changelog.0

实战Linux编程的原代码,希望对学驱动的人能有所帮助

	getugroups an array of gid_t instead of int.

	* system.h: New file.
	* Most programs: include it.

Fri Jul 19 12:04:58 1991  David J. MacKenzie  (djm at apple-gunkies)

	* env.c [!STDC_HEADERS]: Declare errno.
	* printf.c, pathchk.c: Don't include errno.h; not needed.

	* version.c: New file.
	* All C programs: Link with it, to get version number in the
	binary where at least `strings -' and grep can find it.

	* pathchk.c (strip_trailing_slashes): Function removed; use
	version in lib.

Mon Jul 15 11:34:22 1991  David J. MacKenzie  (djm at wookumz.gnu.ai.mit.edu)

	* Version 1.0.

	* pathchk.c: Always check whether _POSIX_PATH_MAX and
	_POSIX_NAME_MAX need to be defined.
	[POSIX]: If no PATH_MAX or NAME_MAX and pathconf for the path
	returns -1 (some systems do this if the path does not exist),
	use pathconf for "/".

Sun Jul 14 21:17:22 1991  David J. MacKenzie  (djm at geech.gnu.ai.mit.edu)

	* date.c (date_seconds): Function removed, replaced with
	posixtm.y in lib.
	(set_date): Change caller.
	* configure: Check for bison.

	* stty.c [!C_LINE_MISSING]: Add support for setting and
	printing the line discipline.
	* configure: Check for C_LINE_MISSING.

	* configure: Check for Minix.

Sat Jul 13 01:33:59 1991  David J. MacKenzie  (djm at geech.gnu.ai.mit.edu)

	* Add `man' directory and manual pages.
	* configure: Set INSTALLDATA and MAN.

	* id.c: Add #ifdefs for POSIX ways of getting max groups list size.
	(print_group_list, print_full_info): Allocate list of groups
	with malloc since its size might not be constant.

	* nice.c (main): Don't adjust priority if printing it.
	Default adjustment of 10, not 0.

	* printf.c: Add \c escape and %b conversion.
	Implement '*' for field width and precision.
	Make all errors fatal.
	(print_esc_string, print_esc): New functions.

	* configure, date.c: Change SYS_TIME_H to TM_IN_SYS_TIME.
	* configure: Always check where to find struct tm.

	* yes.c: Rewrite to accept multiple arguments.

	* Add groups.sh.

Fri Jul 12 10:57:00 1991  David J. MacKenzie  (djm at wookumz.gnu.ai.mit.edu)

	* dirname.c: Move code from dirname function into main,
	simplifying things quite a bit.  From Jim Meyering.
	* Omit strdup from lib; no longer used.
	* configure: Don't check for strdup.

	* printenv.c (main): If args given, print the values in the order
	given on the command line rather than the order given in the
	environment.

	* tee.c, tty.c (struct longopts): Revise to make short-option
	equivalents clear.

Thu Jul 11 12:46:11 1991  David J. MacKenzie  (djm at geech.gnu.ai.mit.edu)

	* nice.c: Add long options.

	* Add date command and libraries it needs.
	* configure: Updated.

	* env.c: Add long options.  Use GNU putenv instead of custom
	setenv function.

	* id.c: Add long options.

	* pathchk.c [POSIX]: Use pathconf if necessary to get NAME_MAX
	and PATH_MAX.

	* nice.c: Use exit status required for nohup by POSIX.2
	(nohup execs nice).

	* sleep.c: Don't bother with hex and octal.

	* env.c: Fix exit status for POSIX.2 draft 11.1.

	* Many files: Remove private copies of xmalloc, error, xstrdup,
	etc. to use shared versions.
	Fix #includes for USG, STDC_HEADERS, POSIX.

Mon Jul  8 18:56:24 1991  David J. MacKenzie  (djm at churchy.gnu.ai.mit.edu)

	* date.c (main): For -u, set TZ to "" instead of "GMT0",
	unless on HP-UX or Ultrix.

	* Rename some feature-test macros.
	* stime.c: Created from code in date.c.
	* date.c (compute_tm_zone): New function.
	(date_seconds, show_date): Use it.
	(xmalloc, xrealloc): Functions removed; use xmalloc.c instead.

Tue Jul  2 02:28:11 1991  David J. MacKenzie  (djm at geech.gnu.ai.mit.edu)

	* tee.c (tee): Report errors in closing files.

