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62 lines
2.0 KiB
Diff
62 lines
2.0 KiB
Diff
From 63bb934c9e48d3ba1dc7f8001d423ea84b9a00c2 Mon Sep 17 00:00:00 2001
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From: Marian Buschsieweke <marian.buschsieweke@ovgu.de>
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Date: Thu, 19 Jan 2023 17:18:18 +0100
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Subject: [PATCH] lineedit: Handle SIGWINCH gracefully
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Since 1.16.0 a resize of the terminal emulator resulted in ash printing
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a new command line. This fixes the issue by retrying read_key() in
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lineedit_read_key() on SIGWINCH, rendering reception of SIGWINCH
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transparent to callers of read_line_input().
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Fixes https://bugs.busybox.net/show_bug.cgi?id=15256
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---
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libbb/lineedit.c | 11 +++++++++--
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1 file changed, 9 insertions(+), 2 deletions(-)
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diff --git a/libbb/lineedit.c b/libbb/lineedit.c
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index d6b2e76ff..a47d9e508 100644
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--- a/libbb/lineedit.c
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+++ b/libbb/lineedit.c
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@@ -2149,7 +2149,7 @@ static void cmdedit_setwidth(void)
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redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor);
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}
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-static void win_changed(int nsig UNUSED_PARAM)
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+static void win_changed(int nsig)
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{
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if (S.ok_to_redraw) {
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/* We are in read_key(), safe to redraw immediately */
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@@ -2157,6 +2157,7 @@ static void win_changed(int nsig UNUSED_PARAM)
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cmdedit_setwidth();
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fflush_all();
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errno = sv_errno;
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+ bb_got_signal = nsig;
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} else {
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/* Signal main loop that redraw is necessary */
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S.SIGWINCH_count++;
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@@ -2186,7 +2187,9 @@ static int lineedit_read_key(char *read_key_buffer, int timeout)
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* Note: read_key sets errno to 0 on success.
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*/
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for (;;) {
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- if ((state->flags & LI_INTERRUPTIBLE) && bb_got_signal) {
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+ if ((state->flags & LI_INTERRUPTIBLE) && bb_got_signal
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+ && (bb_got_signal != SIGWINCH)
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+ ) {
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errno = EINTR;
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return -1;
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}
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@@ -2197,6 +2200,10 @@ static int lineedit_read_key(char *read_key_buffer, int timeout)
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IF_FEATURE_EDITING_WINCH(S.ok_to_redraw = 0;)
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if (errno != EINTR)
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break;
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+ if (bb_got_signal == SIGWINCH) {
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+ bb_got_signal = 0;
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+ continue;
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+ }
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if (state->flags & LI_INTERRUPTIBLE) {
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/* LI_INTERRUPTIBLE bails out on EINTR,
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* but nothing really guarantees that bb_got_signal
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--
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2.39.1
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