[{"id":3679065,"web_url":"http://patchwork.ozlabs.org/comment/3679065/","msgid":"<10f96e1a-dcd9-49f4-aff2-1549f88e50a4@redhat.com>","list_archive_url":null,"date":"2026-04-19T08:43:05","subject":"Re: [PATCH] monitor: Add `clear` command","submitter":{"id":2701,"url":"http://patchwork.ozlabs.org/api/people/2701/","name":"Paolo Bonzini","email":"pbonzini@redhat.com"},"content":"On 4/18/26 19:23, Dr. David Alan Gilbert wrote:\n> * AlanoSong@163.com (AlanoSong@163.com) wrote:\n>> The monitor screen can be cluttered after executing commands\n>> like `info qtree`. It is useful to have a command to clear\n>> current screen, just like linux `clear` command do.\n>>\n>> This patch has been tested under monitors using stdio, vc,\n>> tcp socket, unix socket and serial interfaces.\n>>\n>> Signed-off-by: Alano Song \n> \n> Does typing ctrl-l not do it for you in your terminal?\n\nYeah, we should add support for Ctrl-L to the non-terminal backends \nindependent of this. However, backends such as socket do not use \nreadline so they also don't support it right now.\n\nPaolo\n\n> Dave\n> \n>> ---\n>> hmp-commands.hx | 14 ++++++++++++++\n>> include/monitor/hmp.h | 1 +\n>> monitor/hmp-cmds.c | 5 +++++\n>> 3 files changed, 20 insertions(+)\n>>\n>> diff --git a/hmp-commands.hx b/hmp-commands.hx\n>> index 5cc4788f12..95f9166732 100644\n>> --- a/hmp-commands.hx\n>> +++ b/hmp-commands.hx\n>> @@ -20,6 +20,20 @@ SRST\n>> Show the help for all commands or just for command *cmd*.\n>> ERST\n>> \n>> + {\n>> + .name = \"clear\",\n>> + .args_type = \"\",\n>> + .params = \"\",\n>> + .help = \"clear the monitor screen\",\n>> + .cmd = hmp_clear,\n>> + .flags = \"p\",\n>> + },\n>> +\n>> +SRST\n>> +``clear``\n>> + Clear the monitor screen.\n>> +ERST\n>> +\n>> {\n>> .name = \"commit\",\n>> .args_type = \"device:B\",\n>> diff --git a/include/monitor/hmp.h b/include/monitor/hmp.h\n>> index e222bea60c..9b66458d21 100644\n>> --- a/include/monitor/hmp.h\n>> +++ b/include/monitor/hmp.h\n>> @@ -165,6 +165,7 @@ void hmp_trace_event(Monitor *mon, const QDict *qdict);\n>> void hmp_trace_file(Monitor *mon, const QDict *qdict);\n>> void hmp_info_trace_events(Monitor *mon, const QDict *qdict);\n>> void hmp_help(Monitor *mon, const QDict *qdict);\n>> +void hmp_clear(Monitor *mon, const QDict *qdict);\n>> void hmp_info_help(Monitor *mon, const QDict *qdict);\n>> void hmp_info_sync_profile(Monitor *mon, const QDict *qdict);\n>> void hmp_info_history(Monitor *mon, const QDict *qdict);\n>> diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c\n>> index bc26b39d70..3e9485478e 100644\n>> --- a/monitor/hmp-cmds.c\n>> +++ b/monitor/hmp-cmds.c\n>> @@ -218,6 +218,11 @@ void hmp_help(Monitor *mon, const QDict *qdict)\n>> hmp_help_cmd(mon, qdict_get_try_str(qdict, \"name\"));\n>> }\n>> \n>> +void hmp_clear(Monitor *mon, const QDict *qdict)\n>> +{\n>> + monitor_printf(mon, \"\\x1b[3J\\x1b[2J\\x1b[H\");\n>> +}\n>> +\n>> void hmp_info_help(Monitor *mon, const QDict *qdict)\n>> {\n>> hmp_help_cmd(mon, \"info\");\n>> -- \n>> 2.43.0\n>>","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=H2zx6f5G;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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It is useful to have a command to clear\n>> current screen, just like linux `clear` command do.\n>> \n>> This patch has been tested under monitors using stdio, vc,\n>> tcp socket, unix socket and serial interfaces.\n>> \n>> Signed-off-by: Alano Song \n>\n>Does typing ctrl-l not do it for you in your terminal?