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Top Forums Programming How to read flags from mode_t type? Post 302264839 by shamrock on Friday 5th of December 2008 03:02:44 AM
Old 12-05-2008
Quote:
Originally Posted by pallak7
I think I may have it figured out. Is this correct:
Code:
if((perms->st_mode & S_IRWXO) && S_IROTH != 1) then return an error

to check if a file is world-readable and return an error if it's not? That's really the only permission I care about.
If you care only about world-writeable files then and'ing with S_IWOTH is all you need...
Code:
if (!(perms->st_mode & S_IWOTH))
        return (error if file is not world-writeable);

 

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umask(2)							   System Calls 							  umask(2)

NAME
umask - set and get file creation mask SYNOPSIS
#include <sys/types.h> #include <sys/stat.h> mode_t umask(mode_t cmask); DESCRIPTION
The umask() function sets the process's file mode creation mask to cmask and returns the previous value of the mask. Only the access per- mission bits of cmask and the file mode creation mask are used. The mask is inherited by child processes. See Intro(2) for more information on masks. RETURN VALUES
The previous value of the file mode creation mask is returned. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Async-Signal-Safe | +-----------------------------+-----------------------------+ SEE ALSO
mkdir(1), sh(1), Intro(2), chmod(2), creat(2), mknod(2), open(2), stat.h(3HEAD), attributes(5), standards(5) SunOS 5.11 28 Dec 1996 umask(2)
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