espo@bpa.UUCP (11/08/83)
I know that a while ago, someone defined what the dup2() command does. UNIX 4.0 USG doesn't have this available within it's repertoire. Can someone answer ?? Thanks in advance, Bob Esposito...bpa!espo
jreuter@cincy.UUCP (11/12/83)
In UNIX 4.0USG, the dup2() system call should be replaced with the fcntl( fildes, F_DUPFD, arg ) system call if 4.0USG is anything like the released system III. Jim Reuter (decvax!cincy!jreuter)
nrf@whuxle.UUCP (11/20/83)
#R:bpa:-19200:whuxle:20900001:000:290 whuxle!npl Nov 10 00:38:00 1983 I happen to be looking at the page for dup(2) in a 5.0 manual right now. It's there. There are just too many programs which will break (including the shell) if you remove this system call. Not wixhing to be facetious, but mayhaps our manual has a page missing? ...!harpo!whuxle!npl -- Neal Fildes A.T.&T. - Bell Laboratories Whippany, NJ, U.S.A.
donn@hp-dcd.UUCP (11/23/83)
#R:bpa:-19200:hp-dcd:3200004:000:408 hp-dcd!donn Nov 16 09:42:00 1983 On dup2(). A emulation using fcntl and F_DUPFD was suggested, but it doesn't always work. If you read dup2() documentation carefully it does a dup to *exactly* its argument, doing a close if necessary. Fcntl does it to the first available slot >= its argument. Thus the suggested emulation doesn't always work. The emulation is: close(arg); fcntl(fd, F_DUPFD, arg); Donn Terry ...hplabs!hp-dcd!donn