Re^2: "readdir() attempted on invalid dirhandle" error?

> Linux lets you open a directory as a file without an error, but then you can't do anything with it.

You can do something.

open my $d, '<', '..' or die $!;  # Doesn't die.
say -e $d;                        # 1.
say -d $d;                        # 1.
say -f $d;                        # Nothing.
chdir $d or die $!;               # Switches to the parent directory (
+read "perldoc -f chdir").
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map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

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chdir FILEHANDLE by parv (Parson) on Jul 10, 2024 at 21:47 UTC
From chdir function ... `... chdir FILEHANDLE chdir DIRHANDLE ... On systems that support fchdir(2), you may pass a filehandle or dire +ctory handle as the argument. On systems that don't support fchdir(2) +, passing handles raises an exception.` [download] ... `fchdir(2)` ought to be present on POSIX-conforming systems, from "fchdir(2)" manual page of FreeBSD 14 ... `... STANDARDS The chdir() system call is expected to conform to IEEE Std 1003.1 +-1990 (“POSIX.1”). HISTORY The chdir() system call appeared in Version 1 AT&T UNIX. The fchdir( +) system call appeared in 4.2BSD.` [download]	[reply] [d/l] [select]

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chdir FILEHANDLE
by parv (Parson) on Jul 10, 2024 at 21:47 UTC

chdir

...
chdir FILEHANDLE
chdir DIRHANDLE
...
  On systems that support fchdir(2), you may pass a filehandle or dire
+ctory handle as the argument. On systems that don't support fchdir(2)
+, passing handles raises an exception.
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... fchdir(2) ought to be present on POSIX-conforming systems, from "fchdir(2)" manual page of FreeBSD 14 ...

...
STANDARDS
     The chdir() system call is expected to conform to IEEE Std 1003.1
+-1990 (“POSIX.1”).

HISTORY
  The chdir() system call appeared in Version 1 AT&T UNIX. The fchdir(
+) system call appeared in 4.2BSD.
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