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tools lib api fs: Introduce sysfs__read_bool

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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>
This commit is contained in:
Alexander Shishkin 2017-03-16 18:41:59 +02:00 committed by Arnaldo Carvalho de Melo
parent f371594a51
commit b9835a9008
2 changed files with 30 additions and 0 deletions
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29
tools/lib/api/fs/fs.c
View File

@ -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];

1
tools/lib/api/fs/fs.h
View File

@ -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__ */