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authorEric Andersen2001-02-24 19:17:07 +0000
committerEric Andersen2001-02-24 19:17:07 +0000
commitd160a27ec15b9304e6576616639f0f347022a258 (patch)
tree1732d8e76fe36c67099357c3076ceb5cc60ac084 /util-linux
parentdc12190ba258dcaa3b5758fabf0e92f8e8380b26 (diff)
downloadbusybox-d160a27ec15b9304e6576616639f0f347022a258.zip
busybox-d160a27ec15b9304e6576616639f0f347022a258.tar.gz
Stub out the syscall, not the whole application. The stubbed
out syscall sets errno properly and whines about missing kernel support. -Erik
Diffstat (limited to 'util-linux')
-rw-r--r--util-linux/pivot_root.c26
1 files changed, 18 insertions, 8 deletions
diff --git a/util-linux/pivot_root.c b/util-linux/pivot_root.c
index d34dcd7..4d7f8a3 100644
--- a/util-linux/pivot_root.c
+++ b/util-linux/pivot_root.c
@@ -3,24 +3,35 @@
* pivot_root.c - Change root file system. Based on util-linux 2.10s
*
* busyboxed by Evin Robertson
+ * pivot_root syscall stubbed by Erik Andersen, so it will compile
+ * regardless of the kernel being used.
*/
#include <stdlib.h>
#include <stdio.h>
+#include <errno.h>
#include <sys/syscall.h>
#include <linux/unistd.h>
#include "busybox.h"
#ifndef __NR_pivot_root
#warning This kernel does not support the pivot_root syscall
-#warning The pivot_root application is being stubbed out...
-int pivot_root_main(int argc, char **argv)
+#warning The pivot_root system call is being stubbed out...
+int pivot_root(const char * new_root,const char * put_old)
{
- printf("Please recompile with a kernel supporting the pivot_root syscall.\n");
- return 0;
+ /* BusyBox was compiled against a kernel that did not support
+ * the pivot_root system call. To make this application work,
+ * you will need to recompile with a kernel supporting the
+ * pivot_root system call.
+ */
+ fprintf(stderr, "\n\nTo make this application work, you will need to recompile\n");
+ fprintf(stderr, "with a kernel supporting the pivot_root system call. -Erik\n\n");
+ errno=ENOSYS;
+ return -1;
}
#else
-
static _syscall2(int,pivot_root,const char *,new_root,const char *,put_old)
+#endif
+
int pivot_root_main(int argc, char **argv)
@@ -28,13 +39,12 @@ int pivot_root_main(int argc, char **argv)
if (argc != 3)
show_usage();
- if (pivot_root(argv[1],argv[2]) < 0)
- perror_msg_and_die("pivot_root");
+ if (pivot_root(argv[1],argv[2]) < 0)
+ perror_msg_and_die("pivot_root");
return EXIT_SUCCESS;
}
-#endif
/*