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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.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>
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@ -439,6 +439,35 @@ int sysfs__read_str(const char *entry, char **buf, size_t *sizep)
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return filename__read_str(path, buf, sizep);
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}
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int sysfs__read_bool(const char *entry, bool *value)
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{
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char *buf;
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size_t size;
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int ret;
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ret = sysfs__read_str(entry, &buf, &size);
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if (ret < 0)
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return ret;
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switch (buf[0]) {
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case '1':
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case 'y':
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case 'Y':
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*value = true;
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break;
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case '0':
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case 'n':
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case 'N':
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*value = false;
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break;
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default:
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ret = -1;
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}
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free(buf);
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return ret;
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}
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int sysctl__read_int(const char *sysctl, int *value)
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{
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char path[PATH_MAX];
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@ -37,4 +37,5 @@ int sysctl__read_int(const char *sysctl, int *value);
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int sysfs__read_int(const char *entry, int *value);
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int sysfs__read_ull(const char *entry, unsigned long long *value);
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int sysfs__read_str(const char *entry, char **buf, size_t *sizep);
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int sysfs__read_bool(const char *entry, bool *value);
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#endif /* __API_FS__ */
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