Mon Mar 18 10:13:59 1991  Jeffrey A. Law  (law at geech.ai.mit.edu)

	* date.c (date_seconds, show_date): #if COMPUTE_TMZONE then
	compute the proper value to place in tm->tm_zone from
	information returned by localtime and gettimeofday.

Fri Apr 26 11:38:09 1991  David J. MacKenzie  (djm at mole.gnu.ai.mit.edu)

	* stty.c: Define default values for control chars if necessary.
	Complain about invalid options if no other options follow.
	Use POSIX functions instead of ioctl, for manipulating termios.

	* expr.c (main): Exit status was backwards.

Thu Dec 20 00:36:01 1990  David J. MacKenzie  (djm at apple-gunkies)

	* id.c: Reorganization and many changes to fix bugs and POSIX
	compliance problems.

Mon Dec 10 03:09:13 1990  David J. MacKenzie  (djm at apple-gunkies)

	* stty.c: Don't declare printf and some other functions that
	might have variable numbers of args in system header file decls.

Tue Nov 14 23:37:22 1990  Roland McGrath  (roland at geech.ai.mit.edu)

	* id.c (print_groups): Put spaces after commas.
	(print_group): New fn, to print a group id.  Uses numeric fmt
	unless -n, in which case it uses group names.
	(print_groups): Call it.  Find the rgid and egid, and print them as
	well as the supplementary groups.  Make sure we print each group only
	once.

Sun Sep 16 01:49:14 1990  David J. MacKenzie  (djm at apple-gunkies)

	* id.c (main): Add -G option for POSIX.2 draft 10.
	Allow a username to be given.
	(print_groups): New function from code in main.
	(getugroups): New function.

Sun Aug 12 00:32:01 1990  David J. MacKenzie  (djm at albert.ai.mit.edu)

	* env.c (main): Instead of setting _POSIX_OPTION_ORDER,
	tell getopt to not permute, with `+'.

Sat Aug 11 01:32:53 1990  David J. MacKenzie  (djm at albert.ai.mit.edu)

	* expr.c: Use regex.c library instead of private regex routines.

	* nice.c (main): Add -n option for POSIX.2a.
	(usage): New function.

Fri Aug 10 23:58:11 1990  David J. MacKenzie  (djm at albert.ai.mit.edu)

	* who.c: Add -m, -i, -w options for POSIX.2a.

Tue Aug  7 00:01:02 1990  David J. MacKenzie  (djm at apple-gunkies)

	* expr.c: Use exit directly instead of longjmp on error.
	Use argv[0] instead of hardcoded "expr" in messages.
	Make some functions void.

Sat Aug  4 21:19:25 1990  David J. MacKenzie  (djm at pogo.ai.mit.edu)

	* env.c: Change exit statuses for POSIX draft 10.

Wed Jul  4 04:32:51 1990  David J. MacKenzie  (djm at apple-gunkies)

	* tee.c: Use error instead of perror_with_name and
	out_of_memory.

Wed Jun 20 02:39:49 1990  David J. MacKenzie  (djm at albert.ai.mit.edu)

	* date.c: Change -DSETTOD to -DSTIME_MISSING, -DSIZE_T to
	-DSIZE_T_IN_TYPES, and -DSTDC_HDRS to -DSTDC_HEADERS.
	Declare some more functions.  Replace fatal, memory_out, and
	nonfatal_perror with error.

Mon Jun 18 00:16:52 1990  David J. MacKenzie  (djm at apple-gunkies)

	* stty.c: Add some Unix compatibility modes.

Sat Jun 16 21:05:59 1990  David J. MacKenzie  (djm at apple-gunkies)

	* stty.c (display_changed, display_all): Print values of min
	and time.

Thu Jun 14 17:49:31 1990  David J. MacKenzie  (djm at apple-gunkies)

	* stty.c: Implement tab, backspace, etc. delay args.

Thu May 31 12:25:40 1990  David J. MacKenzie  (djm at albert.ai.mit.edu)

	* nohup.sh: Don't ignore SIGTERM.
	If ./nohup.out is unwritable, try $HOME/nohup.out.

Thu May  3 22:33:32 1990  David J. MacKenzie  (djm at albert.ai.mit.edu)

	* who.c: Use error instead of fatal and fatal_perror.
	(print_headings): Print headings in all caps, like SYSV does.
	(list_entries): New function for -q to make it like SYSV -q.
	(valid_entries): Function removed.

