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Commit e90fda06 authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo
Browse files

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: default avatarJiri Olsa <jolsa@redhat.com>
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 2837609f

tools/perf/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -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

tools/perf/util/sysfs.c

0 → 100644
+60 −0
Original line number Diff line number Diff line 


#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;

}

tools/perf/util/sysfs.h

0 → 100644
+6 −0
Original line number Diff line number Diff line 
#ifndef __SYSFS_H__

#define __SYSFS_H__



const char *sysfs_find_mountpoint(void);



#endif /* __DEBUGFS_H__ */