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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179// SPDX-License-Identifier: GPL-2.0#ifndef _GNU_SOURCE# define _GNU_SOURCE#endif
#include <stdio.h>#include <stdlib.h>#include <string.h>#include <linux/string.h>#include <errno.h>#include <unistd.h>#include "fs.h"
#include "tracing_path.h"
static char tracing_path[PATH_MAX] = "/sys/kernel/tracing";
static void __tracing_path_set(const char *tracing, const char *mountpoint){ snprintf(tracing_path, sizeof(tracing_path), "%s/%s", mountpoint, tracing);}
static const char *tracing_path_tracefs_mount(void){ const char *mnt;
mnt = tracefs__mount(); if (!mnt) return NULL;
__tracing_path_set("", mnt);
return tracing_path;}
static const char *tracing_path_debugfs_mount(void){ const char *mnt;
mnt = debugfs__mount(); if (!mnt) return NULL;
__tracing_path_set("tracing/", mnt);
return tracing_path;}
const char *tracing_path_mount(void){ const char *mnt;
mnt = tracing_path_tracefs_mount(); if (mnt) return mnt;
mnt = tracing_path_debugfs_mount();
return mnt;}
void tracing_path_set(const char *mntpt){ __tracing_path_set("tracing/", mntpt);}
char *get_tracing_file(const char *name){ char *file;
if (asprintf(&file, "%s%s", tracing_path_mount(), name) < 0) return NULL;
return file;}
void put_tracing_file(char *file){ free(file);}
char *get_events_file(const char *name){ char *file;
if (asprintf(&file, "%s/events/%s", tracing_path_mount(), name) < 0) return NULL;
return file;}
void put_events_file(char *file){ free(file);}
DIR *tracing_events__opendir(void){ DIR *dir = NULL; char *path = get_tracing_file("events");
if (path) { dir = opendir(path); put_events_file(path); }
return dir;}
int tracing_events__scandir_alphasort(struct dirent ***namelist){ char *path = get_tracing_file("events"); int ret;
if (!path) { *namelist = NULL; return 0; }
ret = scandir(path, namelist, NULL, alphasort); put_events_file(path);
return ret;}
int tracing_path__strerror_open_tp(int err, char *buf, size_t size, const char *sys, const char *name){ char sbuf[128]; char filename[PATH_MAX];
snprintf(filename, PATH_MAX, "%s/%s", sys, name ?: "*");
switch (err) { case ENOENT: /* * We will get here if we can't find the tracepoint, but one of * debugfs or tracefs is configured, which means you probably * want some tracepoint which wasn't compiled in your kernel. * - jirka */ if (debugfs__configured() || tracefs__configured()) { /* sdt markers */ if (!strncmp(filename, "sdt_", 4)) { snprintf(buf, size, "Error:\tFile %s/events/%s not found.\n" "Hint:\tSDT event cannot be directly recorded on.\n" "\tPlease first use 'perf probe %s:%s' before recording it.\n", tracing_path, filename, sys, name); } else { snprintf(buf, size, "Error:\tFile %s/events/%s not found.\n" "Hint:\tPerhaps this kernel misses some CONFIG_ setting to enable this feature?.\n", tracing_path, filename); } break; } snprintf(buf, size, "%s", "Error:\tUnable to find debugfs/tracefs\n" "Hint:\tWas your kernel compiled with debugfs/tracefs support?\n" "Hint:\tIs the debugfs/tracefs filesystem mounted?\n" "Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'"); break; case EACCES: { snprintf(buf, size, "Error:\tNo permissions to read %s/events/%s\n" "Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n", tracing_path, filename, tracing_path_mount()); } break; default: snprintf(buf, size, "%s", str_error_r(err, sbuf, sizeof(sbuf))); break; }
return 0;}