Commit-ID: b9835a90084bd3cc45d7ab80c37f282046bc13d3 Gitweb: http://git.kernel.org/tip/b9835a90084bd3cc45d7ab80c37f282046bc13d3 Author: Alexander Shishkin <alexander.shish...@linux.intel.com> AuthorDate: Thu, 16 Mar 2017 18:41:59 +0200 Committer: Arnaldo Carvalho de Melo <a...@redhat.com> CommitDate: Fri, 17 Mar 2017 11:49:09 -0300
tools lib api fs: Introduce sysfs__read_bool 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.shish...@linux.intel.com> Tested-by: Arnaldo Carvalho de Melo <a...@redhat.com> Cc: Adrian Hunter <adrian.hun...@intel.com> Cc: Peter Zijlstra <a.p.zijls...@chello.nl> Cc: Stephane Eranian <eran...@google.com> Cc: Vince Weaver <vi...@deater.net> Link: http://lkml.kernel.org/r/8760j941ig....@ashishki-desk.ger.corp.intel.com [ split from a larger patch ] Signed-off-by: Arnaldo Carvalho de Melo <a...@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 4b6bfc4..809c772 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 6b332dc..956c211 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__ */
