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Full Discussion: Struggling with mkfifo
Top Forums UNIX for Dummies Questions & Answers Struggling with mkfifo Post 50033 by Perderabo on Thursday 15th of April 2004 12:03:00 PM
Old 04-15-2004
mkdir() preceded posix. When mknod() creates a directory, it is truly emply. It takes two link() calls to create the . and .. entries. This leaves a window where the directory has an illegal structure. This caused race conditions and if the program died before the link calls succeeded, the filesystem was left in an illegal state. Ordinary users had to invoke a suid program to make directories, in part to ensure that the links were at least attempted.

That's why the mkdir() system call was created...it atomically creates a valid directory in one system call. And user programs can invoke it. The mkdir utility no longer needs to be suid.

mknod() has been deprecated for creating directories for some time.
 

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LFC-MKDIR(1)							 LFC User Commands						      LFC-MKDIR(1)

NAME
lfc-mkdir - make LFC directory in the name server SYNOPSIS
lfc-mkdir [-m mode] [-p] path... DESCRIPTION
lfc-mkdir creates the specified LFC directories in the name server. This requires write permission in the parent directory. The owner ID and group ID of the new directories are set to the requestor's real user ID and group ID, respectively. path specifies the LFC pathname. If path does not start with /, it is prefixed by the content of the LFC_HOME environment variable. The lfc-mkdir command has the following options: -m specifies the mode to be used. Default mode is 777. -p creates all the non-existing parent directories first. The mode set for the created intermediate directories is the logical differ- ence between 0777 and the user umask but at least 0300. EXIT STATUS
This program returns 0 if the operation was successful or >0 if the operation failed. SEE ALSO
Castor_limits(4), lfc_chmod(3), lfc_mkdir(3), lfc_umask(3) AUTHOR
LCG Grid Deployment Team LFC
$Date: 2001/10/04 12:12:54 $ LFC-MKDIR(1)
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