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Annotation of 43BSDReno/share/doc/smm/13.kchanges/h.t, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1986 Regents of the University of California.
        !             2: .\" All rights reserved.  The Berkeley software License Agreement
        !             3: .\" specifies the terms and conditions for redistribution.
        !             4: .\"
        !             5: .\"    @(#)h.t 1.9 (Berkeley) 4/11/86
        !             6: .\"
        !             7: .nr i \w'\fBkern_resource.c\0'u/1n
        !             8: .de XP
        !             9: .IP \\fB\\$1\\fP \\ni
        !            10: ..
        !            11: .NH
        !            12: Header files
        !            13: .PP
        !            14: This section details changes in the header files in \fB/sys/h\fP.
        !            15: .XP acct.h
        !            16: Process accounting is now done in units of 1/\fBAHZ\fP (64) seconds
        !            17: rather than seconds.
        !            18: .XP buf.h
        !            19: The size of the buffer hash table has been increased substantially.
        !            20: .XP cmap.h
        !            21: The core map has had a number of fields enlarged to support larger
        !            22: memories and filesystems.
        !            23: The limits imposed by this structure are now commented.
        !            24: The current limits are 64 Mb of physical memory, 255 filesystems,
        !            25: 1 Gb process segments, 8 Gb per filesystem,
        !            26: and 65535 processes and text entries.
        !            27: The machine-language support now derives its definitions of these limits
        !            28: and the cmap structure from this file.
        !            29: .XP dmap.h
        !            30: The swap map per process segment was enlarged to allow images up to 64Mb.
        !            31: .XP domain.h
        !            32: New entry points to each domain have been added,
        !            33: for initialization, externalization of access rights,
        !            34: and disposal of access rights.
        !            35: .XP errno.h
        !            36: A definition of EDEADLK was added for System V compatibility.
        !            37: .XP fs.h
        !            38: One spare field in the superblock was allocated to store an option
        !            39: for the fragment allocation policy.
        !            40: .XP inode.h
        !            41: New fields were added to the in-core inode to hold a cache key
        !            42: and a pointer to any text image mapping the file.
        !            43: A new macro, ITIMES, is provided for updating the timestamps in an inode
        !            44: without writing the inode back to the disk.
        !            45: The inode is marked as modified with the IMOD flag.
        !            46: A flag has been added to allow serialization of directory renames.
        !            47: .XP ioctl.h
        !            48: New \fIioctl\fP operations have been added to get and set a terminal or window's
        !            49: size.
        !            50: The size is stored in a \fIwinsize\fP structure defined here.
        !            51: Other new \fIioctl\fPs have been defined to pass a small set of special
        !            52: commands from pseudo-terminals to their controllers.
        !            53: A new terminal option, LPASS8, allows a full 8-bit data path on input.
        !            54: The two tablet line disciplines have been merged.
        !            55: A new line discipline is provided for use with IP over serial data lines.
        !            56: .XP mbuf.h
        !            57: The handling of mbuf page clusters has been broken
        !            58: into macros separate from those that handle mbufs.
        !            59: MCLALLOC(\fIm\fP, \fIi\fP) is used to allocate \fIi\fP mbuf clusters
        !            60: (where \fIi\fP is currently restricted to 1)
        !            61: and MCLFREE(\fIm\fP) frees them.
        !            62: MCLGET(\fIm\fP) adds a page cluster to the already-allocated mbuf \fIm\fP,
        !            63: setting the mbuf length to CLBYTES if successful.
        !            64: The new macro M_HASCL(\fIm\fP)
        !            65: returns true if the mbuf \fIm\fP has an associated cluster,
        !            66: and MTOCL(\fIm\fP) returns a pointer to such a cluster.
        !            67: .XP mtio.h
        !            68: Definitions have been added for the TMSCP tape controllers
        !            69: and to enable or disable the use of an on-board tape buffer.
        !            70: .XP namei.h
        !            71: This header file was renamed, completed and put into use.
        !            72: .XP param.h
        !            73: Several limits have been increased.  Old values are listed in parentheses
        !            74: after each item.  The new limits are: 255 mounted filesystems (15),
        !            75: 40 processes per user (25), 64 open files (20), 20480 characters per argument
        !            76: list (10240), and 16 groups per user (8).
        !            77: The maximum length of a host name supported by the kernel is defined
        !            78: here as MAXHOSTNAMELEN.
        !            79: The default creation mask is now set to 022 by the kernel; previously
        !            80: that value was set by login, with the effect that remote shell processes
        !            81: used a different default.
        !            82: Clist blocks were doubled in size to 64 bytes.
        !            83: .XP proc.h
        !            84: Pointers were added to the \fIproc\fP structure
        !            85: to allow process entries to be linked
        !            86: onto lists of active, zombie or free processes.
        !            87: .XP protosw.h
        !            88: The address family field in the \fIprotosw\fP structure
        !            89: was replaced with a pointer to the \fIdomain\fP structure for the address
        !            90: family.
        !            91: Definitions were added for the arguments to the protocol \fIctloutput\fP 
        !            92: routines.
        !            93: .XP signal.h
        !            94: New signals have been defined for window size changes (SIGWINCH)
        !            95: and for user-defined functions (SIGUSR1 and SIGUSR2).
