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<H1 class="no-header">curs_initscr 3x</H1>
<PRE>
-<STRONG><A HREF="curs_initscr.3x.html">curs_initscr(3x)</A></STRONG> <STRONG><A HREF="curs_initscr.3x.html">curs_initscr(3x)</A></STRONG>
+<STRONG><A HREF="curs_initscr.3x.html">curs_initscr(3x)</A></STRONG>
<STRONG><A HREF="curs_initscr.3x.html">curs_initscr(3x)</A></STRONG>
</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
- <STRONG>initscr</STRONG>, <STRONG>newterm</STRONG>, <STRONG>endwin</STRONG>, <STRONG>isendwin</STRONG>, <STRONG>set_term</STRONG>, <STRONG>delscreen</STRONG> -
- <STRONG>curses</STRONG> screen initialization and manipulation routines
+ <STRONG>initscr</STRONG>, <STRONG>newterm</STRONG>, <STRONG>endwin</STRONG>, <STRONG>isendwin</STRONG>, <STRONG>set_term</STRONG>, <STRONG>delscreen</STRONG> - <STRONG>curses</STRONG> screen
+ initialization and manipulation routines
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
</PRE><H3><a name="h3-initscr">initscr</a></H3><PRE>
- <STRONG>initscr</STRONG> is normally the first <STRONG>curses</STRONG> routine to call when
- initializing a program. A few special routines sometimes
- need to be called before it; these are <STRONG>slk_init</STRONG>, <STRONG>filter</STRONG>,
- <STRONG>ripoffline</STRONG>, <STRONG>use_env</STRONG>. For multiple-terminal applications,
- <STRONG>newterm</STRONG> may be called before <STRONG>initscr</STRONG>.
+ <STRONG>initscr</STRONG> is normally the first <STRONG>curses</STRONG> routine to call when initializing
+ a program. A few special routines sometimes need to be called before
+ it; these are <STRONG><A HREF="curs_slk.3x.html">slk_init(3x)</A></STRONG>, <STRONG>filter</STRONG>, <STRONG>ripoffline</STRONG>, <STRONG>use_env</STRONG>. For multiple-
+ terminal applications, <STRONG>newterm</STRONG> may be called before <STRONG>initscr</STRONG>.
- The initscr code determines the terminal type and initial-
- izes all <STRONG>curses</STRONG> data structures. <STRONG>initscr</STRONG> also causes the
- first call to <STRONG>refresh</STRONG> to clear the screen. If errors oc-
- cur, <STRONG>initscr</STRONG> writes an appropriate error message to stan-
- dard error and exits; otherwise, a pointer is returned to
- <STRONG>stdscr</STRONG>.
+ The initscr code determines the terminal type and initializes all <STRONG>curs-</STRONG>
+ <STRONG>es</STRONG> data structures. <STRONG>initscr</STRONG> also causes the first call to <STRONG><A HREF="curscurs_refresh.3x.html">refresh(3x)</A></STRONG>
+ to clear the screen. If errors occur, <STRONG>initscr</STRONG> writes an appropriate
+ error message to standard error and exits; otherwise, a pointer is re-
+ turned to <STRONG>stdscr</STRONG>.
</PRE><H3><a name="h3-newterm">newterm</a></H3><PRE>
- A program that outputs to more than one terminal should
- use the <STRONG>newterm</STRONG> routine for each terminal instead of
- <STRONG>initscr</STRONG>. A program that needs to inspect capabilities, so
- it can continue to run in a line-oriented mode if the ter-
- minal cannot support a screen-oriented program, would also
- use <STRONG>newterm</STRONG>. The routine <STRONG>newterm</STRONG> should be called once
- for each terminal. It returns a variable of type <STRONG>SCREEN</STRONG> <STRONG>*</STRONG>
- which should be saved as a reference to that terminal.