\n>\n>Dave\n>\n\n\nYes, you are correct that ctrl-l provides basic screen clear,\nbut the new `clear` command clears both visible screen and\nscrollback buffer, just like `clear` command does on my Ubuntu terminal.\n\nI still believe that this patch is useful:\n1) Many linux users like me instinctively type `clear`\nwhen we want to tidy up the terminal.\n2) Not everyone is aware of or remembers the ctrl-l shortcut.\n A typed command is more discoverable, especially for new users\n or those who don't use terminal shortcuts regularly.\n\n\n>> ---\n>> hmp-commands.hx | 14 ++++++++++++++\n>> include/monitor/hmp.h | 1 +\n>> monitor/hmp-cmds.c | 5 +++++\n>> 3 files changed, 20 insertions(+)\n>> \n>> diff --git a/hmp-commands.hx b/hmp-commands.hx\n>> index 5cc4788f12..95f9166732 100644\n>> --- a/hmp-commands.hx\n>> +++ b/hmp-commands.hx\n>> @@ -20,6 +20,20 @@ SRST\n>> Show the help for all commands or just for command *cmd*.\n>> ERST\n>> \n>> + {\n>> + .name = \"clear\",\n>> + .args_type = \"\",\n>> + .params = \"\",\n>> + .help = \"clear the monitor screen\",\n>> + .cmd = hmp_clear,\n>> + .flags = \"p\",\n>> + },\n>> +\n>> +SRST\n>> +``clear``\n>> + Clear the monitor screen.\n>> +ERST\n>> +\n>> {\n>> .name = \"commit\",\n>> .args_type = \"device:B\",\n>> diff --git a/include/monitor/hmp.h b/include/monitor/hmp.h\n>> index e222bea60c..9b66458d21 100644\n>> --- a/include/monitor/hmp.h\n>> +++ b/include/monitor/hmp.h\n>> @@ -165,6 +165,7 @@ void hmp_trace_event(Monitor *mon, const QDict *qdict);\n>> void hmp_trace_file(Monitor *mon, const QDict *qdict);\n>> void hmp_info_trace_events(Monitor *mon, const QDict *qdict);\n>> void hmp_help(Monitor *mon, const QDict *qdict);\n>> +void hmp_clear(Monitor *mon, const QDict *qdict);\n>> void hmp_info_help(Monitor *mon, const QDict *qdict);\n>> void hmp_info_sync_profile(Monitor *mon, const QDict *qdict);\n>> void hmp_info_history(Monitor *mon, const QDict *qdict);\n>> diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c\n>> index bc26b39d70..3e9485478e 100644\n>> --- a/monitor/hmp-cmds.c\n>> +++ b/monitor/hmp-cmds.c\n>> @@ -218,6 +218,11 @@ void hmp_help(Monitor *mon, const QDict *qdict)\n>> hmp_help_cmd(mon, qdict_get_try_str(qdict, \"name\"));\n>> }\n>> \n>> +void hmp_clear(Monitor *mon, const QDict *qdict)\n>> +{\n>> + monitor_printf(mon, \"\\x1b[3J\\x1b[2J\\x1b[H\");\n>> +}\n>> +\n>> void hmp_info_help(Monitor *mon, const QDict *qdict)\n>> {\n>> hmp_help_cmd(mon, \"info\");\n>> -- \n>> 2.43.0\n>> \n>-- \n> -----Open up your eyes, open up your mind, open up your code ------- \n>/ Dr. David Alan Gilbert | Running GNU/Linux | Happy \\ \n>\\ dave @ treblig.org | | In Hex /\n> \\ _________________________|_____ http://www.treblig.org |_______/","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=163.com header.i=@163.com header.a=rsa-sha256\n header.s=s110527 header.b=nPS4LYO6;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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envelope-from=alanosong@163.com;\n helo=m16.mail.163.com","X-Spam_score_int":"-20","X-Spam_score":"-2.1","X-Spam_bar":"--","X-Spam_report":"(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001,\n HTML_MESSAGE=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001,\n RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no","X-Spam_action":"no action","X-Mailman-Approved-At":"Sun, 19 Apr 2026 07:54:51 -0400","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}},{"id":3679407,"web_url":"http://patchwork.ozlabs.org/comment/3679407/","msgid":"<3ece3e66.74c.19dab1a68c9.Coremail.alanosong@163.com>","list_archive_url":null,"date":"2026-04-20T13:35:27","subject":"Re: [PATCH] monitor: Add `clear` command","submitter":{"id":92155,"url":"http://patchwork.ozlabs.org/api/people/92155/","name":"Alano Song","email":"AlanoSong@163.com"},"content":"At 2026-04-19 01:23:46, \"Dr. David Alan Gilbert\" wrote:\n>* AlanoSong@163.com (AlanoSong@163.com) wrote:\n>> The monitor screen can be cluttered after executing commands\n>> like `info qtree`. It is useful to have a command to clear\n>> current screen, just like linux `clear` command do.