package/busybox/patches/990-upstream_tail_fix.patch

   1 diff -urN busybox-1.7.2/coreutils/tail.c busybox-1.7.2-tail/coreutils/tail.c
   2 --- busybox-1.7.2/coreutils/tail.c      2007-09-03 12:48:40.000000000 +0100
   3 +++ busybox-1.7.2-tail/coreutils/tail.c 2007-10-02 11:16:28.000000000 +0100
   4 @@ -47,13 +47,16 @@
   5  static ssize_t tail_read(int fd, char *buf, size_t count)
   6  {
   7         ssize_t r;
   8 -       off_t current, end;
   9 +       off_t current;
  10         struct stat sbuf;
  11
  12 -       end = current = lseek(fd, 0, SEEK_CUR);
  13 -       if (!fstat(fd, &sbuf))
  14 -               end = sbuf.st_size;
  15 -       lseek(fd, end < current ? 0 : current, SEEK_SET);
  16 +       /* (A good comment is missing here) */
  17 +       current = lseek(fd, 0, SEEK_CUR);
  18 +       /* /proc files report zero st_size, don't lseek them. */
  19 +       if (fstat(fd, &sbuf) == 0 && sbuf.st_size)
  20 +               if (sbuf.st_size < current)
  21 +                       lseek(fd, 0, SEEK_SET);
  22 +
  23         r = safe_read(fd, buf, count);
  24         if (r < 0) {
  25                 bb_perror_msg(bb_msg_read_error);
  26 @@ -67,8 +70,12 @@
  27
  28  static unsigned eat_num(const char *p)
  29  {
  30 -       if (*p == '-') p++;
  31 -       else if (*p == '+') { p++; G.status = EXIT_FAILURE; }
  32 +       if (*p == '-')
  33 +               p++;
  34 +       else if (*p == '+') {
  35 +               p++;
  36 +               G.status = EXIT_FAILURE;
  37 +       }
  38         return xatou_sfx(p, tail_suffixes);
  39  }
  40