how to simulate "mkdir -p /home/blah1/blah2/blah3" in "c" where only /home exist Post: 302359450

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Top Forums Programming how to simulate "mkdir -p /home/blah1/blah2/blah3" in "c" where only /home exist Post 302359450 by achenle on Tuesday 6th of October 2009 02:55:30 PM

10-06-2009

Registered User

Quote:

Originally Posted by emitrax

The best way is probably to iterate and call mkdir and chdir every time.
I'm actually in the process of doing something similar, and that's the way I'll go.
Constructing the (full) path every time is quite annoying, while changing the working
directory should be more easy.

S.

That solution introduces an effect that impacts the entire process it's running in: the changing of the current directory.

If you do something like that you will then have what's almost certainly an undocumented and definitely an unnecessary dependency on the internal implementation of what should in theory be reusable code. Unless you fully document all the internals of such calls, then you'll only have an unnecessary dependency.

And you'll outright break multithreaded apps because threads other than the one calling a mkdir() call that changes the current directory will have the current directory modified right out from under their processing.

achenle

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LEARN ABOUT MINIX

chdir

CHDIR(2)							System Calls Manual							  CHDIR(2)

NAME

       chdir - change current working directory

SYNOPSIS

       #include <unistd.h>

       int chdir(const char *path)

DESCRIPTION

       Path  is  the  pathname	of  a directory.  Chdir causes this directory to become the current working directory, the starting point for path
       names not beginning with ``/''.

       In order for a directory to become the current directory, a process must have execute (search) access to the directory.

RETURN VALUE

       Upon successful completion, a value of 0 is returned.  Otherwise, a value of -1 is returned and errno is set to indicate the error.

ERRORS

       Chdir will fail and the current working directory will be unchanged if one or more of the following are true:

       [ENOTDIR]      A component of the path prefix is not a directory.

       [ENAMETOOLONG] The path name exceeds PATH_MAX characters.

       [ENOENT]       The named directory does not exist.

       [ELOOP]	      Too many symbolic links were encountered in translating the pathname.  (Minix-vmd)

       [EACCES]       Search permission is denied for any component of the path name.

       [EFAULT]       Path points outside the process's allocated address space.

       [EIO]	      An I/O error occurred while reading from or writing to the file system.

SEE ALSO

       chroot(2).

4th Berkeley Distribution					  August 26, 1985							  CHDIR(2)