Date: Sat, 4 Jan 2014 21:55:06 +0000 (UTC) From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r260290 - head/sys/sys Message-ID: <201401042155.s04Lt6HY020533@svn.freebsd.org>
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Author: pjd Date: Sat Jan 4 21:55:06 2014 New Revision: 260290 URL: http://svnweb.freebsd.org/changeset/base/260290 Log: Bring back the old size of the kinfo_file structure to preserve ABI. Keep only one uint64_t spare for further cap_rights_t expension. Add a comment clarifying that if the size of this structure changes, a new sysctl MIB has to be allocate for it and the old structure has to be returned by the old sysctl MIB. Requested by: re MFC after: 3 days Modified: head/sys/sys/user.h Modified: head/sys/sys/user.h ============================================================================== --- head/sys/sys/user.h Sat Jan 4 21:45:52 2014 (r260289) +++ head/sys/sys/user.h Sat Jan 4 21:55:06 2014 (r260290) @@ -320,7 +320,13 @@ struct kinfo_ofile { }; #if defined(__amd64__) || defined(__i386__) -#define KINFO_FILE_SIZE 1424 +/* + * This size should never be changed. If you really need to, you must provide + * backward ABI compatibility by allocating a new sysctl MIB that will return + * the new structure. The current structure has to be returned by the current + * sysctl MIB. See how it is done for the kinfo_ofile structure. + */ +#define KINFO_FILE_SIZE 1392 #endif struct kinfo_file { @@ -391,8 +397,7 @@ struct kinfo_file { uint16_t kf_pad1; /* Round to 32 bit alignment. */ int _kf_ispare0; /* Space for more stuff. */ cap_rights_t kf_cap_rights; /* Capability rights. */ - uint64_t _kf_cap_spare[3]; /* Space for future cap_rights_t. */ - int _kf_ispare[4]; /* Space for more stuff. */ + uint64_t _kf_cap_spare; /* Space for future cap_rights_t. */ /* Truncated before copyout in sysctl */ char kf_path[PATH_MAX]; /* Path to file, if any. */ };
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