First of all, please believe that I spent almost three hours going through the mailing list archives before asking this. It's just that I (and many others) have not been able to find a solution there.
I'm not running a program that tests for rootness in some non-portable way. I'm just calling an innocent ioctl directly into cygwin, which tells me I need more permissions. Just for clarification, here is the problem code: ioctl(fd,TIOCMGET,&status); status &= ~TIOCM_RTS; ioctl(fd, TIOCMSET, &status); // returns -EPERM Apart from having a privileged (administrator) windows account, should I understand (from http://cygwin.com/cygwin-ug-net/ntsec.html) that all cygwin asks for is that I should get things right in /etc/passwd and /etc/group? Please take a look at what I've tried so far: in /etc/passwd: (original) jorge:*:1008:513:Jorge,U-QUICKSILVER\jorge,S-1-5-21-1450639292-781126914-3756273746-1008:/home/jorge:/bin/bash (1st try) jorge:*:1008:544:Jorge,U-QUICKSILVER\jorge,S-1-5-21-1450639292-781126914-3756273746-1008:/home/jorge:/bin/bash (2nd try) jorge:*:100:0:Jorge,U-QUICKSILVER\jorge,S-1-5-21-1450639292-781126914-3756273746-1008:/home/jorge:/bin/bash (3rd try) jorge:*:0:0:Jorge,U-QUICKSILVER\jorge,S-1-5-21-1450639292-781126914-3756273746-1008:/home/jorge:/bin/bash in /etc/group (for the 2nd and 3rd tries above, I added the following line): root:S-1-5-32-544:0: Finally, I even tried running the program from a "SYSTEM-owned shell", to no avail. Thanks in advance for any pointers. Cheers, Jorge. Jorge Marques Pelizzoni escreveu: > > Hi all! > > I am developing a program that requires root privileges to run (e.g. it > calls ioctl to set communication lines at a serial port). Even though I am > an administrator of my WinXP workstation, cygwin keeps giving me EPERM. > Ok, I've read: > > http://cygwin.com/cygwin-ug-net/ntsec.html#ntsec-mapping > > but wasn't able to sove my problem anyway. I even tried changing my user > group from 513 to 544 in /dev/passwd by directly editing this file... > > I'd rather not change the program (as it runs fine on linux) but just be > recognized as root to have it going on Windows. Is that possible? > > Thanks in advance. Cheers, > > Jorge. > > -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/