Hi!
24-Авг-2006 23:42 [EMAIL PROTECTED] (Diego Rodriguez) wrote to freedos-devel
<[email protected]>:
DR> Turbo C chmod function fails under FreeDOS when you try to change
DR> permissions of a directory, e.g.
DR> chmod (path, S_IREAD|S_IWRITE) fails and return -1, but it works under
DR> DR DOS.
This, probably, feature of DR-DOS, but under MS-DOS and FreeDOS you
can't sett attributes of directory without clearing DIRECTORY bit. See RBIL:
______________O\_/_________________________________\_/O______________
Notes: will not change volume label or directory attribute bits, but will
change the other attribute bits of a directory (the directory
bit must be cleared to successfully change the other attributes of a
directory, but the directory will not be changed to a normal file as
a result)
_____________________________________________________________________
O/~\ /~\O
Borland's chmod() is implemented so (slightly changed source from BC RTL):
______________O\_/_________________________________\_/O______________
int chmod (const char *name, int permiss) {
int attrib = _chmod (name, 0);
if (attrib == -1) return -1;
attrib &= ~FA_RDONLY;
if ((permiss & S_IWRITE) == 0) attrib |= FA_RDONLY;
if (_chmod (name, 1, attrib) == -1)
return -1;
return 0;
}
_____________________________________________________________________
O/~\ /~\O
Thus, unfortunately, Borland's chmod() is inapplicable for directories, so
use _chmod() or _dos_setfileattr() directly. For example:
______________O\_/_________________________________\_/O______________
#include <stdio.h>
#include <dos.h>
#include <io.h>
#include <errno.h>
int main (void) {
int attrib = _chmod ("TEST", 0);
if (attrib == -1) return printf ("error: _chmod(0) (errno: %u)\n", errno);
attrib &= ~FA_RDONLY;
if (_chmod ("TEST", 1, attrib & ~_A_SUBDIR) == -1)
/*------------------------------^^^^^^^^^^^^*/
return printf ("error: _chmod(1) (errno: %u)\n", errno);
return printf ("Ok.\n");
}
_____________________________________________________________________
O/~\ /~\O
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