A NOTE has been added to this issue. ====================================================================== https://austingroupbugs.net/view.php?id=1832 ====================================================================== Reported By: alanc Assigned To: ====================================================================== Project: Issue 8 drafts Issue ID: 1832 Category: System Interfaces Type: Enhancement Request Severity: Comment Priority: normal Status: New Name: Alan Coopersmith Organization: User Reference: Section: System Interfaces Page Number: (page or range of pages) Line Number: (Line or range of lines) Final Accepted Text: ====================================================================== Date Submitted: 2024-05-24 21:48 UTC Last Modified: 2024-05-26 02:43 UTC ====================================================================== Summary: Add preadv() and pwritev() ======================================================================
---------------------------------------------------------------------- (0006805) Guy Harris (reporter) - 2024-05-26 02:43 https://austingroupbugs.net/view.php?id=1832#c6805 ---------------------------------------------------------------------- > and even to have a future direction that they be forbidden from being cancellation points. Given that macOS has both "preadv" and "preadv_nocancel" system calls, and that the GNU libc used in most Linux systems has both "preadv()" and "__preadv_nocancel()" routines, it's likely that "preadv()" is a cancellation point on both those OSes, so that might cause problems. Furthermore, on both those OSes (and most if not all other UN*Xes), "slow" operation scan occur on special files other than ttys, *and* those special files might use the seek offset, so there might well be cases where making pthreadv() not a cancellation point would cause problems, even if it doesn't cause problems for POSIX-conformant programs. So I would recommend against that. Instead, if there is a demand for non-cancellation-point calls, I would recommend, for a future direction, that _nocancel versions of calls be added. I don't know why neither macOS nor GNU(libc)/Linux provide _nocanncel versions of those APIs, but, other than the namespace pollution issues, it would be trivial to provide them, at least in those OSes. Issue History Date Modified Username Field Change ====================================================================== 2024-05-24 21:48 alanc New Issue 2024-05-24 21:48 alanc Name => Alan Coopersmith 2024-05-24 21:48 alanc Section => System Interfaces 2024-05-24 21:48 alanc Page Number => (page or range of pages) 2024-05-24 21:48 alanc Line Number => (Line or range of lines) 2024-05-24 21:56 Guy Harris Note Added: 0006800 2024-05-25 23:10 alanc Note Added: 0006803 2024-05-26 00:03 philip-guentherNote Added: 0006804 2024-05-26 02:43 Guy Harris Note Added: 0006805 ======================================================================
