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Improve pg_check_dir code and comments.

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Avoid losing errno if readdir() fails and closedir() works.  Consistently
return 4 rather than 3 if both a lost+found directory and other files are
found, rather than returning one value or the other depending on the
order of the directory listing.  Update comments to match the actual
behavior.

These oversights date to commits 6f03927fce
and 17f1523932.

Marco Nenciarini
This commit is contained in:
Robert Haas
2015-02-17 10:19:30 -05:00
parent 23291a796f
commit 5e49c98e0a
1 changed files with 19 additions and 4 deletions
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23
src/port/pgcheckdir.c
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@ -22,7 +22,9 @@
* Returns:
* 0 if nonexistent
* 1 if exists and empty
* 2 if exists and not empty
* 2 if exists and contains _only_ dot files
* 3 if exists and contains a mount point
* 4 if exists and not empty
* -1 if trouble accessing directory (errno reflects the error)
*/
int
@ -32,6 +34,8 @@ pg_check_dir(const char *dir)
DIR *chkdir;
struct dirent *file;
bool dot_found = false;
bool mount_found = false;
int readdir_errno;
chkdir = opendir(dir);
if (chkdir == NULL)
@ -51,10 +55,10 @@ pg_check_dir(const char *dir)
{
dot_found = true;
}
/* lost+found directory */
else if (strcmp("lost+found", file->d_name) == 0)
{
result = 3; /* not empty, mount point */
break;
mount_found = true;
}
#endif
else
@ -64,9 +68,20 @@ pg_check_dir(const char *dir)
}
}
if (errno || closedir(chkdir))
if (errno)
result = -1; /* some kind of I/O error? */
/* Close chkdir and avoid overwriting the readdir errno on success */
readdir_errno = errno;
if (closedir(chkdir))
result = -1; /* error executing closedir */
else
errno = readdir_errno;
/* We report on mount point if we find a lost+found directory */
if (result == 1 && mount_found)
result = 3;
/* We report on dot-files if we _only_ find dot files */
if (result == 1 && dot_found)
result = 2;