- <STRONG>newterm</STRONG>'s arguments are
+ A program that outputs to more than one terminal should use the <STRONG>newterm</STRONG>
+ routine for each terminal instead of <STRONG>initscr</STRONG>. A program that needs to
+ inspect capabilities, so it can continue to run in a line-oriented mode
+ if the terminal cannot support a screen-oriented program, would also
+ use <STRONG>newterm</STRONG>. The routine <STRONG>newterm</STRONG> should be called once for each termi-
+ nal. It returns a variable of type <STRONG>SCREEN</STRONG> <STRONG>*</STRONG> which should be saved as a
+ reference to that terminal. <STRONG>newterm</STRONG>'s arguments are
<STRONG>o</STRONG> the <EM>type</EM> of the terminal to be used in place of <STRONG>$TERM</STRONG>,
</PRE><H3><a name="h3-endwin">endwin</a></H3><PRE>
- The program must also call <STRONG>endwin</STRONG> for each terminal being
- used before exiting from <STRONG>curses</STRONG>. If <STRONG>newterm</STRONG> is called
- more than once for the same terminal, the first terminal
- referred to must be the last one for which <STRONG>endwin</STRONG> is
- called.
+ The program must also call <STRONG>endwin</STRONG> for each terminal being used before
+ exiting from <STRONG>curses</STRONG>. If <STRONG>newterm</STRONG> is called more than once for the same
+ terminal, the first terminal referred to must be the last one for which
+ <STRONG>endwin</STRONG> is called.
- A program should always call <STRONG>endwin</STRONG> before exiting or es-
- caping from <STRONG>curses</STRONG> mode temporarily. This routine
+ A program should always call <STRONG>endwin</STRONG> before exiting or escaping from
+ <STRONG>curses</STRONG> mode temporarily. This routine
- <STRONG>o</STRONG> restores tty modes,
+ <STRONG>o</STRONG> resets colors to correspond with the default color pair 0,
- <STRONG>o</STRONG> moves the cursor to the lower left-hand corner of the
- screen and
+ <STRONG>o</STRONG> moves the cursor to the lower left-hand corner of the screen,
- <STRONG>o</STRONG> resets the terminal into the proper non-visual mode.
+ <STRONG>o</STRONG> clears the remainder of the line so that it uses the default col-
+ ors,
- Calling <STRONG>refresh</STRONG> or <STRONG>doupdate</STRONG> after a temporary escape caus-
- es the program to resume visual mode.
+ <STRONG>o</STRONG> sets the cursor to normal visibility (see <STRONG><A HREF="curs_kernel.3x.html">curs_set(3x)</A></STRONG>),
+
+ <STRONG>o</STRONG> stops cursor-addressing mode using the <EM>exit</EM><STRONG>_</STRONG><EM>ca</EM><STRONG>_</STRONG><EM>mode</EM> terminal capa-
+ bility,
+
+ <STRONG>o</STRONG> restores tty modes (see <STRONG><A HREF="curs_kernel.3x.html">reset_shell_mode(3x)</A></STRONG>).
+
+ Calling <STRONG><A HREF="curs_refresh.3x.html">refresh(3x)</A></STRONG> or <STRONG><A HREF="curs_refresh.3x.html">doupdate(3x)</A></STRONG> after a temporary escape causes the
+ program to resume visual mode.
</PRE><H3><a name="h3-isendwin">isendwin</a></H3><PRE>
- The <STRONG>isendwin</STRONG> routine returns <STRONG>TRUE</STRONG> if <STRONG>endwin</STRONG> has been
- called without any subsequent calls to <STRONG>wrefresh</STRONG>, and <STRONG>FALSE</STRONG>
- otherwise.
+ The <STRONG>isendwin</STRONG> routine returns <STRONG>TRUE</STRONG> if <STRONG>endwin</STRONG> has been called without any
+ subsequent calls to <STRONG>wrefresh</STRONG>, and <STRONG>FALSE</STRONG> otherwise.
</PRE><H3><a name="h3-set_term">set_term</a></H3><PRE>
- The <STRONG>set_term</STRONG> routine is used to switch between different
- terminals. The screen reference <STRONG>new</STRONG> becomes the new cur-
- rent terminal. The previous terminal is returned by the
- routine. This is the only routine which manipulates
- <STRONG>SCREEN</STRONG> pointers; all other routines affect only the cur-
- rent terminal.