\n>> \n>> This patch has been tested under monitors using stdio, vc,\n>> tcp socket, unix socket and serial interfaces.\n>> \n>> Signed-off-by: Alano Song \n>\n>Does typing ctrl-l not do it for you in your terminal?\n>\n>Dave\n>\n\n\nYes, you are correct that ctrl-l provides basic screen clear,\nbut the new `clear` command clears both visible screen and\nscrollback buffer, just like `clear` command does on my Ubuntu terminal.\n\nI still believe that this patch is useful:\n1) Many linux users like me instinctively type `clear`,\nwhen we want to tidy up the terminal.\n2) Not everyone is aware of or remembers the ctrl-l shortcut.\n A typed command is more discoverable, especially for new users\n or those who don't use terminal shortcuts regularly.\n\nBest Regards,\nAlano.\n\n// Re-send, it seems that the previous reply email is not visible in the mail list.\n\n\n>> ---\n>> hmp-commands.hx | 14 ++++++++++++++\n>> include/monitor/hmp.h | 1 +\n>> monitor/hmp-cmds.c | 5 +++++\n>> 3 files changed, 20 insertions(+)\n>> \n>> diff --git a/hmp-commands.hx b/hmp-commands.hx\n>> index 5cc4788f12..95f9166732 100644\n>> --- a/hmp-commands.hx\n>> +++ b/hmp-commands.hx\n>> @@ -20,6 +20,20 @@ SRST\n>> Show the help for all commands or just for command *cmd*.\n>> ERST\n>> \n>> + {\n>> + .name = \"clear\",\n>> + .args_type = \"\",\n>> + .params = \"\",\n>> + .help = \"clear the monitor screen\",\n>> + .cmd = hmp_clear,\n>> + .flags = \"p\",\n>> + },\n>> +\n>> +SRST\n>> +``clear``\n>> + Clear the monitor screen.\n>> +ERST\n>> +\n>> {\n>> .name = \"commit\",\n>> .args_type = \"device:B\",\n>> diff --git a/include/monitor/hmp.h b/include/monitor/hmp.h\n>> index e222bea60c..9b66458d21 100644\n>> --- a/include/monitor/hmp.h\n>> +++ b/include/monitor/hmp.h\n>> @@ -165,6 +165,7 @@ void hmp_trace_event(Monitor *mon, const QDict *qdict);\n>> void hmp_trace_file(Monitor *mon, const QDict *qdict);\n>> void hmp_info_trace_events(Monitor *mon, const QDict *qdict);\n>> void hmp_help(Monitor *mon, const QDict *qdict);\n>> +void hmp_clear(Monitor *mon, const QDict *qdict);\n>> void hmp_info_help(Monitor *mon, const QDict *qdict);\n>> void hmp_info_sync_profile(Monitor *mon, const QDict *qdict);\n>> void hmp_info_history(Monitor *mon, const QDict *qdict);\n>> diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c\n>> index bc26b39d70..3e9485478e 100644\n>> --- a/monitor/hmp-cmds.c\n>> +++ b/monitor/hmp-cmds.c\n>> @@ -218,6 +218,11 @@ void hmp_help(Monitor *mon, const QDict *qdict)\n>> hmp_help_cmd(mon, qdict_get_try_str(qdict, \"name\"));\n>> }\n>> \n>> +void hmp_clear(Monitor *mon, const QDict *qdict)\n>> +{\n>> + monitor_printf(mon, \"\\x1b[3J\\x1b[2J\\x1b[H\");\n>> +}\n>> +\n>> void hmp_info_help(Monitor *mon, const QDict *qdict)\n>> {\n>> hmp_help_cmd(mon, \"info\");\n>> -- \n>> 2.43.0\n>> \n>-- \n> -----Open up your eyes, open up your mind, open up your code ------- \n>/ Dr. David Alan Gilbert | Running GNU/Linux | Happy \\ \n>\\ dave @ treblig.org | | In Hex /\n> \\ _________________________|_____ http://www.treblig.org |_______/","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=163.com header.i=@163.com header.a=rsa-sha256\n header.s=s110527 header.b=iF3bnPlW;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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Mon, 20 Apr 2026 09:35:49 -0400","from alanosong$163.com ( [171.83.94.98] ) by\n ajax-webmail-wmsvr-40-108 (Coremail) ; Mon, 20 Apr 2026 21:35:27 +0800\n (CST)"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com;\n s=s110527; h=Date:From:To:Subject:Content-Type:MIME-Version:\n Message-ID; bh=jvAVN2T0gPShfyu+VqGyG5sfZxfqR1vhQ9wgxQIAvfg=; b=i\n F3bnPlWMqpO1rVJFmRUcnuVnq3PQkm18sGsUSLRI/8gfe1Nv4hTqtXMGQ/RZX0B4\n 8XNt10bRIObXKGqXRaVsCO+0QudUVDahplK0O74J10VZWFdXQQ7P5BRwt4jED13K\n E0/pCs6xe5C+zjesc4vs5IyA/R0gftAEOJWJ+GfFEU=","X-Originating-IP":"[171.83.94.98]","Date":"Mon, 20 Apr 2026 21:35:27 +0800 (CST)","From":"\"Alano Song\" ","To":"\"Dr. David Alan Gilbert\" ","Cc":"qemu-devel@nongnu.org, pbonzini@redhat.com","Subject":"Re: [PATCH] monitor: Add `clear` command","X-Priority":"3","X-Mailer":"Coremail Webmail Server Version 2023.4-cmXT build\n 20260403(27802f6d) Copyright (c) 2002-2026 www.mailtech.cn 163com","In-Reply-To":"","References":"<20260418133927.43012-1-AlanoSong@163.com>\n ","X-NTES-SC":"\n AL_Qu2cBPqSvUkp4SmbZOkcm0wQgOk5XsCwu/wk3YNec+MEijzd3DgnV3NnFlHc9vuvEyqqjh6+QCFs599dQo5XoSTTqO4BCwfxuX4XlwpC+A==","Content-Type":"multipart/alternative;\n boundary=\"----=_Part_7204_575024813.1776692127944\"","MIME-Version":"1.0","Message-ID":"<3ece3e66.74c.19dab1a68c9.Coremail.alanosong@163.com>","X-Coremail-Locale":"zh_CN","X-CM-TRANSID":"bCgvCgDHjGugK+ZpRKiSAA--.4412W","X-CM-SenderInfo":"xdod00pvrqwqqrwthudrp/xtbC0wAHG2nmK6AlNQAA3b","X-Coremail-Antispam":"1U5529EdanIXcx71UUUUU7vcSsGvfC2KfnxnUU==","Received-SPF":"pass client-ip=220.197.31.2; envelope-from=alanosong@163.com;\n helo=m16.mail.163.com","X-Spam_score_int":"-20","X-Spam_score":"-2.1","X-Spam_bar":"--","X-Spam_report":"(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001,\n HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001,\n RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no","X-Spam_action":"no action","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}},{"id":3680001,"web_url":"http://patchwork.ozlabs.org/comment/3680001/","msgid":"","list_archive_url":null,"date":"2026-04-21T17:52:54","subject":"Re: [PATCH] monitor: Add `clear` command","submitter":{"id":86099,"url":"http://patchwork.ozlabs.org/api/people/86099/","name":"Dr. David Alan Gilbert","email":"dave@treblig.org"},"content":"* Alano Song (alanosong@163.com) wrote:\n> At 2026-04-19 01:23:46, \"Dr. David Alan Gilbert\" wrote:\n> >* AlanoSong@163.com (AlanoSong@163.com) wrote:\n> >> The monitor screen can be cluttered after executing commands\n> >> like `info qtree`. It is useful to have a command to clear\n> >> current screen, just like linux `clear` command do.\n> >> \n> >> This patch has been tested under monitors using stdio, vc,\n> >> tcp socket, unix socket and serial interfaces.\n> >> \n> >> Signed-off-by: Alano Song \n> >\n> >Does typing ctrl-l not do it for you in your terminal?\n> >\n> >Dave\n> >\n\nHi Alano,\n\n> Yes, you are correct that ctrl-l provides basic screen clear,\n> but the new `clear` command clears both visible screen and\n> scrollback buffer, just like `clear` command does on my Ubuntu terminal.\n\n> I still believe that this patch is useful:\n> 1) Many linux users like me instinctively type `clear`\n> when we want to tidy up the terminal.\n> 2) Not everyone is aware of or remembers the ctrl-l shortcut.