Properly check for readdir/closedir() failures

Clear errno before calling readdir() and handle old MinGW errno bug
while adding full test coverage for readdir/closedir failures.

Backpatch through 8.4.

diff --git a/contrib/pg_archivecleanup/pg_archivecleanup.c b/contrib/pg_archivecleanup/pg_archivecleanup.c
index 8f77998de12f95f41bb95c3e05a14de6cdf18047..29271e000ac884782121e2ca8576d1105c5b731c 100644 (file)
--- a/contrib/pg_archivecleanup/pg_archivecleanup.c
+++ b/contrib/pg_archivecleanup/pg_archivecleanup.c
@@ -117,7 +117,7 @@ CleanupPriorWALFiles(void)
 
    if ((xldir = opendir(archiveLocation)) != NULL)
    {
-       while ((xlde = readdir(xldir)) != NULL)
+       while (errno = 0, (xlde = readdir(xldir)) != NULL)
        {
            strncpy(walfile, xlde->d_name, MAXPGPATH);
            TrimExtension(walfile, additional_ext);
@@ -175,7 +175,19 @@ CleanupPriorWALFiles(void)
                }
            }
        }
-       closedir(xldir);
+
+#ifdef WIN32
+       /* Bug in old Mingw dirent.c;  fixed in mingw-runtime-3.2, 2003-10-10 */
+       if (GetLastError() == ERROR_NO_MORE_FILES)
+           errno = 0;
+#endif
+
+       if (errno)
+           fprintf(stderr, "%s: could not read archive location \"%s\": %s\n",
+                   progname, archiveLocation, strerror(errno));
+       if (closedir(xldir))
+           fprintf(stderr, "%s: could not close archive location \"%s\": %s\n",
+                   progname, archiveLocation, strerror(errno));
    }
    else
        fprintf(stderr, "%s: could not open archive location \"%s\": %s\n",

diff --git a/contrib/pg_standby/pg_standby.c b/contrib/pg_standby/pg_standby.c
index 0f1e0c1dfc86d2392bc3f16b7b01ae006267d45a..bdb3362b4b671ad35f65d2ab9c4f3fa925aeb758 100644 (file)
--- a/contrib/pg_standby/pg_standby.c
+++ b/contrib/pg_standby/pg_standby.c
@@ -256,7 +256,7 @@ CustomizableCleanupPriorWALFiles(void)
         */
        if ((xldir = opendir(archiveLocation)) != NULL)
        {
-           while ((xlde = readdir(xldir)) != NULL)
+           while (errno = 0, (xlde = readdir(xldir)) != NULL)
            {
                /*
                 * We ignore the timeline part of the XLOG segment identifiers
@@ -294,6 +294,16 @@ CustomizableCleanupPriorWALFiles(void)
                    }
                }
            }
+
+#ifdef WIN32
+           /* Bug in old Mingw dirent.c;  fixed in mingw-runtime-3.2, 2003-10-10 */
+           if (GetLastError() == ERROR_NO_MORE_FILES)
+               errno = 0;
+#endif
+
+           if (errno)
+               fprintf(stderr, "%s: could not read archive location \"%s\": %s\n",
+                       progname, archiveLocation, strerror(errno));
            if (debug)
                fprintf(stderr, "\n");
        }
@@ -301,7 +311,10 @@ CustomizableCleanupPriorWALFiles(void)
            fprintf(stderr, "%s: could not open archive location \"%s\": %s\n",
                    progname, archiveLocation, strerror(errno));
 
-       closedir(xldir);
+       if (closedir(xldir))
+           fprintf(stderr, "%s: could not close archive location \"%s\": %s\n",
+                   progname, archiveLocation, strerror(errno));
+
        fflush(stderr);
    }
 }

diff --git a/contrib/pg_upgrade/file.c b/contrib/pg_upgrade/file.c
index a5d92c62fce80bbd582b727b6f5c66c72ec0d84e..b76fcdbf79e70262ed6918c2f36dd94356cbfe8a 100644 (file)
--- a/contrib/pg_upgrade/file.c
+++ b/contrib/pg_upgrade/file.c
@@ -258,10 +258,7 @@ load_directory(const char *dirname, char ***namelist)
    }
 
