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    Subject[PATCH 08/10] perf, tool: Add sysfs read file interface
    Date
    Adding read file interface to access sysfs files data.

    int sysfs_read_file(const char *file, char *buf, size_t size)

    The 'file' argument is file path relative to the sysfs mount.

    Signed-off-by: Jiri Olsa <jolsa@redhat.com>
    ---
    tools/perf/util/sysfs.c | 19 +++++++++++++++++++
    tools/perf/util/sysfs.h | 1 +
    2 files changed, 20 insertions(+)

    diff --git a/tools/perf/util/sysfs.c b/tools/perf/util/sysfs.c
    index 48c6902..4ee886a 100644
    --- a/tools/perf/util/sysfs.c
    +++ b/tools/perf/util/sysfs.c
    @@ -58,3 +58,22 @@ const char *sysfs_find_mountpoint(void)

    return sysfs_found ? sysfs_mountpoint : NULL;
    }
    +
    +int sysfs_read_file(const char *file, char *buf, size_t size)
    +{
    + char path[PATH_MAX];
    + FILE *fp;
    + int ret = 0;
    +
    + snprintf(path, PATH_MAX, "%s/%s", sysfs_mountpoint, file);
    +
    + fp = fopen(path, "r");
    + if (!fp)
    + return -errno;
    +
    + if (fread(buf, 1, size, fp) == 0)
    + ret = -errno;
    +
    + fclose(fp);
    + return ret;
    +}
    diff --git a/tools/perf/util/sysfs.h b/tools/perf/util/sysfs.h
    index a813b72..5ce99e7 100644
    --- a/tools/perf/util/sysfs.h
    +++ b/tools/perf/util/sysfs.h
    @@ -2,5 +2,6 @@
    #define __SYSFS_H__

    const char *sysfs_find_mountpoint(void);
    +int sysfs_read_file(const char *file, char *buf, size_t size);

    #endif /* __DEBUGFS_H__ */
    --
    1.7.10.4


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