        !            96: The \fIsv_onstack\fP field in the \fIsigvec\fP structure has been redefined
        !            97: as a flags field, with flags defined for use of the signal stack
        !            98: and for signals to interrupt pending systems calls rather than restarting them.
        !            99: The \fIsigcontext\fP structure now includes the frame and argument pointers
        !           100: for the VAX so that the complete return sequence can be done by the kernel.
        !           101: A new macro, \fIsigmask\fP, is provided to simplify the use of \fIsigsetmask,
        !           102: sigblock\fP, and \fIsigpause\fP.
        !           103: .XP socket.h
        !           104: Definitions were added for new options set with \fIsetsockopt\fP.
        !           105: SO_BROADCAST requests permission to send to the broadcast address,
        !           106: formerly a privileged operation, while
        !           107: SO_SNDBUF and SO_RCVBUF may be used to examine or change the amount
        !           108: of buffer space allocated for a socket.
        !           109: Two new options are used only with \fIgetsockopt\fP:
        !           110: SO_ERROR obtains any current error status and clears it,
        !           111: and SO_TYPE returns the type of the socket.
        !           112: A new structure was added for use with SO_LINGER.
        !           113: Several new address families were defined.
        !           114: .XP socketvar.h
        !           115: The character and mbuf counts and limits in the \fIsockbuf\fP structure
        !           116: were changed from \fIshort\fP to \fIu_short\fP.
        !           117: SB_MAX defines the limit to the amount that can be placed in a \fIsockbuf\fP.
        !           118: The \fIsosendallatonce\fP macro was corrected; it previously
        !           119: returned true for sockets using non-blocking I/O.
        !           120: \fISoreadable\fP and \fIsowriteable\fP now return true if there
        !           121: is error status to report.
        !           122: .XP syslog.h
        !           123: The system logging facility has been extended to allow kernel use,
        !           124: and the header file has thus been moved from \fB/usr/include\fP.
        !           125: .XP tablet.h
        !           126: A new file that contains the definitions for use
        !           127: of the tablet line discipline.
        !           128: .XP text.h
        !           129: Linkage fields have been added to the text structure for use in
        !           130: constructing a text table free list.
        !           131: The structure used in recording text table usage statistics is defined here.
        !           132: .XP time.h
        !           133: The \fItime.h\fP header file has been split.  Those definitions relating to
        !           134: the \fIgettimeofday\fP system call remain
        !           135: in this file, included as <\fIsys/time.h\fP>.
        !           136: The original <\fItime.h\fP> file has returned and contains the definitions
        !           137: for the C library time routines.
        !           138: .XP tty.h
        !           139: The per-terminal data structure now contains the terminal size
        !           140: so that it can be changed dynamically.
        !           141: Files that include <\fIsys/tty.h\fP> now require <\fIsys/ioctl.h\fP> as well
        !           142: for the \fIwinsize\fP structure definition.
        !           143: .XP types.h
        !           144: The new typedefs for user and group ID's are located here.
        !           145: For compatibility and sensibility, the \fIsize_t\fP,
        !           146: \fItime_t\fP and \fIoff_t\fP types
        !           147: have all been changed from \fIint\fP to \fIlong\fP.
        !           148: New definitions have been added for integer masks and bit operators
        !           149: for use with the \fIselect\fP system call.
        !           150: .XP uio.h
        !           151: The offset field in the \fIuio\fP structure was changed from \fIint\fP
        !           152: to \fIoff_t\fP.
        !           153: Manifest constants for the \fIuio\fP segment values are now provided.
        !           154: .XP un.h
        !           155: The path in the Unix-domain version of a \fIsockaddr\fP was reduced
        !           156: so that use of the entire pathname array would still allow space for
        !           157: a null after the structure when stored in an mbuf.
        !           158: .XP unpcb.h
        !           159: A Unix-domain socket's own address is now stored in the protocol
        !           160: control block rather than that of the socket to which it is connected.
        !           161: Fields have been added for flow control on stream connections.
        !           162: If a \fIstat\fP has caused the assignment of a dummy inode number to the socket,
        !           163: that number is stored here.
        !           164: .XP user.h
        !           165: The user ID's, group ID's and groups array are declared using the new types
        !           166: for these ID's.
        !           167: A new field was added to handle the new signal flag
        !           168: avoiding system call restarts.
        !           169: The index of the last used file descriptor for the process is maintained
        !           170: in \fIu.u_lastfile\fP.
        !           171: The global fields \fIu_base, u_count,\fP and \fIu_offset\fP
        !           172: have been eliminated,
        !           173: with the new \fInameidata\fP structure replacing their remaining function.
        !           174: The \fIa.out\fP header is no longer kept in the user structure.
        !           175: .XP vmmac.h
        !           176: Several macros have been rewritten to improve the code generated by
        !           177: the compiler.
        !           178: New macros were added to lock and unlock \fIcmap\fP entries, substituting
        !           179: for \fImlock\fP and \fImunlock\fP.
        !           180: .XP vmmeter.h
        !           181: All counters are now uniformly declared as \fIlong\fP.
        !           182: Software interrupts are now counted.

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