+ The <STRONG>set_term</STRONG> routine is used to switch between different terminals.
+ The screen reference <STRONG>new</STRONG> becomes the new current terminal. The previ-
+ ous terminal is returned by the routine. This is the only routine
+ which manipulates <STRONG>SCREEN</STRONG> pointers; all other routines affect only the
+ current terminal.
</PRE><H3><a name="h3-delscreen">delscreen</a></H3><PRE>
- The <STRONG>delscreen</STRONG> routine frees storage associated with the
- <STRONG>SCREEN</STRONG> data structure. The <STRONG>endwin</STRONG> routine does not do
- this, so <STRONG>delscreen</STRONG> should be called after <STRONG>endwin</STRONG> if a par-
- ticular <STRONG>SCREEN</STRONG> is no longer needed.
+ The <STRONG>delscreen</STRONG> routine frees storage associated with the <STRONG>SCREEN</STRONG> data
+ structure. The <STRONG>endwin</STRONG> routine does not do this, so <STRONG>delscreen</STRONG> should be
+ called after <STRONG>endwin</STRONG> if a particular <STRONG>SCREEN</STRONG> is no longer needed.
</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
- <STRONG>endwin</STRONG> returns the integer <STRONG>ERR</STRONG> upon failure and <STRONG>OK</STRONG> upon
- successful completion.
+ <STRONG>endwin</STRONG> returns the integer <STRONG>ERR</STRONG> upon failure and <STRONG>OK</STRONG> upon successful com-
+ pletion.
Routines that return pointers always return <STRONG>NULL</STRONG> on error.
- X/Open defines no error conditions. In this implementa-
- tion
+ X/Open defines no error conditions. In this implementation
- <STRONG>o</STRONG> <STRONG>endwin</STRONG> returns an error if the terminal was not ini-
- tialized.
+ <STRONG>o</STRONG> <STRONG>endwin</STRONG> returns an error if the terminal was not initialized.
- <STRONG>o</STRONG> <STRONG>newterm</STRONG> returns an error if it cannot allocate the da-
- ta structures for the screen, or for the top-level
- windows within the screen, i.e., <STRONG>curscr</STRONG>, <STRONG>newscr</STRONG>, or
- <STRONG>stdscr</STRONG>.
+ <STRONG>o</STRONG> <STRONG>newterm</STRONG> returns an error if it cannot allocate the data structures
+ for the screen, or for the top-level windows within the screen,
+ i.e., <STRONG>curscr</STRONG>, <STRONG>newscr</STRONG>, or <STRONG>stdscr</STRONG>.
<STRONG>o</STRONG> <STRONG>set_term</STRONG> returns no error.
-</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
- Note that <STRONG>initscr</STRONG> and <STRONG>newterm</STRONG> may be macros.
-
-
</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
- These functions were described in the XSI Curses standard,
- Issue 4. As of 2015, the current document is X/Open Curs-
- es, Issue 7.
+ These functions were described in the XSI Curses standard, Issue 4. As
+ of 2015, the current document is X/Open Curses, Issue 7.
</PRE><H3><a name="h3-Differences">Differences</a></H3><PRE>
- X/Open specifies that portable applications must not call
- <STRONG>initscr</STRONG> more than once:
+ X/Open specifies that portable applications must not call <STRONG>initscr</STRONG> more
+ than once:
- <STRONG>o</STRONG> The portable way to use <STRONG>initscr</STRONG> is once only, using
- <STRONG>refresh</STRONG> (see <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>) to restore the screen
- after <STRONG>endwin</STRONG>.
+ <STRONG>o</STRONG> The portable way to use <STRONG>initscr</STRONG> is once only, using <STRONG>refresh</STRONG> (see
+ <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>) to restore the screen after <STRONG>endwin</STRONG>.
<STRONG>o</STRONG> This implementation allows using <STRONG>initscr</STRONG> after <STRONG>endwin</STRONG>.
