traceroute: fix help text to not show -6 when traceroute6 is off

[oweals/busybox.git] / libbb / loop.c

diff --git a/libbb/loop.c b/libbb/loop.c
index 1b296d99bef969a12ff65184294705f6c0261320..3fec7ad6d876f641d691a4a44ee57cffe33e72ad 100644 (file)
--- a/libbb/loop.c
+++ b/libbb/loop.c
@@ -7,27 +7,35 @@
  *
  * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
  */
-
 #include "libbb.h"
-
-/* For 2.6, use the cleaned up header to get the 64 bit API. */
 #include <linux/version.h>
+
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
-#include <linux/loop.h>
+
+/* For 2.6, use the cleaned up header to get the 64 bit API. */
+/* linux/loop.h relies on __u64. Make sure we have that as a proper type
+ * until userspace is widely fixed. */
+# if (defined __INTEL_COMPILER && !defined __GNUC__) \
+  || (defined __GNUC__ && defined __STRICT_ANSI__)
+__extension__ typedef long long __s64;
+__extension__ typedef unsigned long long __u64;
+# endif
+# include <linux/loop.h>
 typedef struct loop_info64 bb_loop_info;
-#define BB_LOOP_SET_STATUS LOOP_SET_STATUS64
-#define BB_LOOP_GET_STATUS LOOP_GET_STATUS64
+# define BB_LOOP_SET_STATUS LOOP_SET_STATUS64
+# define BB_LOOP_GET_STATUS LOOP_GET_STATUS64
 
-/* For 2.4 and earlier, use the 32 bit API (and don't trust the headers) */
 #else
-/* Stuff stolen from linux/loop.h for 2.4 and earlier kernels*/
-#include <linux/posix_types.h>
-#define LO_NAME_SIZE        64
-#define LO_KEY_SIZE         32
-#define LOOP_SET_FD         0x4C00
-#define LOOP_CLR_FD         0x4C01
-#define BB_LOOP_SET_STATUS  0x4C02
-#define BB_LOOP_GET_STATUS  0x4C03
+
+/* For 2.4 and earlier, use the 32 bit API (and don't trust the headers) */
+/* Stuff stolen from linux/loop.h for 2.4 and earlier kernels */
+# include <linux/posix_types.h>
+# define LO_NAME_SIZE        64
+# define LO_KEY_SIZE         32
+# define LOOP_SET_FD         0x4C00
+# define LOOP_CLR_FD         0x4C01
+# define BB_LOOP_SET_STATUS  0x4C02
+# define BB_LOOP_GET_STATUS  0x4C03
 typedef struct {
        int                lo_number;
        __kernel_dev_t     lo_device;
@@ -44,7 +52,7 @@ typedef struct {
 } bb_loop_info;
 #endif
 
-char *query_loop(const char *device)
+char* FAST_FUNC query_loop(const char *device)
 {
        int fd;
        bb_loop_info loopinfo;
@@ -60,8 +68,7 @@ char *query_loop(const char *device)
        return dev;
 }
 
-
-int del_loop(const char *device)
+int FAST_FUNC del_loop(const char *device)
 {
        int fd, rc;
 
@@ -79,12 +86,13 @@ int del_loop(const char *device)
    search will re-use an existing loop device already bound to that
    file/offset if it finds one.
  */
-int set_loop(char **device, const char *file, unsigned long long offset)
+int FAST_FUNC set_loop(char **device, const char *file, unsigned long long offset)
 {
-       char dev[20], *try;
+       char dev[LOOP_NAMESIZE];
+       char *try;
        bb_loop_info loopinfo;
        struct stat statbuf;
-       int i, dfd, ffd, mode, rc=-1;
+       int i, dfd, ffd, mode, rc = -1;
 
        /* Open the file.  Barf if this doesn't work.  */
        mode = O_RDWR;
@@ -97,13 +105,13 @@ int set_loop(char **device, const char *file, unsigned long long offset)
        }
 
        /* Find a loop device.  */
-       try = *device ? : dev;
-       for (i=0;rc;i++) {
+       try = *device ? *device : dev;
+       for (i = 0; rc; i++) {
                sprintf(dev, LOOP_FORMAT, i);
 
                /* Ran out of block devices, return failure.  */
                if (stat(try, &statbuf) || !S_ISBLK(statbuf.st_mode)) {
-                       rc=-ENOENT;
+                       rc = -ENOENT;
                        break;
                }
                /* Open the sucker and check its loopiness.  */
@@ -112,19 +120,22 @@ int set_loop(char **device, const char *file, unsigned long long offset)
                        mode = O_RDONLY;
                        dfd = open(try, mode);
                }
-               if (dfd < 0) goto try_again;
+               if (dfd < 0)
+                       goto try_again;
 
                rc = ioctl(dfd, BB_LOOP_GET_STATUS, &loopinfo);
 
-               /* If device free, claim it.  */
+               /* If device is free, claim it.  */
                if (rc && errno == ENXIO) {
                        memset(&loopinfo, 0, sizeof(loopinfo));
                        safe_strncpy((char *)loopinfo.lo_file_name, file, LO_NAME_SIZE);
                        loopinfo.lo_offset = offset;
                        /* Associate free loop device with file.  */
                        if (!ioctl(dfd, LOOP_SET_FD, ffd)) {
-                               if (!ioctl(dfd, BB_LOOP_SET_STATUS, &loopinfo)) rc = 0;
-                               else ioctl(dfd, LOOP_CLR_FD, 0);
+                               if (!ioctl(dfd, BB_LOOP_SET_STATUS, &loopinfo))
+                                       rc = 0;
+                               else
+                                       ioctl(dfd, LOOP_CLR_FD, 0);
                        }
 
                /* If this block device already set up right, re-use it.
@@ -132,16 +143,19 @@ int set_loop(char **device, const char *file, unsigned long long offset)
                   file isn't pretty either.  In general, mounting the same file twice
                   without using losetup manually is problematic.)
                 */
-               } else if (strcmp(file,(char *)loopinfo.lo_file_name)
-                                       || offset!=loopinfo.lo_offset) rc = -1;
+               } else if (strcmp(file, (char *)loopinfo.lo_file_name) != 0
+               || offset != loopinfo.lo_offset) {
+                       rc = -1;
+               }
                close(dfd);
-try_again:
+ try_again:
                if (*device) break;
        }
        close(ffd);
        if (!rc) {
-               if (!*device) *device = strdup(dev);
-               return mode==O_RDONLY ? 1 : 0;
+               if (!*device)
+                       *device = xstrdup(dev);
+               return (mode == O_RDONLY); /* 1:ro, 0:rw */
        }
        return rc;
 }