From 553873e1df63a20559ac9c336765dc7055cfc3d4 Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Mon, 9 Dec 2013 17:14:23 +0100 Subject: tools/: Convert to new topic libraries Move debugfs.* to api/fs/. We have a common tools/lib/api/ place where the Makefile lives and then we place the headers in subdirs. For example, all the fs-related stuff goes to tools/lib/api/fs/ from which we get libapikfs.a (acme got almost the naming he wanted :-)) and we link it into the tools which need it - in this case perf and tools/vm/page-types. acme: "Looking at the implementation, I think some tools can even link directly to the .o files, avoiding the .a file altogether. But that is just an optimization/finer granularity tools/lib/ cherrypicking that toolers can make use of." Fixup documentation cleaning target while at it. Signed-off-by: Borislav Petkov Acked-by: Ingo Molnar Cc: Adrian Hunter Cc: Andi Kleen Cc: Arjan van de Ven Cc: David Ahern Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: Jiri Olsa Cc: Mike Galbraith Cc: Namhyung Kim Cc: Paul Mackerras Cc: Pekka Enberg Cc: Peter Zijlstra Cc: Robert Richter Cc: Stanislav Fomichev Cc: Stephane Eranian Cc: Steven Rostedt Link: http://lkml.kernel.org/r/1386605664-24041-2-git-send-email-bp@alien8.de Signed-off-by: Arnaldo Carvalho de Melo --- tools/lib/api/fs/debugfs.c | 100 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 100 insertions(+) create mode 100644 tools/lib/api/fs/debugfs.c (limited to 'tools/lib/api/fs/debugfs.c') diff --git a/tools/lib/api/fs/debugfs.c b/tools/lib/api/fs/debugfs.c new file mode 100644 index 00000000000..7c434796235 --- /dev/null +++ b/tools/lib/api/fs/debugfs.c @@ -0,0 +1,100 @@ +#include +#include +#include +#include +#include +#include +#include +#include + +#include "debugfs.h" + +char debugfs_mountpoint[PATH_MAX + 1] = "/sys/kernel/debug"; + +static const char * const debugfs_known_mountpoints[] = { + "/sys/kernel/debug/", + "/debug/", + 0, +}; + +static bool debugfs_found; + +/* find the path to the mounted debugfs */ +const char *debugfs_find_mountpoint(void) +{ + const char * const *ptr; + char type[100]; + FILE *fp; + + if (debugfs_found) + return (const char *)debugfs_mountpoint; + + ptr = debugfs_known_mountpoints; + while (*ptr) { + if (debugfs_valid_mountpoint(*ptr) == 0) { + debugfs_found = true; + strcpy(debugfs_mountpoint, *ptr); + return debugfs_mountpoint; + } + ptr++; + } + + /* give up and parse /proc/mounts */ + fp = fopen("/proc/mounts", "r"); + if (fp == NULL) + return NULL; + + while (fscanf(fp, "%*s %" STR(PATH_MAX) "s %99s %*s %*d %*d\n", + debugfs_mountpoint, type) == 2) { + if (strcmp(type, "debugfs") == 0) + break; + } + fclose(fp); + + if (strcmp(type, "debugfs") != 0) + return NULL; + + debugfs_found = true; + + return debugfs_mountpoint; +} + +/* verify that a mountpoint is actually a debugfs instance */ + +int debugfs_valid_mountpoint(const char *debugfs) +{ + struct statfs st_fs; + + if (statfs(debugfs, &st_fs) < 0) + return -ENOENT; + else if (st_fs.f_type != (long) DEBUGFS_MAGIC) + return -ENOENT; + + return 0; +} + +/* mount the debugfs somewhere if it's not mounted */ +char *debugfs_mount(const char *mountpoint) +{ + /* see if it's already mounted */ + if (debugfs_find_mountpoint()) + goto out; + + /* if not mounted and no argument */ + if (mountpoint == NULL) { + /* see if environment variable set */ + mountpoint = getenv(PERF_DEBUGFS_ENVIRONMENT); + /* if no environment variable, use default */ + if (mountpoint == NULL) + mountpoint = "/sys/kernel/debug"; + } + + if (mount(NULL, mountpoint, "debugfs", 0, NULL) < 0) + return NULL; + + /* save the mountpoint */ + debugfs_found = true; + strncpy(debugfs_mountpoint, mountpoint, sizeof(debugfs_mountpoint)); +out: + return debugfs_mountpoint; +} -- cgit v1.2.3-70-g09d2