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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LEARN ABOUT MOJAVE
mkpath_np
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