File::Stat

Objects of class File::Stat encapsulate common status information for File objects. The information is recorded at the moment the File::Stat object is created; changes made to the file after that point will not be reflected. File::Stat objects are returned by IO#stat, File::stat, File#lstat, and File::lstat. Many of these methods return platform-specific values, and not all values are meaningful on all systems. See also Kernel#test.

Public Class Methods

File::Stat.new(file_name) => stat click to toggle source

Create a File::Stat object for the given file name (raising an exception if the file doesn't exist).

 
               static VALUE
rb_stat_init(obj, fname)
    VALUE obj, fname;
{
    struct stat st, *nst;

    SafeStringValue(fname);

    if (stat(StringValueCStr(fname), &st) == -1) {
        rb_sys_fail(RSTRING(fname)->ptr);
    }
    if (DATA_PTR(obj)) {
        free(DATA_PTR(obj));
        DATA_PTR(obj) = NULL;
    }
    nst = ALLOC(struct stat);
    *nst = st;
    DATA_PTR(obj) = nst;

    return Qnil;
}

Public Instance Methods

stat <=> other_stat => -1, 0, 1 click to toggle source

Compares File::Stat objects by comparing their respective modification times.

f1 = File.new("f1", "w")
sleep 1
f2 = File.new("f2", "w")
f1.stat <=> f2.stat   #=> -1

 
               static VALUE
rb_stat_cmp(self, other)
    VALUE self, other;
{
    if (rb_obj_is_kind_of(other, rb_obj_class(self))) {
        time_t t1 = get_stat(self)->st_mtime;
        time_t t2 = get_stat(other)->st_mtime;
        if (t1 == t2)
            return INT2FIX(0);
        else if (t1 < t2)
            return INT2FIX(-1);
        else
            return INT2FIX(1);
    }
    return Qnil;
}

atime => time click to toggle source

Returns the last access time for this file as an object of class Time.

File.stat("testfile").atime   #=> Wed Dec 31 18:00:00 CST 1969

 
               static VALUE
rb_stat_atime(self)
    VALUE self;
{
    return rb_time_new(get_stat(self)->st_atime, 0);
}

blksize => integer or nil click to toggle source

Returns the native file system's block size. Will return nil on platforms that don't support this information.

File.stat("testfile").blksize   #=> 4096

 
               static VALUE
rb_stat_blksize(self)
    VALUE self;
{
#ifdef HAVE_ST_BLKSIZE
    return ULONG2NUM(get_stat(self)->st_blksize);
#else
    return Qnil;
#endif
}

blockdev? => true or false click to toggle source

Returns true if the file is a block device, false if it isn't or if the operating system doesn't support this feature.

File.stat("testfile").blockdev?    #=> false
File.stat("/dev/hda1").blockdev?   #=> true

 
               static VALUE
rb_stat_b(obj)
    VALUE obj;
{
#ifdef S_ISBLK
    if (S_ISBLK(get_stat(obj)->st_mode)) return Qtrue;

#endif
    return Qfalse;
}

blocks => integer or nil click to toggle source

Returns the number of native file system blocks allocated for this file, or nil if the operating system doesn't support this feature.

File.stat("testfile").blocks   #=> 2

 
               static VALUE
rb_stat_blocks(self)
    VALUE self;
{
#ifdef HAVE_ST_BLOCKS
    return ULONG2NUM(get_stat(self)->st_blocks);
#else
    return Qnil;
#endif
}

chardev? => true or false click to toggle source

Returns true if the file is a character device, false if it isn't or if the operating system doesn't support this feature.

File.stat("/dev/tty").chardev?   #=> true

 
               static VALUE
rb_stat_c(obj)
    VALUE obj;
{
    if (S_ISCHR(get_stat(obj)->st_mode)) return Qtrue;

    return Qfalse;
}

ctime → aTime click to toggle source

Returns the change time for stat (that is, the time directory information about the file was changed, not the file itself).

File.stat("testfile").ctime   #=> Wed Apr 09 08:53:14 CDT 2003

 
               static VALUE
rb_stat_ctime(self)
    VALUE self;
{
    return rb_time_new(get_stat(self)->st_ctime, 0);
}

dev => fixnum click to toggle source

Returns an integer representing the device on which stat resides.

File.stat("testfile").dev   #=> 774

 
               static VALUE
rb_stat_dev(self)
    VALUE self;
{
    return INT2NUM(get_stat(self)->st_dev);
}

dev_major => fixnum click to toggle source

Returns the major part of File_Stat#dev or nil.

