Date: Tue, 14 Apr 2020 15:27:25 +0000 (UTC) From: "Jonathan T. Looney" <jtl@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r359921 - head/sys/sys Message-ID: <202004141527.03EFRPMw055694@repo.freebsd.org>
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Author: jtl Date: Tue Apr 14 15:27:24 2020 New Revision: 359921 URL: https://svnweb.freebsd.org/changeset/base/359921 Log: Make the path length of UNIX domain sockets specified by a #define. Also, add a comment describing the historical context for this length. Reviewed by: bz, jhb, kbowling (previous version) MFC after: 2 weeks Sponsored by: Netflix, Inc. Differential Revision: https://reviews.freebsd.org/D24272 Modified: head/sys/sys/un.h Modified: head/sys/sys/un.h ============================================================================== --- head/sys/sys/un.h Tue Apr 14 14:48:00 2020 (r359920) +++ head/sys/sys/un.h Tue Apr 14 15:27:24 2020 (r359921) @@ -44,12 +44,20 @@ typedef __sa_family_t sa_family_t; #endif /* + * Historically, (struct sockaddr) needed to fit inside an mbuf. + * For this reason, UNIX domain sockets were therefore limited to + * 104 bytes. While this limit is no longer necessary, it is kept for + * binary compatibility reasons. + */ +#define SUNPATHLEN 104 + +/* * Definitions for UNIX IPC domain. */ struct sockaddr_un { unsigned char sun_len; /* sockaddr len including null */ sa_family_t sun_family; /* AF_UNIX */ - char sun_path[104]; /* path name (gag) */ + char sun_path[SUNPATHLEN]; /* path name (gag) */ }; #if __BSD_VISIBLE
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