Em Tue, Feb 07, 2017 at 02:09:17AM +0100, Borislav Petkov escreveu:
> From: Borislav Petkov <b...@suse.de>
>
> Add helper functions to be able to read/write ints into proc files.
>
> Signed-off-by: Borislav Petkov <b...@suse.de>
> ---
> tools/lib/api/fs/fs.c | 42 ++++++++++++++++++++++++++++++++++++++++++
> tools/lib/api/fs/fs.h | 3 +++
> 2 files changed, 45 insertions(+)
>
> diff --git a/tools/lib/api/fs/fs.c b/tools/lib/api/fs/fs.c
> index 4b6bfc43cccf..8e4b9fe18b75 100644
> --- a/tools/lib/api/fs/fs.c
> +++ b/tools/lib/api/fs/fs.c
> @@ -314,6 +314,22 @@ int filename__read_int(const char *filename, int *value)
> return err;
> }
>
> +int filename__write_int(const char *filename, int value)
> +{
> + char line[64];
> + int fd = open(filename, O_WRONLY), err = -1;
> +
> + if (fd < 0)
> + return -1;
> +
> + snprintf(line, sizeof(int), "%d", value);
> +
> + err = write(fd, line, strnlen(line, 64));
> +
> + close(fd);
> + return err;
> +}
> +
> /*
> * Parses @value out of @filename with strtoull.
> * By using 0 for base, the strtoull detects the
> @@ -400,6 +416,32 @@ int procfs__read_str(const char *entry, char **buf,
> size_t *sizep)
> return filename__read_str(path, buf, sizep);
> }
>
> +int procfs__read_int(const char *entry, int *value)
> +{
> + char path[PATH_MAX];
> + const char *procfs = procfs__mountpoint();
> +
> + if (!procfs)
> + return -1;
> +
> + snprintf(path, sizeof(path), "%s/%s", procfs, entry);
> +
> + return filename__read_int(path, value);
> +}
> +
> +int procfs__write_int(const char *entry, int value)
> +{
> + char path[PATH_MAX];
> + const char *procfs = procfs__mountpoint();
> +
> + if (!procfs)
> + return -1;
> +
> + snprintf(path, sizeof(path), "%s/%s", procfs, entry);
> +
> + return filename__write_int(path, value);
> +}
> +
> int sysfs__read_ull(const char *entry, unsigned long long *value)
> {
> char path[PATH_MAX];
> diff --git a/tools/lib/api/fs/fs.h b/tools/lib/api/fs/fs.h
> index 6b332dc74498..095f25d4c70f 100644
> --- a/tools/lib/api/fs/fs.h
> +++ b/tools/lib/api/fs/fs.h
> @@ -28,9 +28,12 @@ FS(bpf_fs)
>
>
> int filename__read_int(const char *filename, int *value);
> +int filename__write_int(const char *filename, int value);
> int filename__read_ull(const char *filename, unsigned long long *value);
> int filename__read_str(const char *filename, char **buf, size_t *sizep);
>
> +int procfs__read_int(const char *entry, int *value);
> +int procfs__write_int(const char *entry, int value);
> int procfs__read_str(const char *entry, char **buf, size_t *sizep);
>
> int sysctl__read_int(const char *sysctl, int *value);
Isn't sysctl__read_int() what you want?
See next patch...
