Commit-ID: 4bd112df3eea4db63fe90fb4e83c48d3f3bd6512 Gitweb: http://git.kernel.org/tip/4bd112df3eea4db63fe90fb4e83c48d3f3bd6512 Author: Arnaldo Carvalho de Melo <[email protected]> AuthorDate: Tue, 26 Apr 2016 12:31:16 -0300 Committer: Arnaldo Carvalho de Melo <[email protected]> CommitDate: Tue, 26 Apr 2016 13:15:00 -0300
tools lib api fs: Add helper to read string from procfs file To read things like /proc/self/comm. Cc: Adrian Hunter <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: David Ahern <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Milian Wolff <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Wang Nan <[email protected]> Link: http://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]> --- tools/lib/api/fs/fs.c | 13 +++++++++++++ tools/lib/api/fs/fs.h | 2 ++ 2 files changed, 15 insertions(+) diff --git a/tools/lib/api/fs/fs.c b/tools/lib/api/fs/fs.c index ef78c22..08556cf 100644 --- a/tools/lib/api/fs/fs.c +++ b/tools/lib/api/fs/fs.c @@ -351,6 +351,19 @@ int filename__read_str(const char *filename, char **buf, size_t *sizep) return err; } +int procfs__read_str(const char *entry, char **buf, size_t *sizep) +{ + char path[PATH_MAX]; + const char *procfs = procfs__mountpoint(); + + if (!procfs) + return -1; + + snprintf(path, sizeof(path), "%s/%s", procfs, entry); + + return filename__read_str(path, buf, sizep); +} + 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 9f65980..16c9c2e 100644 --- a/tools/lib/api/fs/fs.h +++ b/tools/lib/api/fs/fs.h @@ -29,6 +29,8 @@ int filename__read_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_str(const char *entry, char **buf, size_t *sizep); + int sysctl__read_int(const char *sysctl, int *value); int sysfs__read_int(const char *entry, int *value); int sysfs__read_ull(const char *entry, unsigned long long *value);
