diff options
Diffstat (limited to 'src/tail.c')
| -rw-r--r-- | src/tail.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/src/tail.c b/src/tail.c index a2a8979b1..aaf259314 100644 --- a/src/tail.c +++ b/src/tail.c @@ -1,5 +1,5 @@ /* tail -- output the last part of file(s) - Copyright (C) 89, 90, 91, 1995-1999 Free Software Foundation, Inc. + Copyright (C) 89, 90, 91, 1995-2000 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -84,6 +84,10 @@ enum Follow_mode Follow_descriptor = 2 }; +/* The types of files for which tail works. */ +#define IS_TAILABLE_FILE_TYPE(Mode) \ + (S_ISREG (Mode) || S_ISFIFO (Mode) || S_ISCHR (Mode)) + static char const *const follow_mode_string[] = { "descriptor", "name", 0 @@ -748,6 +752,13 @@ recheck (struct File_spec *f) error (0, errno, "%s", pretty_name (f)); } } + else if (!IS_TAILABLE_FILE_TYPE (new_stats.st_mode)) + { + fail = 1; + f->errnum = -1; + error (0, 0, _("`%s' has been replaced with an untailable file"), + pretty_name (f)); + } else { f->errnum = 0; @@ -1133,6 +1144,13 @@ tail_file (struct File_spec *f, off_t n_units) f->errnum = errno; error (0, errno, "%s", pretty_name (f)); } + else if (!IS_TAILABLE_FILE_TYPE (stats.st_mode)) + { + error (0, 0, _("%s: cannot follow end of this type of file"), + pretty_name (f)); + errors = 1; + f->errnum = -1; + } if (errors) { |