tools lib api fs: Add sysfs__write_int function

[sfrench/cifs-2.6.git] / tools / lib / api / fs / fs.c

diff --git a/tools/lib/api/fs/fs.c b/tools/lib/api/fs/fs.c
index 809c7721cd2451a5e1a8e3bbe5a3994965106346..a7ecf8f469f47921ec0734eb4142a4da64f6c5a7 100644 (file)
--- 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);
+}