File.stat("/dev/fd1").dev_major   #=> 2
File.stat("/dev/tty").dev_major   #=> 5

 
               static VALUE
rb_stat_dev_major(self)
    VALUE self;
{
#if defined(major)
    long dev = get_stat(self)->st_dev;
    return ULONG2NUM(major(dev));
#else
    return Qnil;
#endif
}

dev_minor => fixnum click to toggle source

Returns the minor part of File_Stat#dev or nil.

File.stat("/dev/fd1").dev_minor   #=> 1
File.stat("/dev/tty").dev_minor   #=> 0

 
               static VALUE
rb_stat_dev_minor(self)
    VALUE self;
{
#if defined(minor)
    long dev = get_stat(self)->st_dev;
    return ULONG2NUM(minor(dev));
#else
    return Qnil;
#endif
}

directory? => true or false click to toggle source

Returns true if stat is a directory, false otherwise.

File.stat("testfile").directory?   #=> false
File.stat(".").directory?          #=> true

 
               static VALUE
rb_stat_d(obj)
    VALUE obj;
{
    if (S_ISDIR(get_stat(obj)->st_mode)) return Qtrue;
    return Qfalse;
}

executable? => true or false click to toggle source

Returns true if stat is executable or if the operating system doesn't distinguish executable files from nonexecutable files. The tests are made using the effective owner of the process.

File.stat("testfile").executable?   #=> false

 
               static VALUE
rb_stat_x(obj)
    VALUE obj;
{
    struct stat *st = get_stat(obj);

#ifdef USE_GETEUID
    if (geteuid() == 0) {
        return st->st_mode & S_IXUGO ? Qtrue : Qfalse;
    }
#endif
#ifdef S_IXUSR
    if (rb_stat_owned(obj))
        return st->st_mode & S_IXUSR ? Qtrue : Qfalse;
#endif
#ifdef S_IXGRP
    if (rb_stat_grpowned(obj))
        return st->st_mode & S_IXGRP ? Qtrue : Qfalse;
#endif
#ifdef S_IXOTH
    if (!(st->st_mode & S_IXOTH)) return Qfalse;
#endif
    return Qtrue;
}

executable_real? => true or false click to toggle source

Same as executable?, but tests using the real owner of the process.

 
               static VALUE
rb_stat_X(obj)
    VALUE obj;
{
    struct stat *st = get_stat(obj);

#ifdef USE_GETEUID
    if (getuid() == 0) {
        return st->st_mode & S_IXUGO ? Qtrue : Qfalse;
    }
#endif
#ifdef S_IXUSR
    if (rb_stat_rowned(obj))
        return st->st_mode & S_IXUSR ? Qtrue : Qfalse;
#endif
#ifdef S_IXGRP
    if (group_member(get_stat(obj)->st_gid))
        return st->st_mode & S_IXGRP ? Qtrue : Qfalse;
#endif
#ifdef S_IXOTH
    if (!(st->st_mode & S_IXOTH)) return Qfalse;
#endif
    return Qtrue;
}

file? => true or false click to toggle source

Returns true if stat is a regular file (not a device file, pipe, socket, etc.).

File.stat("testfile").file?   #=> true

 
               static VALUE
rb_stat_f(obj)
    VALUE obj;
{
    if (S_ISREG(get_stat(obj)->st_mode)) return Qtrue;
    return Qfalse;
}

ftype => string click to toggle source

Identifies the type of stat. The return string is one of: “file'', “directory'', “characterSpecial'', “blockSpecial'', “fifo'', “link'', “socket'', or “unknown''.

File.stat("/dev/tty").ftype   #=> "characterSpecial"

 
               static VALUE
rb_stat_ftype(obj)
    VALUE obj;
{
    return rb_file_ftype(get_stat(obj));
}

gid => fixnum click to toggle source

Returns the numeric group id of the owner of stat.

File.stat("testfile").gid   #=> 500

 
               static VALUE
rb_stat_gid(self)
    VALUE self;
{
    return UINT2NUM(get_stat(self)->st_gid);
}

grpowned? => true or false click to toggle source

Returns true if the effective group id of the process is the same as the group id of stat. On Windows NT, returns false.

