On 28.08.2016 4:04, Andrey Chernov wrote: > On 28.08.2016 3:56, Konstantin Belousov wrote: >> On Sun, Aug 28, 2016 at 03:38:10AM +0300, Andrey Chernov wrote: >>> On 28.08.2016 2:03, Konstantin Belousov wrote: >>>> Since ptrace(2) syscall can return -1 for non-error situations, libc >>>> wrappers set errno to 0 before performing the syscall, as the service >>>> to the caller. >>> >>> Both C99 and POSIX directly prohibits any standard function to set errno >>> to 0. ptrace() should either choose other errno to indicate non-error >>> situation or change return -1 to something else. >>> >> ptrace(2) is not a standard function. >> > > C99 statement sounds stricter: > "The value of errno is zero at program startup, but is never set to zero > by any library function. 176)" > And syscall is not different from library function from C99 point of view. >
>> And, we cannot break ABI for the syscall. We can fix already broken (from standards point of view) ABI for the syscall. _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
