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Once we encounter a file that is not of IS_TAILABLE_FILE_TYPE,

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marke it as such and ignore it forever after.
(struct File_spec): New member.
(recheck): Initialize new member.
(tail_file): Likewise.
(tail_forever): Skip the file if it's marked as ignorable.
This commit is contained in:
Jim Meyering
2000-03-04 18:16:21 +00:00
parent f600c4d144
commit 54d12f7edd
1 changed files with 18 additions and 4 deletions
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src/tail.c
+18 -4
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@@ -113,14 +113,19 @@ struct File_spec
dev_t dev;
ino_t ino;
/* The specified name initially referred to a directory or some other
type for which tail isn't meaningful. Unlike for a permission problem
(tailable, below) once this is set, the name is not checked ever again. */
int ignore;
/* See description of DEFAULT_MAX_N_... below. */
unsigned int n_unchanged_stats;
/* See description of DEFAULT_MAX_N_... below. */
unsigned int n_consecutive_size_changes;
/* A file is tailable if it is a regular file or a fifo and it is
readable. */
/* A file is tailable if it exists, is readable, and is of type
IS_TAILABLE_FILE_TYPE. */
int tailable;
/* The value of errno seen last time we checked this file. */
@@ -756,8 +761,10 @@ recheck (struct File_spec *f)
{
fail = 1;
f->errnum = -1;
error (0, 0, _("`%s' has been replaced with an untailable file"),
error (0, 0, _("`%s' has been replaced with an untailable file;\
giving up on this name"),
pretty_name (f));
f->ignore = 1;
}
else
{
@@ -822,6 +829,7 @@ recheck (struct File_spec *f)
f->ino = new_stats.st_ino;
f->n_unchanged_stats = 0;
f->n_consecutive_size_changes = 0;
f->ignore = 0;
/* FIXME: check lseek return value */
lseek (f->fd, f->size, SEEK_SET);
}
@@ -868,6 +876,9 @@ tail_forever (struct File_spec *f, int nfiles)
{
struct stat stats;
if (f[i].ignore)
continue;
if (f[i].fd < 0)
{
recheck (&f[i]);
@@ -1146,10 +1157,12 @@ tail_file (struct File_spec *f, off_t n_units)
}
else if (!IS_TAILABLE_FILE_TYPE (stats.st_mode))
{
error (0, 0, _("%s: cannot follow end of this type of file"),
error (0, 0, _("%s: cannot follow end of this type of file;\
giving up on this name"),
pretty_name (f));
errors = 1;
f->errnum = -1;
f->ignore = 1;
}
if (errors)
@@ -1165,6 +1178,7 @@ tail_file (struct File_spec *f, off_t n_units)
f->ino = stats.st_ino;
f->n_unchanged_stats = 0;
f->n_consecutive_size_changes = 0;
f->ignore = 0;
}
}
else