file_utils.c File Reference

#include "postgres.h"
#include <dirent.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
#include "common/file_utils.h"

Include dependency graph for file_utils.c:

Go to the source code of this file.

Functions
PGFileType	get_dirent_type (const char *path, const struct dirent *de, bool look_through_symlinks, int elevel)

Function Documentation

get_dirent_type()

PGFileType get_dirent_type	(	const char *	path,
		const struct dirent *	de,
		bool	look_through_symlinks,
		int	elevel
	)

Definition at line 410 of file file_utils.c.

References dirent::d_type, DT_DIR, DT_LNK, DT_REG, ereport, errcode_for_file_access(), errmsg(), lstat, pg_log_generic(), PGFILETYPE_DIR, PGFILETYPE_ERROR, PGFILETYPE_LNK, PGFILETYPE_REG, PGFILETYPE_UNKNOWN, S_ISDIR, S_ISREG, stat::st_mode, and stat.

Referenced by walkdir().

{
    PGFileType  result;

    /*
     * Some systems tell us the type directly in the dirent struct, but that's
     * a BSD and Linux extension not required by POSIX.  Even when the
     * interface is present, sometimes the type is unknown, depending on the
     * filesystem.
     */
#if defined(DT_REG) && defined(DT_DIR) && defined(DT_LNK)
    if (de->d_type == DT_REG)
        result = PGFILETYPE_REG;
    else if (de->d_type == DT_DIR)
        result = PGFILETYPE_DIR;
    else if (de->d_type == DT_LNK && !look_through_symlinks)
        result = PGFILETYPE_LNK;
    else
        result = PGFILETYPE_UNKNOWN;
#else
    result = PGFILETYPE_UNKNOWN;
#endif

    if (result == PGFILETYPE_UNKNOWN)
    {
        struct stat fst;
        int         sret;


        if (look_through_symlinks)
            sret = stat(path, &fst);
        else
            sret = lstat(path, &fst);

        if (sret < 0)
        {
            result = PGFILETYPE_ERROR;
#ifdef FRONTEND
            pg_log_generic(elevel, "could not stat file \"%s\": %m", path);
#else
            ereport(elevel,
                    (errcode_for_file_access(),
                     errmsg("could not stat file \"%s\": %m", path)));
#endif
        }
        else if (S_ISREG(fst.st_mode))
            result = PGFILETYPE_REG;
        else if (S_ISDIR(fst.st_mode))
            result = PGFILETYPE_DIR;
#ifdef S_ISLNK
        else if (S_ISLNK(fst.st_mode))
            result = PGFILETYPE_LNK;
#endif
    }

    return result;
}