Messages in this thread | | | Subject | mmap of readonly file (was Re: sendfile(2) idea) | Date | Sun, 12 Jul 1998 12:22:55 -0700 | From | Stephen Williams <> |
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stefan@sime.com said: > open("./page", O_RDONLY) = 3 > mmap(0, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE, 3, 0) = 0x400ad000
> I don't have a POSIX copy here; but PROT_WRITE on a O_RDONLY fd should > IMHO fail...
Try again with MAP_SHARED instead of MAP_PRIVATE. Also, try writing to your private mapped region and seeing what (if anything) happens to the file. Do the same test with MAP_SHARED. -- Steve Williams "The woods are lovely, dark and deep. steve@icarus.com But I have promises to keep, steve@picturel.com and lines to code before I sleep, http://www.picturel.com And lines to code before I sleep."
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