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Subject[PATCH 04/11] tools lib api fs: Introduce sysfs__read_bool
Date
From: Alexander Shishkin <alexander.shishkin@linux.intel.com>

Will be used in a upcoming patch warning about PERF_RECORD_AUX data
gaps, reading the "module/kvm_intel/parameters/vmm_exclusive" sysfs
entry.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Cc: Vince Weaver <vince@deater.net>
Link: http://lkml.kernel.org/r/8760j941ig.fsf@ashishki-desk.ger.corp.intel.com
[ split from a larger patch ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/lib/api/fs/fs.c | 29 +++++++++++++++++++++++++++++
tools/lib/api/fs/fs.h | 1 +
2 files changed, 30 insertions(+)

diff --git a/tools/lib/api/fs/fs.c b/tools/lib/api/fs/fs.c
index 4b6bfc43cccf..809c7721cd24 100644
--- a/tools/lib/api/fs/fs.c
+++ b/tools/lib/api/fs/fs.c
@@ -439,6 +439,35 @@ int sysfs__read_str(const char *entry, char **buf, size_t *sizep)
return filename__read_str(path, buf, sizep);
}

+int sysfs__read_bool(const char *entry, bool *value)
+{
+ char *buf;
+ size_t size;
+ int ret;
+
+ ret = sysfs__read_str(entry, &buf, &size);
+ if (ret < 0)
+ return ret;
+
+ switch (buf[0]) {
+ case '1':
+ case 'y':
+ case 'Y':
+ *value = true;
+ break;
+ case '0':
+ case 'n':
+ case 'N':
+ *value = false;
+ break;
+ default:
+ ret = -1;
+ }
+
+ free(buf);
+
+ return ret;
+}
int sysctl__read_int(const char *sysctl, int *value)
{
char path[PATH_MAX];
diff --git a/tools/lib/api/fs/fs.h b/tools/lib/api/fs/fs.h
index 6b332dc74498..956c21127d1e 100644
--- a/tools/lib/api/fs/fs.h
+++ b/tools/lib/api/fs/fs.h
@@ -37,4 +37,5 @@ 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);
int sysfs__read_str(const char *entry, char **buf, size_t *sizep);
+int sysfs__read_bool(const char *entry, bool *value);
#endif /* __API_FS__ */
--
2.9.3
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