applying fix for:

    0000265: tail -f should keep following files even if they
                    were truncated



git-svn-id: svn://busybox.net/trunk/busybox@10884 69ca8d6d-28ef-0310-b511-8ec308f3f277

1 files changed, 12 insertions, 0 deletions

diff --git a/coreutils/tail.c b/coreutils/tail.c
index e3f89d2ee..d49539916 100644
--- a/coreutils/tail.c
+++ b/coreutils/tail.c
@@ -79,7 +79,19 @@ static void tail_xbb_full_write(const char *buf, size_t len)
 static ssize_t tail_read(int fd, char *buf, size_t count)
 {
         ssize_t r;
+        off_t current,end;
+        struct stat sbuf;
+        int ret;
 
+        end = current = lseek (fd, 0, SEEK_CUR);
+        if (!fstat(fd, &sbuf)){
+            end = sbuf.st_size;
+        }
+        if ( end < current) {
+                lseek(fd, 0, SEEK_SET);
+        } else {
+                lseek(fd, current, SEEK_SET);
+        }
         if ((r = safe_read(fd, buf, count)) < 0) {
                 bb_perror_msg("read");
                 status = EXIT_FAILURE;