quang@CSUFRES.CSUFRESNO.EDU (Quang Ngo) (04/22/91)
The man page section 2 says that only super-user can access mknod(). Is
there any other funtion that does what mknod() does? Our system doesn't
have fifo(). /etc/mknod is not accessable by users. Too bad, I can't
even do a system("/etc/mknod ....") call.
Any suggestions?
-Quang (quang@csufres.CSUFresno.EDU)jik@athena.mit.edu (Jonathan I. Kamens) (04/22/91)
Are you trying to use mknod to create a named pipe or fifo? If so, then that's yur problem. BSD 4.3 does not support them. The "mknod" program under BSD 4.3 can only be used to make special devices, not named pipes or fifos. Jonathan Kamens USnail: MIT Project Athena 11 Ashford Terrace jik@Athena.MIT.EDU Allston, MA 02134 Office: 617-253-8085 Home: 617-782-0710
jmason@gpu.utcs.utoronto.ca (Jamie Mason) (04/22/91)
In article <9104220651.AA13912@csufres.CSUFresno.EDU> quang@CSUFRES.CSUFRESNO.EDU (Quang Ngo) writes: >The man page section 2 says that only super-user can access mknod(). Is >there any other funtion that does what mknod() does? Our system doesn't >have fifo(). /etc/mknod is not accessable by users. Too bad, I can't >even do a system("/etc/mknod ....") call. I would be very surprised if the manual is correct, then. On systems with named pipes, mknod() is not usually a root-only call. Rather, you can call mknod(), but mknod() will return EACESS if you try to make a device with it. This is from the MKNOD(2) man page of SunOS 4.1.1: mknod() may be invoked only by the super-user for file types other than FIFO special. SunOS is of the BSD flavour -- so I would expect that 4.3BSD would act in basically the same way. Why not try an mknod() call and see if you get your named pipe? As for /usr/etc/mknod, that is just local policy, isn't it? Even if it *were* acessible to all users, I doubt it would be suid root, therefore whether you use that, or a program of your own creation, is irrelevant. mknod(8) (the program) is just a stupid thing wrapper around mknod(2) (the system call). Jamie ... Segmentation fault (core dumped) Written On Monday, April 22, 1991 at 03:50:16am EDT
guy@auspex.auspex.com (Guy Harris) (04/24/91)
> SunOS is of the BSD flavour SunOS is actually more like Neapolitan. :-) (Actually, the version of that joke that I saw described AIX in those terms, but....) I.e., it's of *several* flavors; it has some BSD stuff, some S5 stuff, and some SunOS stuff. ("Neapolitan" being a term used, at least in the US, to refer to ice cream with vanilla, chocolate, and strawberry regions.) >-- so I would expect that 4.3BSD would act in basically the same way. Nope. The fact that "mknod()" makes FIFOs comes from the S5 chunk of the ice cream bar, not the 4.3BSD chunk.