 #ifdef WIN32
-   /*
-    * This fix is in mingw cvs (runtime/mingwex/dirent.c rev 1.4), but not in
-    * released version
-    */
+   /* Bug in old Mingw dirent.c;  fixed in mingw-runtime-3.2, 2003-10-10 */
    if (GetLastError() == ERROR_NO_MORE_FILES)
        errno = 0;
 #endif
@@ -270,7 +267,9 @@ load_directory(const char *dirname, char ***namelist)
        pg_log(PG_FATAL, "could not read directory \"%s\": %s\n",
               dirname, getErrorText(errno));
 
-   closedir(dirdesc);
+   if (closedir(dirdesc))
+       pg_log(PG_FATAL, "could not close directory \"%s\": %s\n",
+              dirname, getErrorText(errno));
 
    return count;
 }

diff --git a/src/backend/storage/file/fd.c b/src/backend/storage/file/fd.c
index 8410b7a528fe476ceb6ad22e5e125b9be82f9d10..3a595a3295fd64f457631472ac3a6eef13f8ad8a 100644 (file)
--- a/src/backend/storage/file/fd.c
+++ b/src/backend/storage/file/fd.c
@@ -1746,11 +1746,7 @@ ReadDir(DIR *dir, const char *dirname)
        return dent;
 
 #ifdef WIN32
-
-   /*
-    * This fix is in mingw cvs (runtime/mingwex/dirent.c rev 1.4), but not in
-    * released version
-    */
+   /* Bug in old Mingw dirent.c;  fixed in mingw-runtime-3.2, 2003-10-10 */
    if (GetLastError() == ERROR_NO_MORE_FILES)
        errno = 0;
 #endif

diff --git a/src/bin/pg_basebackup/pg_receivexlog.c b/src/bin/pg_basebackup/pg_receivexlog.c
index 2d9f6c441b1a5c0898916695774ec848267bdde8..5f07bb28074c6e42565af3eab11475908b3e8556 100644 (file)
--- a/src/bin/pg_basebackup/pg_receivexlog.c
+++ b/src/bin/pg_basebackup/pg_receivexlog.c
@@ -123,7 +123,7 @@ FindStreamingStart(XLogRecPtr currentpos, uint32 currenttimeline)
        disconnect_and_exit(1);
    }
 
-   while ((dirent = readdir(dir)) != NULL)
+   while (errno = 0, (dirent = readdir(dir)) != NULL)
    {
        char        fullpath[MAXPGPATH];
        struct stat statbuf;
@@ -197,7 +197,25 @@ FindStreamingStart(XLogRecPtr currentpos, uint32 currenttimeline)
        }
    }
 
-   closedir(dir);
+#ifdef WIN32
+   /* Bug in old Mingw dirent.c;  fixed in mingw-runtime-3.2, 2003-10-10 */
+   if (GetLastError() == ERROR_NO_MORE_FILES)
+       errno = 0;
+#endif
+
+   if (errno)
+   {
+       fprintf(stderr, _("%s: could not read directory \"%s\": %s\n"),
+               progname, basedir, strerror(errno));
+       disconnect_and_exit(1);
+   }
+
+   if (closedir(dir))
+   {
+       fprintf(stderr, _("%s: could not close directory \"%s\": %s\n"),
+               progname, basedir, strerror(errno));
+       disconnect_and_exit(1);
+   }
 
    if (high_log > 0 || high_seg > 0)
    {

diff --git a/src/bin/pg_resetxlog/pg_resetxlog.c b/src/bin/pg_resetxlog/pg_resetxlog.c
index 80e826897c7a8b5ab8ee7ab5d4175f38fe8ce8d3..f10524f4b7c1c4ab88a460efaa6f209ace6f3487 100644 (file)
--- a/src/bin/pg_resetxlog/pg_resetxlog.c
+++ b/src/bin/pg_resetxlog/pg_resetxlog.c
@@ -748,8 +748,7 @@ FindEndOfXLOG(void)
        exit(1);
    }
 
-   errno = 0;
-   while ((xlde = readdir(xldir)) != NULL)
+   while (errno = 0, (xlde = readdir(xldir)) != NULL)
    {
        if (strlen(xlde->d_name) == 24 &&
            strspn(xlde->d_name, "0123456789ABCDEF") == 24)
@@ -773,25 +772,27 @@ FindEndOfXLOG(void)
                newXlogSeg = seg;
            }
        }
-       errno = 0;
    }
-#ifdef WIN32
 
