On Tuesday 25 November 2008 18:37:50 Alexej Sokolov wrote: > Hello, > could anyone please explain to me the difference between functions: > copystr() and copyinstr() ? > > For i386 copyinstr is implemented in assembler. I can not read > the assembler code very well. > > I tried to allocate a memory in space of user process using vm_map_find > and then with copystr() I could copy data between user and kernel > memory. copystr() seemed to be able to do the same what copyinstr do.
You might get lucky with copystr() if the user page is already resident, but if you page fault copystr() will kill the kernel. copyinstr() handles page faults. -- /"\ Best regards, | [EMAIL PROTECTED] \ / Max Laier | ICQ #67774661 X http://pf4freebsd.love2party.net/ | [EMAIL PROTECTED] / \ ASCII Ribbon Campaign | Against HTML Mail and News _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
