Hi Jon, On Sun, Apr 22, 2012 at 11:17 PM, Jon Grant <jg@xxxxxxxx> wrote: > Hello > > Quoting from this page: > > http://man7.org/linux/man-pages/man3/errno.3.html > > "a function that succeeds is allowed to change errno." > > ^ This sounds clear, e.g. open() can change errno to 0, when it returns a > valid fd handle. > > > "Valid error numbers are all nonzero; errno is never set to zero by any > system > call or library function." > > ^ This seems to be counter what the earlier line said. Therefore, open() > wouldn't be allowed to change errno to 0. > > Have I missed something? I don't really see the problem. The first part says functions may change errno. The second part adds a qualification; they'll never change it to zero. Cheers, Michael -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Author of "The Linux Programming Interface"; http://man7.org/tlpi/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
