1. Forum
  2. DOVE-Net
  3. Synchronet Programming

  • src/xpdev/filewrap.c

    From Deuc¿@VERT to Git commit to main/sbbs/master on Sunday, March 15, 2026 16:01:53
    https://gitlab.synchro.net/main/sbbs/-/commit/e4122aa602189ce9e5154c56
    Modified Files:
    src/xpdev/filewrap.c
    Log Message:
    Remove vestigial (int) casts truncating off_t lock length

    Both lock() and unlock() cast the off_t len parameter to int before
    assigning to alock.l_len (which is off_t). The cast silently
    truncates lock lengths on files > 2GB. Both sides are already off_t,
    so the cast is unnecessary.

    Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

    ---
    þ Synchronet þ Vertrauen þ Home of Synchronet þ [vert/cvs/bbs].synchro.net
  • From Rob Swindell (on Windows 11)@VERT to Git commit to main/sbbs/master on Wednesday, June 03, 2026 09:44:35
    https://gitlab.synchro.net/main/sbbs/-/commit/e3fd4e7cf195c14e9e12c577
    Modified Files:
    src/xpdev/filewrap.c
    Log Message:
    xpdev/filewrap: flock path of xp_lockfile() honors fd open mode too (#1153)

    The non-Linux POSIX (flock) path of xp_lockfile() always took LOCK_EX,
    even for a read-only descriptor, unlike the Linux/fcntl path which
    derives the lock type from the fd's open mode. So on FreeBSD/macOS/etc. (USE_FCNTL_LOCKS is Linux-only) a read-only lock() serialized concurrent readers - the same exclusive-lock-on-reads issue fixed for Windows in the previous commit. flock() (unlike fcntl()) isn't forced to a lock type by
    the access mode, so the LOCK_EX was a choice; mirror the fcntl path and
    take LOCK_SH for an O_RDONLY fd.

    The user.tab read path is already covered on these platforms (rdlock()'s
    flock branch uses LOCK_SH); this brings the lock() primitive itself to
    parity, so any read-only-fd caller benefits. flock remains whole-file
    (pos/len ignored) - a pre-existing coarseness, unchanged here.

    Not compiled in this environment (the flock branch builds only on
    non-Linux POSIX); mirrors the existing fcntl-branch idiom.

    Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

    ---
    þ Synchronet þ Vertrauen þ Home of Synchronet þ [vert/cvs/bbs].synchro.net