diff options
| author | Jiri Olsa <jolsa@redhat.com> | 2012-01-27 15:34:22 +0100 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2012-02-13 23:27:15 -0200 |
| commit | e90fda0635401225ca7c2343bea2f6d279347d10 (patch) | |
| tree | d87047ae41bacd526c7658572372f86fbd572df1 /tools/perf | |
| parent | 2837609fefbfe8f1248bfce09d9f0b44d5eb713d (diff) | |
perf tools: Add sysfs mountpoint interface
Adding sysfs object to provide sysfs mount information in the same way
as debugfs object does.
The object provides following function:
sysfs_find_mountpoint
which returns the sysfs mount mount.
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1327674868-10486-4-git-send-email-jolsa@redhat.com
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
| -rw-r--r-- | tools/perf/Makefile | 2 | ||||
| -rw-r--r-- | tools/perf/util/sysfs.c | 60 | ||||
| -rw-r--r-- | tools/perf/util/sysfs.h | 6 |
3 files changed, 68 insertions, 0 deletions
diff --git a/tools/perf/Makefile b/tools/perf/Makefile index 8359fa140d2d..e011b5060f92 100644 --- a/tools/perf/Makefile +++ b/tools/perf/Makefile @@ -259,6 +259,7 @@ LIB_H += util/callchain.h LIB_H += util/build-id.h LIB_H += util/debug.h LIB_H += util/debugfs.h +LIB_H += util/sysfs.h LIB_H += util/event.h LIB_H += util/evsel.h LIB_H += util/evlist.h @@ -305,6 +306,7 @@ LIB_OBJS += $(OUTPUT)util/build-id.o LIB_OBJS += $(OUTPUT)util/config.o LIB_OBJS += $(OUTPUT)util/ctype.o LIB_OBJS += $(OUTPUT)util/debugfs.o +LIB_OBJS += $(OUTPUT)util/sysfs.o LIB_OBJS += $(OUTPUT)util/environment.o LIB_OBJS += $(OUTPUT)util/event.o LIB_OBJS += $(OUTPUT)util/evlist.o diff --git a/tools/perf/util/sysfs.c b/tools/perf/util/sysfs.c new file mode 100644 index 000000000000..48c6902e749f --- /dev/null +++ b/tools/perf/util/sysfs.c @@ -0,0 +1,60 @@ + +#include "util.h" +#include "sysfs.h" + +static const char * const sysfs_known_mountpoints[] = { + "/sys", + 0, +}; + +static int sysfs_found; +char sysfs_mountpoint[PATH_MAX]; + +static int sysfs_valid_mountpoint(const char *sysfs) +{ + struct statfs st_fs; + + if (statfs(sysfs, &st_fs) < 0) + return -ENOENT; + else if (st_fs.f_type != (long) SYSFS_MAGIC) + return -ENOENT; + + return 0; +} + +const char *sysfs_find_mountpoint(void) +{ + const char * const *ptr; + char type[100]; + FILE *fp; + + if (sysfs_found) + return (const char *) sysfs_mountpoint; + + ptr = sysfs_known_mountpoints; + while (*ptr) { + if (sysfs_valid_mountpoint(*ptr) == 0) { + sysfs_found = 1; + strcpy(sysfs_mountpoint, *ptr); + return sysfs_mountpoint; + } + ptr++; + } + + /* give up and parse /proc/mounts */ + fp = fopen("/proc/mounts", "r"); + if (fp == NULL) + return NULL; + + while (!sysfs_found && + fscanf(fp, "%*s %" STR(PATH_MAX) "s %99s %*s %*d %*d\n", + sysfs_mountpoint, type) == 2) { + + if (strcmp(type, "sysfs") == 0) + sysfs_found = 1; + } + + fclose(fp); + + return sysfs_found ? sysfs_mountpoint : NULL; +} diff --git a/tools/perf/util/sysfs.h b/tools/perf/util/sysfs.h new file mode 100644 index 000000000000..a813b7203938 --- /dev/null +++ b/tools/perf/util/sysfs.h @@ -0,0 +1,6 @@ +#ifndef __SYSFS_H__ +#define __SYSFS_H__ + +const char *sysfs_find_mountpoint(void); + +#endif /* __DEBUGFS_H__ */ |