Mon Apr  2 01:27:23 1990  David J. MacKenzie  (djm at albert.ai.mit.edu)

	* id.c (main): Don't strip off leading path from program name.
	Revise a couple of error messages.

	* whoami.c (main): Use geteuid, not getuid, for Unix compatibility.

Tue Mar 20 14:28:25 1990  David J. MacKenzie  (djm at pogo.ai.mit.edu)

	* tee.c (main): Pass list of files and its size as args to tee
	rather than as global vars.  Exit with return value of tee
	instead of always 0.
	(tee): Use unbuffered I/O instead of stdio, for POSIX.
	Return an error status.
	(xwrite): New function.

Tue Mar 13 00:38:13 1990  David J. MacKenzie  (djm at albert.ai.mit.edu)

	* who.c (who_am_i): Print heading before checking to see
	whether there is an entry for the tty on stdin, for
	consistency with the who function.
	(main): Use argv[optind], not argv[1], as alternate file.

Fri Mar  9 15:49:04 1990  David J. MacKenzie  (djm at albert.ai.mit.edu)

	* who.c: Rename UTMP to UTMP_FILE for compatibility with SysV
	utmp.h.  Include some additional header files.
	(main): Recognize some options from SysVr3 who. Call usage.
	Set new global var `program_name' from argv[0].
	(usage): New function.
	(who): If -q given, only print count of users logged on.
	(print_entry): New function to format an entry on the output;
	make format more like that of the Unix who programs.
	(print_heading): New function to print a line describing each
	output field.
	(who, who_am_i): Call print_entry and print_heading.
	(valid_entries): New function to return count of nonempty
	entries in utmp.
	(search_entries): Compare with utmp tty field instead of
	username field.  Don't assume null termination in utmp field.
	(who_am_i): Print the entry for the tty on stdin rather than
	the first entry found for the uid.  If hostname is not
	available, use a null one instead of "<unknown>".
	Don't hardcode max hostname length.
	(idle_string): New function to format idle time field.
	(fatal, fatal_perror): Use program_name instead of hardcoded "who"
	in error messages.

Tue Mar  6 00:59:03 1990  David J. MacKenzie  (djm at albert.ai.mit.edu)

	* printenv.c (main): Allow multiple variables to be specified.
	(barf): Function removed.

Sat Jan 20 18:41:48 1990  Jim Kingdon  (kingdon at geech)

	* expr.c (nextarg): Do not pass *args to strcmp if NULL.

Mon Dec 18 09:57:20 1989  David J. MacKenzie  (djm at hobbes.ai.mit.edu)

	* printenv.c (main): Simplify error messages.

Sat Dec 16 15:15:50 1989  David J. MacKenzie  (djm at hobbes.ai.mit.edu)

	* expr.c: Indent to regularize spacing.
	(cmpv, arithf): Change '#define foo (args)' to '#define foo(args)'
	so they compile.
	(docolon): Remove unused vars.
	(multiply): Rename from times to avoid libc conflict.
	(error): Include program name in message.
	(xmalloc): Rename from Malloc.
	(re_compiled): Rename from re_comp to avoid libc conflict.

	* basename.c: Fix some weird indentation.
	(main): Print a clearer usage message.
	Use a simpler method for removing suffix, if given.
	(fatal): Function no longer used; removed.

	* sleep.c: (main): Rename `time' to `seconds'.  Print usage
	message if given no args.
	Exit with status 0 instead of falling off end.
	(error): Print to stderr, not stdout.

	* tee.c: (main): Use getopt_long instead of custom parser,
	and adjust usage message.
	Use list of filenames in argv rather than making a copy.
	(tee): New function created from the second half of main.
	Fix bug where it tried to fclose a loop index instead of a stream.
	(xmalloc): Ok to return 0 if 0 bytes requested.
	(xrealloc): Unused function removed.

	* whoami.c: Canonicalize usage message and fix error message.

	* who.c: Declare some functions.
	(fatal_perror): New function for printing errors after system
	calls.
	Global: Use it when appropriate.
	(xmalloc): Return char *, not int.
	(read_utmp): Ok if utmp file is empty.
	Include filename in error messages.
	(scan_entries): Adjust columns to line up better, particularly
	when there are users with 8 character long usernames logged in.

Sat Oct 28 13:20:43 1989  David J. MacKenzie  (djm at spiff)

	* uname.c: Added long options.
	global: changed the word `part' to the word `element'
	(more precise).
	(program_name, long_options): New variables.
	(main): Support long options.
	(usage): Add long options summary to message.

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