top: add config option and code for global CPU % display

1 files changed, 9 insertions, 2 deletions

diff --git a/libbb/procps.c b/libbb/procps.c
index be0d61bd3..1e2495a5a 100644
--- a/libbb/procps.c
+++ b/libbb/procps.c
@@ -79,8 +79,15 @@ const char* get_cached_groupname(gid_t gid)
 
 static int read_to_buf(const char *filename, void *buf)
 {
-        ssize_t ret;
-        ret = open_read_close(filename, buf, PROCPS_BUFSIZE-1);
+        int fd;
+        /* open_read_close() would do two reads, checking for EOF.
+         * When you have 10000 /proc/$NUM/stat to read, it isn't desirable */
+        ssize_t ret = -1;
+        fd = open(filename, O_RDONLY);
+        if (fd >= 0) {
+                ret = read(fd, buf, PROCPS_BUFSIZE-1);
+                close(fd);
+        }
         ((char *)buf)[ret > 0 ? ret : 0] = '\0';
         return ret;
 }