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Linux/tools/lib/api/fs/debugfs.c

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  1 #define _GNU_SOURCE
  2 #include <errno.h>
  3 #include <stdio.h>
  4 #include <stdlib.h>
  5 #include <string.h>
  6 #include <unistd.h>
  7 #include <stdbool.h>
  8 #include <sys/vfs.h>
  9 #include <sys/types.h>
 10 #include <sys/stat.h>
 11 #include <sys/mount.h>
 12 #include <linux/kernel.h>
 13 
 14 #include "debugfs.h"
 15 
 16 #ifndef DEBUGFS_DEFAULT_PATH
 17 #define DEBUGFS_DEFAULT_PATH            "/sys/kernel/debug"
 18 #endif
 19 
 20 char debugfs_mountpoint[PATH_MAX + 1] = DEBUGFS_DEFAULT_PATH;
 21 
 22 static const char * const debugfs_known_mountpoints[] = {
 23         DEBUGFS_DEFAULT_PATH,
 24         "/debug",
 25         0,
 26 };
 27 
 28 static bool debugfs_found;
 29 
 30 bool debugfs_configured(void)
 31 {
 32         return debugfs_find_mountpoint() != NULL;
 33 }
 34 
 35 /* find the path to the mounted debugfs */
 36 const char *debugfs_find_mountpoint(void)
 37 {
 38         const char *ret;
 39 
 40         if (debugfs_found)
 41                 return (const char *)debugfs_mountpoint;
 42 
 43         ret = find_mountpoint("debugfs", (long) DEBUGFS_MAGIC,
 44                               debugfs_mountpoint, PATH_MAX + 1,
 45                               debugfs_known_mountpoints);
 46         if (ret)
 47                 debugfs_found = true;
 48 
 49         return ret;
 50 }
 51 
 52 /* mount the debugfs somewhere if it's not mounted */
 53 char *debugfs_mount(const char *mountpoint)
 54 {
 55         /* see if it's already mounted */
 56         if (debugfs_find_mountpoint())
 57                 goto out;
 58 
 59         /* if not mounted and no argument */
 60         if (mountpoint == NULL) {
 61                 /* see if environment variable set */
 62                 mountpoint = getenv(PERF_DEBUGFS_ENVIRONMENT);
 63                 /* if no environment variable, use default */
 64                 if (mountpoint == NULL)
 65                         mountpoint = DEBUGFS_DEFAULT_PATH;
 66         }
 67 
 68         if (mount(NULL, mountpoint, "debugfs", 0, NULL) < 0)
 69                 return NULL;
 70 
 71         /* save the mountpoint */
 72         debugfs_found = true;
 73         strncpy(debugfs_mountpoint, mountpoint, sizeof(debugfs_mountpoint));
 74 out:
 75         return debugfs_mountpoint;
 76 }
 77 
 78 int debugfs__strerror_open(int err, char *buf, size_t size, const char *filename)
 79 {
 80         char sbuf[128];
 81 
 82         switch (err) {
 83         case ENOENT:
 84                 if (debugfs_found) {
 85                         snprintf(buf, size,
 86                                  "Error:\tFile %s/%s not found.\n"
 87                                  "Hint:\tPerhaps this kernel misses some CONFIG_ setting to enable this feature?.\n",
 88                                  debugfs_mountpoint, filename);
 89                         break;
 90                 }
 91                 snprintf(buf, size, "%s",
 92                          "Error:\tUnable to find debugfs\n"
 93                          "Hint:\tWas your kernel compiled with debugfs support?\n"
 94                          "Hint:\tIs the debugfs filesystem mounted?\n"
 95                          "Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'");
 96                 break;
 97         case EACCES:
 98                 snprintf(buf, size,
 99                          "Error:\tNo permissions to read %s/%s\n"
100                          "Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n",
101                          debugfs_mountpoint, filename, debugfs_mountpoint);
102                 break;
103         default:
104                 snprintf(buf, size, "%s", strerror_r(err, sbuf, sizeof(sbuf)));
105                 break;
106         }
107 
108         return 0;
109 }
110 
111 int debugfs__strerror_open_tp(int err, char *buf, size_t size, const char *sys, const char *name)
112 {
113         char path[PATH_MAX];
114 
115         snprintf(path, PATH_MAX, "tracing/events/%s/%s", sys, name ?: "*");
116 
117         return debugfs__strerror_open(err, buf, size, path);
118 }
119 

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