 100644
--- a/Makefile
+++ b/Makefile
@@ -255,7 +255,7 @@ depend: local-depend
 # Shortcut to build unix/syslinux using klibc
 klibc:
 	$(MAKE) clean
-	$(MAKE) CC=klcc ITARGET= ISUBDIRS=unix BSUBDIRS=
+	$(MAKE) CC=klcc ITARGET= ISUBDIRS='unix extlinux' BSUBDIRS=
 
 # Hook to add private Makefile targets for the maintainer.
 -include Makefile.private
diff --git a/NEWS b/NEWS
index 96a0638..a01b7d6 100644
--- a/NEWS
+++ b/NEWS
@@ -10,7 +10,8 @@ Changes in 3.20:
 	* New library functions to load and place files in memory.
 	* mboot.c32 bug fixes.
 	* Remove 8 MB kernel size restriction.
-	* Add "klibc" target for building unix/syslinux with klcc.
+	* Add "klibc" target for building unix/syslinux and
+	  extlinux/extlinux with klcc (klibc-1.4.25 or later.)
 	* PXELINUX: Fail (and eventually reboot) if no configuration
 	  file was found.
 	* COM32 module by Erwan Velu to make decisions based on DMI
diff --git a/extlinux/extlinux.c b/extlinux/extlinux.c
index 485c337..be0e296 100644
--- a/extlinux/extlinux.c
+++ b/extlinux/extlinux.c
@@ -25,7 +25,9 @@ typedef uint64_t u64;
 #include <fcntl.h>
 #include <stdio.h>
 #include <unistd.h>
+#ifndef __KLIBC__
 #include <mntent.h>
+#endif
 #include <stdlib.h>
 #include <string.h>
 #include <getopt.h>
@@ -646,11 +648,14 @@ already_installed(int devfd)
 int
 install_loader(const char *path, int update_only)
 {
-  struct stat st, dst, fst;
-  struct mntent *mnt = NULL;
+  struct stat st, fst;
   int devfd, rv;
-  FILE *mtab;
   const char *devname = NULL;
+#ifndef __KLIBC__
+  struct mntent *mnt = NULL;
+  struct stat dst;
+  FILE *mtab;
+#endif
 
   if ( stat(path, &st) || !S_ISDIR(st.st_mode) ) {
     fprintf(stderr, "%s: Not a directory: %s\n", program, path);
@@ -659,6 +664,27 @@ install_loader(const char *path, int update_only)
 
   devfd = -1;
 
+#ifdef __KLIBC__
+
+  /* klibc doesn't have getmntent and friends; instead, just create
+     a new device with the appropriate device type */
+  
+  {
+    static char devname_buf[64];
+
+    snprintf(devname_buf, sizeof devname_buf, "/tmp/dev-%u:%u",
+	     major(st.st_dev), minor(st.st_dev));
+    
+    if (mknod(devname_buf, 0600, st.st_dev)) {
+      fprintf(stderr, "%s: cannot create device %s\n", program, devname);
+      return 1;
+    }
+
+    devname = devname_buf;
+  }
+
+#else
+
   if ( (mtab = setmntent("/proc/mounts", "r")) ) {
     while ( (mnt = getmntent(mtab)) ) {
       if ( (!strcmp(mnt->mnt_type, "ext2") ||
@@ -687,6 +713,9 @@ install_loader(const char *path, int update_only)
   }
 
   fprintf(stderr, "%s is device %s\n", path, devname);
+
+#endif
+
   if ( (devfd = open(devname, O_RDWR|O_SYNC)) < 0 ) {
     fprintf(stderr, "%s: cannot open device %s\n", program, devname);
     return 1;
@@ -706,11 +735,15 @@ install_loader(const char *path, int update_only)
   }
 
   sync();
-  rv = install_bootblock(devfd, mnt->mnt_fsname);
+  rv = install_bootblock(devfd, devname);
   close(devfd);
   sync();
 
+#ifdef __KLIBC__
+  unlink(devname);
+#else
   endmntent(mtab);
+#endif
 
   if ( rv ) return rv;