From: Borislav Petkov <[email protected]> Add helper functions to be able to read/write ints into proc files.
Signed-off-by: Borislav Petkov <[email protected]> --- 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); -- 2.11.0 -- Regards/Gruss, Boris. Good mailing practices for 400: avoid top-posting and trim the reply.