File.stat("testfile").grpowned?      #=> true
File.stat("/etc/passwd").grpowned?   #=> false

 
               static VALUE
rb_stat_grpowned(obj)
    VALUE obj;
{
#ifndef _WIN32
    if (group_member(get_stat(obj)->st_gid)) return Qtrue;
#endif
    return Qfalse;
}

ino => fixnum click to toggle source

Returns the inode number for stat.

File.stat("testfile").ino   #=> 1083669

 
               static VALUE
rb_stat_ino(self)
    VALUE self;
{
#ifdef HUGE_ST_INO
    return ULL2NUM(get_stat(self)->st_ino);
#else
    return ULONG2NUM(get_stat(self)->st_ino);
#endif
}

inspect => string click to toggle source

Produce a nicely formatted description of stat.

File.stat("/etc/passwd").inspect
   #=> "#<File::Stat dev=0xe000005, ino=1078078, mode=0100644, 
        nlink=1, uid=0, gid=0, rdev=0x0, size=1374, blksize=4096, 
        blocks=8, atime=Wed Dec 10 10:16:12 CST 2003, 
        mtime=Fri Sep 12 15:41:41 CDT 2003, 
        ctime=Mon Oct 27 11:20:27 CST 2003>"

 
               static VALUE
rb_stat_inspect(self)
    VALUE self;
{
    VALUE str;
    int i;
    static const struct {
        const char *name;
        VALUE (*func)_((VALUE));
    } member[] = {
        {"dev",            rb_stat_dev},
        {"ino",            rb_stat_ino},
        {"mode",    rb_stat_mode},
        {"nlink",   rb_stat_nlink},
        {"uid",            rb_stat_uid},
        {"gid",            rb_stat_gid},
        {"rdev",    rb_stat_rdev},
        {"size",    rb_stat_size},
        {"blksize", rb_stat_blksize},
        {"blocks",  rb_stat_blocks},
        {"atime",   rb_stat_atime},
        {"mtime",   rb_stat_mtime},
        {"ctime",   rb_stat_ctime},
    };

    str = rb_str_buf_new2("#<");
    rb_str_buf_cat2(str, rb_obj_classname(self));
    rb_str_buf_cat2(str, " ");

    for (i = 0; i < sizeof(member)/sizeof(member[0]); i++) {
        VALUE v;

        if (i > 0) {
            rb_str_buf_cat2(str, ", ");
        }
        rb_str_buf_cat2(str, member[i].name);
        rb_str_buf_cat2(str, "=");
        v = (*member[i].func)(self);
        if (i == 2) {          /* mode */
            char buf[32];

            sprintf(buf, "0%lo", NUM2ULONG(v));
            rb_str_buf_cat2(str, buf);
        }
        else if (i == 0 || i == 6) { /* dev/rdev */
            char buf[32];

            sprintf(buf, "0x%lx", NUM2ULONG(v));
            rb_str_buf_cat2(str, buf);
        }
        else {
            rb_str_append(str, rb_inspect(v));
        }
    }
    rb_str_buf_cat2(str, ">");
    OBJ_INFECT(str, self);

    return str;
}

mode => fixnum click to toggle source

Returns an integer representing the permission bits of stat. The meaning of the bits is platform dependent; on Unix systems, see stat(2).

File.chmod(0644, "testfile")   #=> 1
s = File.stat("testfile")
sprintf("%o", s.mode)          #=> "100644"

 
               static VALUE
rb_stat_mode(self)
    VALUE self;
{
#ifdef __BORLANDC__
    return UINT2NUM((unsigned short)(get_stat(self)->st_mode));
#else
    return UINT2NUM(get_stat(self)->st_mode);
#endif
}

mtime → aTime click to toggle source

Returns the modification time of stat.

File.stat("testfile").mtime   #=> Wed Apr 09 08:53:14 CDT 2003

 
               static VALUE
rb_stat_mtime(self)
    VALUE self;
{
    return rb_time_new(get_stat(self)->st_mtime, 0);
}

nlink => fixnum click to toggle source

Returns the number of hard links to stat.

File.stat("testfile").nlink             #=> 1
File.link("testfile", "testfile.bak")   #=> 0
File.stat("testfile").nlink             #=> 2

 
               static VALUE
rb_stat_nlink(self)
    VALUE self;
{
    return UINT2NUM(get_stat(self)->st_nlink);
}

owned? => true or false click to toggle source

Returns true if the effective user id of the process is the same as the owner of stat.