\n> A typed command is more discoverable, especially for new users\n> or those who don't use terminal shortcuts regularly.\n\nOK, mainly because of the difference with the scrollback buffer which I\nsee is different. (Ctrl-l is a great one to know, it works in almost\neverything, not just qemu, it's a basic ASCII control code going\nback about 60 years)\n\nNow to get to the magic line:\n\n> >> +void hmp_clear(Monitor *mon, const QDict *qdict)\n> >> +{\n> >> + monitor_printf(mon, \"\\x1b[3J\\x1b[2J\\x1b[H\");\n\nFirstly it would be great to comment this; as I read it,\nthis is:\n clear scrollback\n clear screen\n cursor back to top-left\n\nBut, this has a problem - for me on both mate-terminal and\nterminator (but not konsole), this doesn't completely clear\nthe scrollback; it clears most of the scrollback, but leaves\nabout one page; my guess is what happens here is you clear\nthe scrollback, but then the current screen goes into it\nafter/when you clear it.\n\nLooking at the output of the ncurses 'clear' command:\n\ndg@dalek:~$ clear|xxd -g 1\n00000000: 1b 5b 48 1b 5b 32 4a 1b 5b 33 4a .[H.[2J.[3J\n\nit's got them in the opposite order, cursor, clear screen, clear scrollback\nand that's fine in both mate-terminal/terminator & konsole.\n(This is Fedora 44 with vte291-0.84.0-1.fc44.x86_64 being used by mate-terminal).\n[I can't tell you if that's a bug in one or both of the terminals]\n\nSo please, flip the output around, and add a comment.\n\nThanks,\n\nDave\n> >> +}\n> >> +\n> >> void hmp_info_help(Monitor *mon, const QDict *qdict)\n> >> {\n> >> hmp_help_cmd(mon, \"info\");\n> >> -- \n> >> 2.43.0\n> >> \n> >-- \n> > -----Open up your eyes, open up your mind, open up your code ------- \n> >/ Dr. David Alan Gilbert | Running GNU/Linux | Happy \\ \n> >\\ dave @ treblig.org | | In Hex /\n> > \\ _________________________|_____ http://www.treblig.org |_______/","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=treblig.org header.i=@treblig.org header.a=rsa-sha256\n header.s=bytemarkmx header.b=phGVos0o;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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charset=iso-8859-1","Content-Disposition":"inline","In-Reply-To":"<142c6c8b.11e3.19da4b172c4.Coremail.alanosong@163.com>","X-Chocolate":"70 percent or better cocoa solids preferably","X-Operating-System":"Linux/6.12.74+deb13+1-amd64 (x86_64)","X-Uptime":"17:37:01 up 39 days, 18:50, 3 users, load average: 0.09, 0.03,\n 0.00","User-Agent":"Mutt/2.2.13 (2024-03-09)","Received-SPF":"pass client-ip=2a00:1098:5b::1; envelope-from=dg@treblig.org;\n helo=mx.treblig.org","X-Spam_score_int":"-20","X-Spam_score":"-2.1","X-Spam_bar":"--","X-Spam_report":"(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no","X-Spam_action":"no action","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}},{"id":3680638,"web_url":"http://patchwork.ozlabs.org/comment/3680638/","msgid":"<342571e6.a253.19db56f6cb9.Coremail.alanosong@163.com>","list_archive_url":null,"date":"2026-04-22T13:44:31","subject":"Re: [PATCH] monitor: Add `clear` command","submitter":{"id":92155,"url":"http://patchwork.ozlabs.org/api/people/92155/","name":"Alano Song","email":"AlanoSong@163.com"},"content":"At 2026-04-22 01:52:54, \"Dr. David Alan Gilbert\" wrote:\n>* Alano Song (alanosong@163.com) wrote:\n>> At 2026-04-19 01:23:46, \"Dr. David Alan Gilbert\" wrote:\n>> >* AlanoSong@163.com (AlanoSong@163.com) wrote:\n>> >> The monitor screen can be cluttered after executing commands\n>> >> like `info qtree`. It is useful to have a command to clear\n>> >> current screen, just like linux `clear` command do.