- Old versions of curses, e.g., BSD 4.4, may have returned a
- null pointer from <STRONG>initscr</STRONG> when an error is detected,
- rather than exiting. It is safe but redundant to check
- the return value of <STRONG>initscr</STRONG> in XSI Curses.
+ Old versions of curses, e.g., BSD 4.4, may have returned a null pointer
+ from <STRONG>initscr</STRONG> when an error is detected, rather than exiting. It is
+ safe but redundant to check the return value of <STRONG>initscr</STRONG> in XSI Curses.
</PRE><H3><a name="h3-Unset-TERM-Variable">Unset TERM Variable</a></H3><PRE>
- If the TERM variable is missing or empty, <STRONG>initscr</STRONG> uses the
- value "unknown", which normally corresponds to a terminal
- entry with the <EM>generic</EM> (<EM>gn</EM>) capability. Generic entries
- are detected by <STRONG>setupterm</STRONG> (see <STRONG><A HREF="curs_terminfo.3x.html">curs_terminfo(3x)</A></STRONG>) and can-
- not be used for full-screen operation. Other implementa-
- tions may handle a missing/empty TERM variable different-
- ly.
+ If the TERM variable is missing or empty, <STRONG>initscr</STRONG> uses the value "un-
+ known", which normally corresponds to a terminal entry with the <EM>generic</EM>
+ (<EM>gn</EM>) capability. Generic entries are detected by <STRONG>setupterm</STRONG> (see
+ <STRONG><A HREF="curs_terminfo.3x.html">curs_terminfo(3x)</A></STRONG>) and cannot be used for full-screen operation. Other
+ implementations may handle a missing/empty TERM variable differently.
</PRE><H3><a name="h3-Signal-Handlers">Signal Handlers</a></H3><PRE>
Quoting from X/Open Curses, section 3.1.1:
- <EM>Curses</EM> <EM>implementations</EM> <EM>may</EM> <EM>provide</EM> <EM>for</EM> <EM>special</EM> <EM>han-</EM>
- <EM>dling</EM> <EM>of</EM> <EM>the</EM> <EM>SIGINT,</EM> <EM>SIGQUIT</EM> <EM>and</EM> <EM>SIGTSTP</EM> <EM>signals</EM> <EM>if</EM>
- <EM>their</EM> <EM>disposition</EM> <EM>is</EM> <EM>SIG</EM><STRONG>_</STRONG><EM>DFL</EM> <EM>at</EM> <EM>the</EM> <EM>time</EM> <STRONG>initscr()</STRONG> <EM>is</EM>
- <EM>called</EM> <STRONG>...</STRONG>
+ <EM>Curses</EM> <EM>implementations</EM> <EM>may</EM> <EM>provide</EM> <EM>for</EM> <EM>special</EM> <EM>handling</EM> <EM>of</EM> <EM>the</EM>
+ <STRONG>SIGINT</STRONG><EM>,</EM> <STRONG>SIGQUIT</STRONG> <EM>and</EM> <STRONG>SIGTSTP</STRONG> <EM>signals</EM> <EM>if</EM> <EM>their</EM> <EM>disposition</EM> <EM>is</EM>
+ <STRONG>SIG_DFL</STRONG> <EM>at</EM> <EM>the</EM> <EM>time</EM> <STRONG>initscr</STRONG> <EM>is</EM> <EM>called</EM> <STRONG>...</STRONG>
- <EM>Any</EM> <EM>special</EM> <EM>handling</EM> <EM>for</EM> <EM>these</EM> <EM>signals</EM> <EM>may</EM> <EM>remain</EM> <EM>in</EM>
- <EM>effect</EM> <EM>for</EM> <EM>the</EM> <EM>life</EM> <EM>of</EM> <EM>the</EM> <EM>process</EM> <EM>or</EM> <EM>until</EM> <EM>the</EM>
- <EM>process</EM> <EM>changes</EM> <EM>the</EM> <EM>disposition</EM> <EM>of</EM> <EM>the</EM> <EM>signal.</EM>
+ <EM>Any</EM> <EM>special</EM> <EM>handling</EM> <EM>for</EM> <EM>these</EM> <EM>signals</EM> <EM>may</EM> <EM>remain</EM> <EM>in</EM> <EM>effect</EM> <EM>for</EM>
+ <EM>the</EM> <EM>life</EM> <EM>of</EM> <EM>the</EM> <EM>process</EM> <EM>or</EM> <EM>until</EM> <EM>the</EM> <EM>process</EM> <EM>changes</EM> <EM>the</EM> <EM>disposi-</EM>
+ <EM>tion</EM> <EM>of</EM> <EM>the</EM> <EM>signal.</EM>
- <EM>None</EM> <EM>of</EM> <EM>the</EM> <EM>Curses</EM> <EM>functions</EM> <EM>are</EM> <EM>required</EM> <EM>to</EM> <EM>be</EM> <EM>safe</EM>
- <EM>with</EM> <EM>respect</EM> <EM>to</EM> <EM>signals</EM> ...
