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top: preserve current screen when receiving a SIGWINCH

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Prior to this commit, top has always taken the easiest
(safest?) approach when dealing with those troublesome
SIGWINCH interrupts. Whenever the user was on a screen
other than the main display, any signal received would
force an immediate exit, returning to the main screen.

With these changes, top will retain the user's current
position regardless of what screen he/she was viewing.

In support the following additional changes were made:
* the initial help screen requires an explicit end key
` not 'any other key' formerly used to request an exit
* the colors mapping screen instructions were improved
* ^Z response was made immediate, eliminating the flag
* the sigaction's SA_RESTART flag had to be eliminated
* sigprocmask logic was normailize to the bare minimum
* the POSIX.1-2004 async-signal safe functions used in
` the signal handlers were acknowledged and documented

(everything is perfectly justified plus right margins)
(are completely filled, but of course it must be luck)

Reference(s):
http://www.freelists.org/post/procps/unwanted-topinspect-window-enclosure-with-the-terminal-size-change

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner
2013-01-16 00:00:00 -06:00
committed by Craig Small
parent 5856919e83
commit ba9092ad83
4 changed files with 161 additions and 126 deletions
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25
top/top_nls.h
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@@ -69,19 +69,18 @@ enum norm_nls {
COLORS_nomap_txt, DELAY_badarg_txt, DELAY_change_fmt, DELAY_secure_txt,
DISABLED_cmd_txt, DISABLED_win_fmt, EXIT_signals_fmt, FAIL_alloc_c_txt,
FAIL_alloc_r_txt, FAIL_openlib_fmt, FAIL_rc_open_fmt, FAIL_re_nice_fmt,
FAIL_sigmask_fmt, FAIL_signals_fmt, FAIL_sigstop_fmt, FAIL_statget_txt,
FAIL_statopn_fmt, FAIL_tty_get_txt, FAIL_tty_mod_fmt, FAIL_tty_raw_fmt,
FAIL_widecpu_txt, FAIL_widepid_txt, FIND_no_find_fmt, FIND_no_next_txt,
FOREST_modes_fmt, FOREST_views_txt, GET_find_str_txt, GET_max_task_fmt,
GET_nice_num_fmt, GET_pid2kill_fmt, GET_pid2nice_fmt, GET_sigs_num_fmt,
GET_user_ids_txt, HELP_cmdline_fmt, HILIGHT_cant_txt, IRIX_curmode_fmt,
LIMIT_exceed_fmt, MISSING_args_fmt, NAME_windows_fmt, NOT_onsecure_txt,
NOT_smp_cpus_txt, OFF_one_word_txt, ON_word_only_txt, RC_bad_entry_fmt,
RC_bad_files_fmt, SCROLL_coord_fmt, SELECT_clash_txt, THREADS_show_fmt,
TIME_accumed_fmt, UNKNOWN_cmds_txt, UNKNOWN_opts_fmt, USAGE_abbrev_txt,
WORD_allcpus_txt, WORD_another_txt, WORD_eachcpu_fmt, WORD_process_txt,
WORD_threads_txt, WRITE_rcfile_fmt, WRONG_switch_fmt, XTRA_fixwide_fmt,
XTRA_sortopt_fmt, XTRA_warncfg_txt,
FAIL_signals_fmt, FAIL_statget_txt, FAIL_statopn_fmt, FAIL_tty_get_txt,
FAIL_tty_set_fmt, FAIL_widecpu_txt, FAIL_widepid_txt, FIND_no_find_fmt,
FIND_no_next_txt, FOREST_modes_fmt, FOREST_views_txt, GET_find_str_txt,
GET_max_task_fmt, GET_nice_num_fmt, GET_pid2kill_fmt, GET_pid2nice_fmt,
GET_sigs_num_fmt, GET_user_ids_txt, HELP_cmdline_fmt, HILIGHT_cant_txt,
IRIX_curmode_fmt, LIMIT_exceed_fmt, MISSING_args_fmt, NAME_windows_fmt,
NOT_onsecure_txt, NOT_smp_cpus_txt, OFF_one_word_txt, ON_word_only_txt,
RC_bad_entry_fmt, RC_bad_files_fmt, SCROLL_coord_fmt, SELECT_clash_txt,
THREADS_show_fmt, TIME_accumed_fmt, UNKNOWN_cmds_txt, UNKNOWN_opts_fmt,
USAGE_abbrev_txt, WORD_allcpus_txt, WORD_another_txt, WORD_eachcpu_fmt,
WORD_process_txt, WORD_threads_txt, WRITE_rcfile_fmt, WRONG_switch_fmt,
XTRA_fixwide_fmt, XTRA_sortopt_fmt, XTRA_warncfg_txt,
#ifndef INSP_OFFDEMO
YINSP_demo01_txt, YINSP_demo02_txt, YINSP_demo03_txt, YINSP_deqfmt_txt,
YINSP_deqtyp_txt, YINSP_dstory_txt,