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Top Forums UNIX for Dummies Questions & Answers From iOS programming to Linux system programming Post 302796843 by Rockatansky on Sunday 21st of April 2013 01:49:21 AM
Old 04-21-2013
From iOS programming to Linux system programming

Hello.
I like Linux and C programming language. Allways wanted to understand kernel and become a Linux system programmer. And I also like Objective-C and iOS. These two programming areas have relations:
1. Linux and iOS are UNIX-like systems, POSIX compliant.
2. It is useful to know C language for iOS programmer.

And I have these questions:
1) Is it useful for usual iOS web/GUI/game programmer to know UNIX/FreeBSD programming?
2) Is it useful for usual iOS web/GUI/game programmer to know iOS kernel and iOS system programming?
3) Is it difficult to transit from iOS programming to Linux system programming?
 

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mkpath_np(3)						   BSD Library Functions Manual 					      mkpath_np(3)

NAME
mkpath_np -- Auxiliary routine for efficiently creating paths SYNOPSIS
#include <unistd.h> int mkpath_np(const char * path, mode_t omode); DESCRIPTION
This routine allows the caller to create a path, including intermediate directories. It is equivalent to calling mkdir(1) with the -p com- mand line argument. Intermediate directories are created with permission bits of rwxrwxrwx (0777) as modified by the current umask, plus write and search permis- sion for the owner. The leaf directory is created with permission bits of omode as modified by the current umask. RETURN VALUES
A 0 return value indicates success. If an error occurs, the return value is a non-zero error code. Note that EEXIST is returned iff the leaf directory already exists and is a directory, so under certain circumstances, this error value may not indicate a failure state. This routine does NOT modify errno. ERRORS
Any error code that can be returned by mkdir(2) can be returned by mkpath_np(), but mkpath_np() will return the error code rather than set- ting errno. [ENOTDIR] A component of the path is not a directory (in contrast to mkdir(2) which returns this based on the path prefix rather than the path). [EEXIST] The path already exists and is a directory. HISTORY
This function first appeared in iOS 5.0. SEE ALSO
mkdir(1), chmod(2), mkdir(2) Mac OS X July 13, 2011 Mac OS X
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