+ <EM>None</EM> <EM>of</EM> <EM>the</EM> <EM>Curses</EM> <EM>functions</EM> <EM>are</EM> <EM>required</EM> <EM>to</EM> <EM>be</EM> <EM>safe</EM> <EM>with</EM> <EM>respect</EM>
+ <EM>to</EM> <EM>signals</EM> ...
- This implementation establishes signal handlers during
- initialization, e.g., <STRONG>initscr</STRONG> or <STRONG>newterm</STRONG>. Applications
- which must handle these signals should set up the corre-
- sponding handlers <EM>after</EM> initializing the library:
+ This implementation establishes signal handlers during initialization,
+ e.g., <STRONG>initscr</STRONG> or <STRONG>newterm</STRONG>. Applications which must handle these signals
+ should set up the corresponding handlers <EM>after</EM> initializing the li-
+ brary:
<STRONG>SIGINT</STRONG>
- The handler <EM>attempts</EM> to cleanup the screen on exit.
- Although it <EM>usually</EM> works as expected, there are lim-
- itations:
+ The handler <EM>attempts</EM> to cleanup the screen on exit. Although it
+ <EM>usually</EM> works as expected, there are limitations:
- <STRONG>o</STRONG> Walking the <STRONG>SCREEN</STRONG> list is unsafe, since all list
- management is done without any signal blocking.
+ <STRONG>o</STRONG> Walking the <STRONG>SCREEN</STRONG> list is unsafe, since all list management
+ is done without any signal blocking.
- <STRONG>o</STRONG> On systems which have <STRONG>REENTRANT</STRONG> turned on,
- <STRONG>set_term</STRONG> uses functions which could deadlock or
- misbehave in other ways.
+ <STRONG>o</STRONG> On systems which have <STRONG>REENTRANT</STRONG> turned on, <STRONG>set_term</STRONG> uses func-
+ tions which could deadlock or misbehave in other ways.
- <STRONG>o</STRONG> <STRONG>endwin</STRONG> calls other functions, many of which use
- stdio or other library functions which are clear-
- ly unsafe.
+ <STRONG>o</STRONG> <STRONG>endwin</STRONG> calls other functions, many of which use stdio or other
+ library functions which are clearly unsafe.
<STRONG>SIGTERM</STRONG>
- This uses the same handler as <STRONG>SIGINT</STRONG>, with the same
- limitations. It is not mentioned in X/Open Curses,
- but is more suitable for this purpose than <STRONG>SIGQUIT</STRONG>
- (which is used in debugging).
+ This uses the same handler as <STRONG>SIGINT</STRONG>, with the same limitations.
+ It is not mentioned in X/Open Curses, but is more suitable for
+ this purpose than <STRONG>SIGQUIT</STRONG> (which is used in debugging).
<STRONG>SIGTSTP</STRONG>
- This handles the <EM>stop</EM> signal, used in job control.
