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authorKan Liang <Kan.liang@intel.com>2017-05-26 12:05:37 -0700
committerArnaldo Carvalho de Melo <acme@redhat.com>2017-06-21 11:35:27 -0300
commit3b00ea938653d136c8e4bcbe9722d954e128ce2e (patch)
tree6af90bcd4ad08b97c26579890f57b11ac332a3e2 /tools/lib/api/fs
parentfd25bf8b8c577aef8c0156eddaf63f3e862c659c (diff)
tools lib api fs: Add sysfs__write_int function
Add sysfs__write_int() to ease up writing int to sysfs. New interface is: int sysfs__write_int(const char *entry, int value); Also, introducing filename__write_int() which is useful for new helpers to write sysctl values. Signed-off-by: Kan Liang <Kan.liang@intel.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Cc: Andi Kleen <ak@linux.intel.com> Cc: Kan Liang <kan.liang@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Robert Elliott <elliott@hpe.com> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1495825538-5230-2-git-send-email-kan.liang@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/lib/api/fs')
-rw-r--r--tools/lib/api/fs/fs.c30
-rw-r--r--tools/lib/api/fs/fs.h4
2 files changed, 34 insertions, 0 deletions
diff --git a/tools/lib/api/fs/fs.c b/tools/lib/api/fs/fs.c
index 809c7721cd24..a7ecf8f469f4 100644
--- a/tools/lib/api/fs/fs.c
+++ b/tools/lib/api/fs/fs.c
@@ -387,6 +387,22 @@ int filename__read_str(const char *filename, char **buf, size_t *sizep)
return err;
}
+int filename__write_int(const char *filename, int value)
+{
+ int fd = open(filename, O_WRONLY), err = -1;
+ char buf[64];
+
+ if (fd < 0)
+ return err;
+
+ sprintf(buf, "%d", value);
+ if (write(fd, buf, sizeof(buf)) == sizeof(buf))
+ err = 0;
+
+ close(fd);
+ return err;
+}
+
int procfs__read_str(const char *entry, char **buf, size_t *sizep)
{
char path[PATH_MAX];
@@ -480,3 +496,17 @@ int sysctl__read_int(const char *sysctl, int *value)
return filename__read_int(path, value);
}
+
+int sysfs__write_int(const char *entry, int value)
+{
+ char path[PATH_MAX];
+ const char *sysfs = sysfs__mountpoint();
+
+ if (!sysfs)
+ return -1;
+
+ if (snprintf(path, sizeof(path), "%s/%s", sysfs, entry) >= PATH_MAX)
+ return -1;
+
+ return filename__write_int(path, value);
+}
diff --git a/tools/lib/api/fs/fs.h b/tools/lib/api/fs/fs.h
index 956c21127d1e..45605348461e 100644
--- a/tools/lib/api/fs/fs.h
+++ b/tools/lib/api/fs/fs.h
@@ -31,6 +31,8 @@ int filename__read_int(const char *filename, int *value);
int filename__read_ull(const char *filename, unsigned long long *value);
int filename__read_str(const char *filename, char **buf, size_t *sizep);
+int filename__write_int(const char *filename, int value);
+
int procfs__read_str(const char *entry, char **buf, size_t *sizep);
int sysctl__read_int(const char *sysctl, int *value);
@@ -38,4 +40,6 @@ 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);
+
+int sysfs__write_int(const char *entry, int value);
#endif /* __API_FS__ */