Umask.cpp

/**
 * \file  Umask.cpp
 * \brief https://support.sas.com/documentation/onlinedoc/sasc/doc/lr2/umask.htm
 *
 * \review
 */


#include <StdStream/StdStream.h>
#include <StdTest/StdTest.h>
#include <Stl.h>

#include <sys/types.h>
#include <sys/stat.h>
//-------------------------------------------------------------------------------------------------
int main(int, char **)
{
#if 0
	mode_t old_mask = umask( 011 );

	open( ... );

	umask old_mask);
#endif

	mode_t oldMask {};
	mode_t newMask {};

	// Get old mask, temporarily setting the mask to 0
	oldMask = ::umask( static_cast<mode_t>(0) );

	// Print old mask. Octal values are used by mask
	printf("Old mask = %o\n", static_cast<int>(oldMask));

	// Make sure group read permission is allowed
	if (oldMask & S_IRGRP) {
		printf("Changing group read permission from MASKED to UNMASKED.\n");
		oldMask = (oldMask ^ S_IRGRP);
	}

	// Make sure group write and execute permission is not allowed.
	newMask = (oldMask | S_IWGRP | S_IXGRP);

	// Update mask
	::umask(newMask);

	// Print new mask
	printf("New mask = %o\n\n", (int) newMask);

	printf("The file mode creation mask now specifies:\n\n");
	printf("	Group read permission      UNMASKED\n");
	printf("	Group write permission     MASKED\n");
	printf("	Group execute permission   MASKED\n");

    return EXIT_SUCCESS;
}
//-------------------------------------------------------------------------------------------------


#if OUTPUT

Old mask = 2
New mask = 32

The file mode creation mask now specifies:

	Group read permission      UNMASKED
	Group write permission     MASKED
	Group execute permission   MASKED

#endif