- When resuming the process, this implementation dis-
- cards pending input with <STRONG>flushinput</STRONG> (see
- <STRONG><A HREF="curs_util.3x.html">curs_util(3x)</A></STRONG>), and repaints the screen assuming that
- it has been completely altered. It also updates the
- saved terminal modes with <STRONG>def_shell_mode</STRONG> (see
- <STRONG><A HREF="curs_kernel.3x.html">curs_kernel(3x)</A></STRONG>).
+ This handles the <EM>stop</EM> signal, used in job control. When resuming
+ the process, this implementation discards pending input with
+ <STRONG>flushinput</STRONG> (see <STRONG><A HREF="curs_util.3x.html">curs_util(3x)</A></STRONG>), and repaints the screen assuming
+ that it has been completely altered. It also updates the saved
+ terminal modes with <STRONG>def_shell_mode</STRONG> (see <STRONG><A HREF="curs_kernel.3x.html">curs_kernel(3x)</A></STRONG>).
<STRONG>SIGWINCH</STRONG>
- This handles the window-size changes which were ini-
- tially ignored in the standardization efforts. The
- handler sets a (signal-safe) variable which is later
- tested in <STRONG>wgetch</STRONG> (see <STRONG><A HREF="curs_getch.3x.html">curs_getch(3x)</A></STRONG>). If <STRONG>keypad</STRONG> has
- been enabled for the corresponding window, <STRONG>wgetch</STRONG> re-
- turns the key symbol <STRONG>KEY_RESIZE</STRONG>. At the same time,
- <STRONG>wgetch</STRONG> calls <STRONG>resizeterm</STRONG> to adjust the standard screen
- <STRONG>stdscr</STRONG>, and update other data such as <STRONG>LINES</STRONG> and <STRONG>COLS</STRONG>.
+ This handles the window-size changes which were ignored in the
+ standardization efforts. The handler sets a (signal-safe) vari-
+ able which is later tested in <STRONG>wgetch</STRONG> (see <STRONG><A HREF="curs_getch.3x.html">curs_getch(3x)</A></STRONG>). If
+ <STRONG>keypad</STRONG> has been enabled for the corresponding window, <STRONG>wgetch</STRONG> re-
+ turns the key symbol <STRONG>KEY_RESIZE</STRONG>. At the same time, <STRONG>wgetch</STRONG> calls
+ <STRONG>resizeterm</STRONG> to adjust the standard screen <STRONG>stdscr</STRONG>, and update other
+ data such as <STRONG>LINES</STRONG> and <STRONG>COLS</STRONG>.
</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
- <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_kernel.3x.html">curs_kernel(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>,
- <STRONG><A HREF="curs_slk.3x.html">curs_slk(3x)</A></STRONG>, <STRONG><A HREF="curs_terminfo.3x.html">curs_terminfo(3x)</A></STRONG>, <STRONG><A HREF="curs_util.3x.html">curs_util(3x)</A></STRONG>, <STRONG>curs_vari-</STRONG>
- <STRONG><A HREF="curs_variables.3x.html">ables(3x)</A></STRONG>.
+ <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_kernel.3x.html">curs_kernel(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>, <STRONG><A HREF="curs_slk.3x.html">curs_slk(3x)</A></STRONG>, <STRONG>curs_ter-</STRONG>
+ <STRONG><A HREF="curs_terminfo.3x.html">minfo(3x)</A></STRONG>, <STRONG><A HREF="curs_util.3x.html">curs_util(3x)</A></STRONG>, <STRONG><A HREF="curs_variables.3x.html">curs_variables(3x)</A></STRONG>.
- <STRONG><A HREF="curs_initscr.3x.html">curs_initscr(3x)</A></STRONG>
+
<STRONG><A HREF="curs_initscr.3x.html">curs_initscr(3x)</A></STRONG>
</PRE>
<div class="nav">
<ul>
</ul>
</li>
<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
-<li><a href="#h2-NOTES">NOTES</a></li>
<li><a href="#h2-PORTABILITY">PORTABILITY</a>
<ul>
<li><a href="#h3-Differences">Differences</a></li>
projects / ncurses.git / blobdiff