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0bd5cb03 - libtextstyle: Implement reliable tty control.

libtextstyle: Implement reliable tty control. * gnulib-local/lib/term-ostream.oo.c (DEBUG_SIGNALS): New macro. Include <stdio.h>, <sys/stat.h>. (NOFLSH): Define fallback value. Include sig-handler.h, same-inode.h. (ASYNC_SAFE): New macro. (color_bgr): Mark as ASYNC_SAFE. (nonintr_tcgetattr, nonintr_tcsetattr): New functions. (log_message, sprintf_integer, simple_errno_string, simple_signal_string, log_signal_handler_called): New functions. (struct term_ostream): Add fields restore_colors, restore_weight, restore_posture, restore_underline, tty_control, same_as_stderr. (BLOCK_SIGNALS_DURING_NON_DEFAULT_STYLE_OUTPUT): New macro. (term_fd): New variable. (pgrp_status_t): New type. (pgrp_status): New variable. (update_pgrp_status): New function. (out_stream): New variable. (restore_colors, restore_weight, restore_posture, restore_underline): Remove variables. (out_color_change, out_bgcolor_change, out_weight_change, out_posture_change, out_underline_change): New functions, extracted from out_attr_change. (out_attr_change): Call these functions. (restore): Use out_stream. (tcsetattr_failed): New function. (orig_lflag_set, orig_lflag): New variables. (clobber_local_mode, restore_local_mode): New functions. (job_control_signals): Renamed from stopping_signals. Add SIGCONT. (num_job_control_signals): Renamed from num_stopping_signals. (relevant_signal_set): Replaces stopping_signal_set. (relevant_signal_set_initialized): New variable. (init_relevant_signal_set): Replaces init_stopping_signal_set. (block_relevant_signals): Replaces block_stopping_signals. (unblock_relevant_signals): Replaces unblock_stopping_signals. (is_ignored): New function. (show_signal_marker): New function. (fatal_or_stopping_signal_handler, fatal_signal_handler, stopping_signal_handler, continuing_signal_handler, ensure_continuing_signal_handler, ensure_other_signal_handlers): New functions. (activate_non_default_attr, deactivate_non_default_attr): Rewritten. (term_ostream::free): Unset term_fd and call update_pgrp_status. (term_ostream_create): Initialize the fields restore_colors, restore_weight, restore_posture, restore_underline, tty_control, same_as_stderr. Call init_relevant_signal_set. Set term_fd and call ensure_continuing_signal_handler and update_pgrp_status. * gnulib-local/m4/term-ostream.m4 (gl_TERM_OSTREAM): Check for tcgetattr. * gnulib-local/modules/term-ostream (Depends-on): Add sigaction, same-inode. * libtextstyle/NEWS: Mention the change.