-   /*
-    * This fix is in mingw cvs (runtime/mingwex/dirent.c rev 1.4), but not in
-    * released version
-    */
+#ifdef WIN32
+   /* Bug in old Mingw dirent.c;  fixed in mingw-runtime-3.2, 2003-10-10 */
    if (GetLastError() == ERROR_NO_MORE_FILES)
        errno = 0;
 #endif
 
    if (errno)
    {
-       fprintf(stderr, _("%s: could not read from directory \"%s\": %s\n"),
+       fprintf(stderr, _("%s: could not read directory \"%s\": %s\n"),
+               progname, XLOGDIR, strerror(errno));
+       exit(1);
+   }
+
+   if (closedir(xldir))
+   {
+       fprintf(stderr, _("%s: could not close directory \"%s\": %s\n"),
                progname, XLOGDIR, strerror(errno));
        exit(1);
    }
-   closedir(xldir);
 
    /*
     * Finally, convert to new xlog seg size, and advance by one to ensure we
@@ -823,8 +824,7 @@ KillExistingXLOG(void)
        exit(1);
    }
 
-   errno = 0;
-   while ((xlde = readdir(xldir)) != NULL)
+   while (errno = 0, (xlde = readdir(xldir)) != NULL)
    {
        if (strlen(xlde->d_name) == 24 &&
            strspn(xlde->d_name, "0123456789ABCDEF") == 24)
@@ -837,25 +837,27 @@ KillExistingXLOG(void)
                exit(1);
            }
        }
-       errno = 0;
    }
-#ifdef WIN32
 
-   /*
-    * This fix is in mingw cvs (runtime/mingwex/dirent.c rev 1.4), but not in
-    * released version
-    */
+#ifdef WIN32
+   /* Bug in old Mingw dirent.c;  fixed in mingw-runtime-3.2, 2003-10-10 */
    if (GetLastError() == ERROR_NO_MORE_FILES)
        errno = 0;
 #endif
 
    if (errno)
    {
-       fprintf(stderr, _("%s: could not read from directory \"%s\": %s\n"),
+       fprintf(stderr, _("%s: could not read directory \"%s\": %s\n"),
+               progname, XLOGDIR, strerror(errno));
+       exit(1);
+   }
+
+   if (closedir(xldir))
+   {
+       fprintf(stderr, _("%s: could not close directory \"%s\": %s\n"),
                progname, XLOGDIR, strerror(errno));
        exit(1);
    }
-   closedir(xldir);
 }
 
 
@@ -879,8 +881,7 @@ KillExistingArchiveStatus(void)
        exit(1);
    }
 
-   errno = 0;
-   while ((xlde = readdir(xldir)) != NULL)
+   while (errno = 0, (xlde = readdir(xldir)) != NULL)
    {
        if (strspn(xlde->d_name, "0123456789ABCDEF") == 24 &&
            (strcmp(xlde->d_name + 24, ".ready") == 0 ||
@@ -894,25 +895,27 @@ KillExistingArchiveStatus(void)
                exit(1);
            }
        }
-       errno = 0;
    }
-#ifdef WIN32
 
-   /*
-    * This fix is in mingw cvs (runtime/mingwex/dirent.c rev 1.4), but not in
-    * released version
-    */
+#ifdef WIN32
+   /* Bug in old Mingw dirent.c;  fixed in mingw-runtime-3.2, 2003-10-10 */
    if (GetLastError() == ERROR_NO_MORE_FILES)
        errno = 0;
 #endif
 
    if (errno)
    {
-       fprintf(stderr, _("%s: could not read from directory \"%s\": %s\n"),
+       fprintf(stderr, _("%s: could not read directory \"%s\": %s\n"),
+               progname, ARCHSTATDIR, strerror(errno));
+       exit(1);
+   }
+
+   if (closedir(xldir))
+   {
+       fprintf(stderr, _("%s: could not close directory \"%s\": %s\n"),
                progname, ARCHSTATDIR, strerror(errno));
        exit(1);
    }
-   closedir(xldir);
 }
 