File.stat("testfile").owned?      #=> true
File.stat("/etc/passwd").owned?   #=> false

 
               static VALUE
rb_stat_owned(obj)
    VALUE obj;
{
    if (get_stat(obj)->st_uid == geteuid()) return Qtrue;
    return Qfalse;
}

pipe? => true or false click to toggle source

Returns true if the operating system supports pipes and stat is a pipe; false otherwise.

 
               static VALUE
rb_stat_p(obj)
    VALUE obj;
{
#ifdef S_IFIFO
    if (S_ISFIFO(get_stat(obj)->st_mode)) return Qtrue;

#endif
    return Qfalse;
}

rdev => fixnum or nil click to toggle source

Returns an integer representing the device type on which stat resides. Returns nil if the operating system doesn't support this feature.

File.stat("/dev/fd1").rdev   #=> 513
File.stat("/dev/tty").rdev   #=> 1280

 
               static VALUE
rb_stat_rdev(self)
    VALUE self;
{
#ifdef HAVE_ST_RDEV
    return ULONG2NUM(get_stat(self)->st_rdev);
#else
    return Qnil;
#endif
}

rdev_major => fixnum click to toggle source

Returns the major part of File_Stat#rdev or nil.

File.stat("/dev/fd1").rdev_major   #=> 2
File.stat("/dev/tty").rdev_major   #=> 5

 
               static VALUE
rb_stat_rdev_major(self)
    VALUE self;
{
#if defined(HAVE_ST_RDEV) && defined(major)
    long rdev = get_stat(self)->st_rdev;
    return ULONG2NUM(major(rdev));
#else
    return Qnil;
#endif
}

rdev_minor => fixnum click to toggle source

Returns the minor part of File_Stat#rdev or nil.

File.stat("/dev/fd1").rdev_minor   #=> 1
File.stat("/dev/tty").rdev_minor   #=> 0

 
               static VALUE
rb_stat_rdev_minor(self)
    VALUE self;
{
#if defined(HAVE_ST_RDEV) && defined(minor)
    long rdev = get_stat(self)->st_rdev;
    return ULONG2NUM(minor(rdev));
#else
    return Qnil;
#endif
}

readable? => true or false click to toggle source

Returns true if stat is readable by the effective user id of this process.

File.stat("testfile").readable?   #=> true

 
               static VALUE
rb_stat_r(obj)
    VALUE obj;
{
    struct stat *st = get_stat(obj);

#ifdef USE_GETEUID
    if (geteuid() == 0) return Qtrue;
#endif
#ifdef S_IRUSR
    if (rb_stat_owned(obj))
        return st->st_mode & S_IRUSR ? Qtrue : Qfalse;
#endif
#ifdef S_IRGRP
    if (rb_stat_grpowned(obj))
        return st->st_mode & S_IRGRP ? Qtrue : Qfalse;
#endif
#ifdef S_IROTH
    if (!(st->st_mode & S_IROTH)) return Qfalse;
#endif
    return Qtrue;
}

readable_real? → true or false click to toggle source

Returns true if stat is readable by the real user id of this process.

File.stat("testfile").readable_real?   #=> true

 
               static VALUE
rb_stat_R(obj)
    VALUE obj;
{
    struct stat *st = get_stat(obj);

#ifdef USE_GETEUID
    if (getuid() == 0) return Qtrue;
#endif
#ifdef S_IRUSR
    if (rb_stat_rowned(obj))
        return st->st_mode & S_IRUSR ? Qtrue : Qfalse;
#endif
#ifdef S_IRGRP
    if (group_member(get_stat(obj)->st_gid))
        return st->st_mode & S_IRGRP ? Qtrue : Qfalse;
#endif
#ifdef S_IROTH
    if (!(st->st_mode & S_IROTH)) return Qfalse;
#endif
    return Qtrue;
}

setgid? => true or false click to toggle source

Returns true if stat has the set-group-id permission bit set, false if it doesn't or if the operating system doesn't support this feature.

File.stat("/usr/sbin/lpc").setgid?   #=> true

 
               static VALUE
rb_stat_sgid(obj)
    VALUE obj;
{
#ifdef S_ISGID
    if (get_stat(obj)->st_mode & S_ISGID) return Qtrue;
#endif
    return Qfalse;
}

setuid? => true or false click to toggle source

Returns true if stat has the set-user-id permission bit set, false if it doesn't or if the operating system doesn't support this feature.

