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tools lib api fs: Add sysfs__read_str function

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Adding sysfs__read_str function to ease up reading string files from
sysfs. New interface is:

  int sysfs__read_str(const char *entry, char **buf, size_t *sizep);

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1455465826-8426-4-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2016-02-14 17:03:44 +01:00 committed by Arnaldo Carvalho de Melo
parent 607bfbd7ff
commit 51c0396c60
2 changed files with 14 additions and 0 deletions
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13
tools/lib/api/fs/fs.c
View File

@ -377,6 +377,19 @@ int sysfs__read_int(const char *entry, int *value)
return filename__read_int(path, value);
}
int sysfs__read_str(const char *entry, char **buf, size_t *sizep)
{
char path[PATH_MAX];
const char *sysfs = sysfs__mountpoint();
if (!sysfs)
return -1;
snprintf(path, sizeof(path), "%s/%s", sysfs, entry);
return filename__read_str(path, buf, sizep);
}
int sysctl__read_int(const char *sysctl, int *value)
{
char path[PATH_MAX];

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

@ -32,4 +32,5 @@ int filename__read_str(const char *filename, 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);
int sysfs__read_str(const char *entry, char **buf, size_t *sizep);
#endif /* __API_FS__ */