 

diff --git a/src/port/dirent.c b/src/port/dirent.c
index 162e40a21acc1d082b85236989d0ca350bd6020c..6fdb24f2974a06610327d4b10b528e98aa62af9f 100644 (file)
--- a/src/port/dirent.c
+++ b/src/port/dirent.c
@@ -105,15 +105,19 @@ readdir(DIR *d)
    strcpy(d->ret.d_name, fd.cFileName);        /* Both strings are MAX_PATH
                                                 * long */
    d->ret.d_namlen = strlen(d->ret.d_name);
+
    return &d->ret;
 }
 
 int
 closedir(DIR *d)
 {
+   int ret = 0;
+
    if (d->handle != INVALID_HANDLE_VALUE)
-       FindClose(d->handle);
+       ret = !FindClose(d->handle);
    free(d->dirname);
    free(d);
-   return 0;
+
+   return ret;
 }

diff --git a/src/port/dirmod.c b/src/port/dirmod.c
index 514424f82e635dd721b184e009dccce1a4d52bf7..80932ed966d16f534066723001de64b161e75e00 100644 (file)
--- a/src/port/dirmod.c
+++ b/src/port/dirmod.c
@@ -456,8 +456,7 @@ pgfnames(const char *path)
 
    filenames = (char **) palloc(fnsize * sizeof(char *));
 
-   errno = 0;
-   while ((file = readdir(dir)) != NULL)
+   while (errno = 0, (file = readdir(dir)) != NULL)
    {
        if (strcmp(file->d_name, ".") != 0 && strcmp(file->d_name, "..") != 0)
        {
@@ -469,17 +468,14 @@ pgfnames(const char *path)
            }
            filenames[numnames++] = pstrdup(file->d_name);
        }
-       errno = 0;
    }
-#ifdef WIN32
 
-   /*
-    * This fix is in mingw cvs (runtime/mingwex/dirent.c rev 1.4), but not in
-    * released version
-    */
+#ifdef WIN32
+   /* Bug in old Mingw dirent.c;  fixed in mingw-runtime-3.2, 2003-10-10 */
    if (GetLastError() == ERROR_NO_MORE_FILES)
        errno = 0;
 #endif
+
    if (errno)
    {
 #ifndef FRONTEND
@@ -492,7 +488,15 @@ pgfnames(const char *path)
 
    filenames[numnames] = NULL;
 
-   closedir(dir);
+   if (closedir(dir))
+   {
+#ifndef FRONTEND
+       elog(WARNING, "could not close directory \"%s\": %m", path);
+#else
+       fprintf(stderr, _("could not close directory \"%s\": %s\n"),
+               path, strerror(errno));
+#endif
+   }
 
    return filenames;
 }

diff --git a/src/port/pgcheckdir.c b/src/port/pgcheckdir.c
index f4bb0f218a7fed20fc31d5542413e4fa639a4d80..36545618e454b434a338a8d17c6a655494d9acab 100644 (file)
--- a/src/port/pgcheckdir.c
+++ b/src/port/pgcheckdir.c
@@ -32,14 +32,12 @@ pg_check_dir(const char *dir)
    DIR        *chkdir;
    struct dirent *file;
 
-   errno = 0;
-
    chkdir = opendir(dir);
 
    if (chkdir == NULL)
        return (errno == ENOENT) ? 0 : -1;
 
-   while ((file = readdir(chkdir)) != NULL)
+   while (errno = 0, (file = readdir(chkdir)) != NULL)
    {
        if (strcmp(".", file->d_name) == 0 ||
            strcmp("..", file->d_name) == 0)
@@ -55,18 +53,12 @@ pg_check_dir(const char *dir)
    }
 
 #ifdef WIN32
-
-   /*
-    * This fix is in mingw cvs (runtime/mingwex/dirent.c rev 1.4), but not in
-    * released version
-    */
+   /* Bug in old Mingw dirent.c;  fixed in mingw-runtime-3.2, 2003-10-10 */
    if (GetLastError() == ERROR_NO_MORE_FILES)
        errno = 0;
 #endif
 
-   closedir(chkdir);
-
-   if (errno != 0)
+   if (errno || closedir(chkdir))
        result = -1;            /* some kind of I/O error? */
 
    return result;