File.stat("/bin/su").setuid?   #=> true

 
               static VALUE
rb_stat_suid(obj)
    VALUE obj;
{
#ifdef S_ISUID
    if (get_stat(obj)->st_mode & S_ISUID) return Qtrue;
#endif
    return Qfalse;
}

size => fixnum click to toggle source

Returns the size of stat in bytes.

File.stat("testfile").size   #=> 66

 
               static VALUE
rb_stat_size(self)
    VALUE self;
{
    return OFFT2NUM(get_stat(self)->st_size);
}

size => integer click to toggle source

Returns the size of stat in bytes.

File.stat("testfile").size   #=> 66

 
               static VALUE
rb_stat_s(obj)
    VALUE obj;
{
    off_t size = get_stat(obj)->st_size;

    if (size == 0) return Qnil;
    return OFFT2NUM(size);
}

socket? => true or false click to toggle source

Returns true if stat is a socket, false if it isn't or if the operating system doesn't support this feature.

File.stat("testfile").socket?   #=> false

 
               static VALUE
rb_stat_S(obj)
    VALUE obj;
{
#ifdef S_ISSOCK
    if (S_ISSOCK(get_stat(obj)->st_mode)) return Qtrue;

#endif
    return Qfalse;
}

sticky? => true or false click to toggle source

Returns true if stat has its sticky bit set, false if it doesn't or if the operating system doesn't support this feature.

File.stat("testfile").sticky?   #=> false

 
               static VALUE
rb_stat_sticky(obj)
    VALUE obj;
{
#ifdef S_ISVTX
    if (get_stat(obj)->st_mode & S_ISVTX) return Qtrue;
#endif
    return Qfalse;
}

symlink? => true or false click to toggle source

Returns true if stat is a symbolic link, false if it isn't or if the operating system doesn't support this feature. As File::stat automatically follows symbolic links, symlink? will always be false for an object returned by File::stat.

File.symlink("testfile", "alink")   #=> 0
File.stat("alink").symlink?         #=> false
File.lstat("alink").symlink?        #=> true

 
               static VALUE
rb_stat_l(obj)
    VALUE obj;
{
#ifdef S_ISLNK
    if (S_ISLNK(get_stat(obj)->st_mode)) return Qtrue;
#endif
    return Qfalse;
}

uid => fixnum click to toggle source

Returns the numeric user id of the owner of stat.

File.stat("testfile").uid   #=> 501

 
               static VALUE
rb_stat_uid(self)
    VALUE self;
{
    return UINT2NUM(get_stat(self)->st_uid);
}

writable? → true or false click to toggle source

Returns true if stat is writable by the effective user id of this process.

File.stat("testfile").writable?   #=> true

 
               static VALUE
rb_stat_w(obj)
    VALUE obj;
{
    struct stat *st = get_stat(obj);

#ifdef USE_GETEUID
    if (geteuid() == 0) return Qtrue;
#endif
#ifdef S_IWUSR
    if (rb_stat_owned(obj))
        return st->st_mode & S_IWUSR ? Qtrue : Qfalse;
#endif
#ifdef S_IWGRP
    if (rb_stat_grpowned(obj))
        return st->st_mode & S_IWGRP ? Qtrue : Qfalse;
#endif
#ifdef S_IWOTH
    if (!(st->st_mode & S_IWOTH)) return Qfalse;
#endif
    return Qtrue;
}

writable_real? → true or false click to toggle source

Returns true if stat is writable by the real user id of this process.

File.stat("testfile").writable_real?   #=> true

 
               static VALUE
rb_stat_W(obj)
    VALUE obj;
{
    struct stat *st = get_stat(obj);

#ifdef USE_GETEUID
    if (getuid() == 0) return Qtrue;
#endif
#ifdef S_IWUSR
    if (rb_stat_rowned(obj))
        return st->st_mode & S_IWUSR ? Qtrue : Qfalse;
#endif
#ifdef S_IWGRP
    if (group_member(get_stat(obj)->st_gid))
        return st->st_mode & S_IWGRP ? Qtrue : Qfalse;
#endif
#ifdef S_IWOTH
    if (!(st->st_mode & S_IWOTH)) return Qfalse;
#endif
    return Qtrue;
}

zero? => true or false click to toggle source

Returns true if stat is a zero-length file; false otherwise.

File.stat("testfile").zero?   #=> false

 
               static VALUE
rb_stat_z(obj)
    VALUE obj;
{
    if (get_stat(obj)->st_size == 0) return Qtrue;
    return Qfalse;
}

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