\n>> >> \n>> >> This patch has been tested under monitors using stdio, vc,\n>> >> tcp socket, unix socket and serial interfaces.\n>> >> \n>> >> Signed-off-by: Alano Song \n>> >\n>> >Does typing ctrl-l not do it for you in your terminal?\n>> >\n>> >Dave\n>> >\n>\n>Hi Alano,\n>\n>> Yes, you are correct that ctrl-l provides basic screen clear,\n>> but the new `clear` command clears both visible screen and\n>> scrollback buffer, just like `clear` command does on my Ubuntu terminal.\n>\n>> I still believe that this patch is useful:\n>> 1) Many linux users like me instinctively type `clear`\n>> when we want to tidy up the terminal.\n>> 2) Not everyone is aware of or remembers the ctrl-l shortcut.\n>> A typed command is more discoverable, especially for new users\n>> or those who don't use terminal shortcuts regularly.\n>\n>OK, mainly because of the difference with the scrollback buffer which I\n>see is different. (Ctrl-l is a great one to know, it works in almost\n>everything, not just qemu, it's a basic ASCII control code going\n>back about 60 years)\n>\n\n\nHi, Dr.Gilbert,\nThanks for sharing that, got it :)\n\n\n>Now to get to the magic line:\n>\n>> >> +void hmp_clear(Monitor *mon, const QDict *qdict)\n>> >> +{\n>> >> + monitor_printf(mon, \"\\x1b[3J\\x1b[2J\\x1b[H\");\n>\n>Firstly it would be great to comment this; as I read it,\n>this is:\n> clear scrollback\n> clear screen\n> cursor back to top-left\n>\n>But, this has a problem - for me on both mate-terminal and\n>terminator (but not konsole), this doesn't completely clear\n>the scrollback; it clears most of the scrollback, but leaves\n>about one page; my guess is what happens here is you clear\n>the scrollback, but then the current screen goes into it\n>after/when you clear it.\n>\n>Looking at the output of the ncurses 'clear' command:\n>\n>dg@dalek:~$ clear|xxd -g 1\n>00000000: 1b 5b 48 1b 5b 32 4a 1b 5b 33 4a .[H.[2J.[3J\n\n>\n\n\nYou are right, the command order on my ubuntu24.04 is the same with you:\nalano@alano:~/code$ clear | xxd -g 1\n00000000: 1b 5b 48 1b 5b 32 4a 1b 5b 33 4a .[H.[2J.[3J\n\nSo I will correct the command order sent in patch :)\n\n\n>it's got them in the opposite order, cursor, clear screen, clear scrollback\n>and that's fine in both mate-terminal/terminator & konsole.\n>(This is Fedora 44 with vte291-0.84.0-1.fc44.x86_64 being used by mate-terminal).\n>[I can't tell you if that's a bug in one or both of the terminals]\n>\n>So please, flip the output around, and add a comment.\n>\n>Thanks,\n>\n\n>Dave\n\n\nI will add comment in code and help info in v2 patch.\n\nBest Regards,\nAlano.\n\n\n>> >> +}\n>> >> +\n>> >> void hmp_info_help(Monitor *mon, const QDict *qdict)\n>> >> {\n>> >> hmp_help_cmd(mon, \"info\");\n>> >> -- \n>> >> 2.43.0\n>> >> \n>> >-- \n>> > -----Open up your eyes, open up your mind, open up your code ------- \n>> >/ Dr. David Alan Gilbert | Running GNU/Linux | Happy \\ \n>> >\\ dave @ treblig.org | | In Hex /\n>> > \\ _________________________|_____ http://www.treblig.org |_______/\n>-- \n> -----Open up your eyes, open up your mind, open up your code ------- \n>/ Dr. David Alan Gilbert | Running GNU/Linux | Happy \\ \n>\\ dave @ treblig.org | | In Hex /\n> \\ _________________________|_____ http://www.treblig.org |_______/","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=163.com header.i=@163.com header.a=rsa-sha256\n header.s=s110527 header.b=cy3m9lZB;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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