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authorArnaldo Carvalho de Melo <acme@redhat.com>2016-04-26 12:31:16 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-04-26 13:15:00 -0300
commit4bd112df3eea4db63fe90fb4e83c48d3f3bd6512 (patch)
treeec7db18635dd1db653271c0dd620af240e1384f4
parentccd9b2a7f82b069b8e8ac892fd9c1c22e7b11eba (diff)
tools lib api fs: Add helper to read string from procfs file
To read things like /proc/self/comm. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Borislav Petkov <bp@suse.de> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Milian Wolff <milian.wolff@kdab.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-ztpkbmseidt0hq2psr46o0h9@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r--tools/lib/api/fs/fs.c13
-rw-r--r--tools/lib/api/fs/fs.h2
2 files changed, 15 insertions, 0 deletions
diff --git a/tools/lib/api/fs/fs.c b/tools/lib/api/fs/fs.c
index ef78c22ff44d..08556cf2c70d 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 9f6598098dc5..16c9c2ed7c5b 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);