Revert "busybox: ash/hush fix for read-builtin command"

Revert this commit as it introduces a patchfile at a wrong location.
Since the patch was never effective, we can assume that this particular
commit was not properly tested.

This reverts commit dde9da46c1586c0bda54e7fa6de05f0fc76e557a.

Signed-off-by: Jo-Philipp Wich <[email protected]>

package/utils/busybox/501-ash-hush-fix-SIGCHLD-interrupting-read-builtin.patch

@@ -1,147 +0,0 @@
-From f5470419404d643070db99d058405b714695b817 Mon Sep 17 00:00:00 2001
-From: Denys Vlasenko <[email protected]>
-Date: Mon, 22 May 2017 19:34:45 +0200
-Subject: [PATCH] ash,hush: fix SIGCHLD interrupting read builtin
-
-function                                             old     new   delta
-readcmd                                              169     217     +48
-shell_builtin_read                                  1087    1097     +10
-localcmd                                             366     364      -2
-builtin_read                                         197     193      -4
-------------------------------------------------------------------------------
-(add/remove: 0/0 grow/shrink: 2/2 up/down: 58/-6)              Total: 52 bytes
-
-Signed-off-by: Denys Vlasenko <[email protected]>
-Signed-off-by: Bastian Bittorf <[email protected]>
----
- shell/ash.c                                  |  7 +++++++
- shell/ash_test/ash-read/read_SIGCHLD.right   |  2 ++
- shell/ash_test/ash-read/read_SIGCHLD.tests   |  4 ++++
- shell/hush.c                                 |  5 ++++-
- shell/hush_test/hush-read/read_SIGCHLD.right |  2 ++
- shell/hush_test/hush-read/read_SIGCHLD.tests |  4 ++++
- shell/shell_common.c                         | 20 +++++++++++---------
- 7 files changed, 34 insertions(+), 10 deletions(-)
- create mode 100644 shell/ash_test/ash-read/read_SIGCHLD.right
- create mode 100755 shell/ash_test/ash-read/read_SIGCHLD.tests
- create mode 100644 shell/hush_test/hush-read/read_SIGCHLD.right
- create mode 100755 shell/hush_test/hush-read/read_SIGCHLD.tests
-
-diff --git a/shell/ash.c b/shell/ash.c
-index 70ee15e..60c8ffe 100644
---- a/shell/ash.c
-+++ b/shell/ash.c
-@@ -13268,6 +13268,7 @@ readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
- 	/* "read -s" needs to save/restore termios, can't allow ^C
- 	 * to jump out of it.
- 	 */
-+ again:
- 	INT_OFF;
- 	r = shell_builtin_read(setvar0,
- 		argptr,
-@@ -13280,6 +13281,12 @@ readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
- 	);
- 	INT_ON;
- 
-+	if ((uintptr_t)r == 1 && errno == EINTR) {
-+		/* to get SIGCHLD: sleep 1 & read x; echo $x */
-+		if (pending_sig == 0)
-+			goto again;
-+	}
-+
- 	if ((uintptr_t)r > 1)
- 		ash_msg_and_raise_error(r);
- 
-diff --git a/shell/ash_test/ash-read/read_SIGCHLD.right b/shell/ash_test/ash-read/read_SIGCHLD.right
-new file mode 100644
-index 0000000..b3dc7ab
---- /dev/null
-+++ b/shell/ash_test/ash-read/read_SIGCHLD.right
-@@ -0,0 +1,2 @@
-+x='Ok'
-+exitcode:0
-diff --git a/shell/ash_test/ash-read/read_SIGCHLD.tests b/shell/ash_test/ash-read/read_SIGCHLD.tests
-new file mode 100755
-index 0000000..c5f673a
---- /dev/null
-+++ b/shell/ash_test/ash-read/read_SIGCHLD.tests
-@@ -0,0 +1,4 @@
-+x=BAD
-+{ sleep 0.4; echo Ok; } | { sleep 0.2 & read x; echo "x='$x'"; }
-+echo "exitcode:$?"
-+
-diff --git a/shell/hush.c b/shell/hush.c
-index e18920f..125463a 100644
---- a/shell/hush.c
-+++ b/shell/hush.c
-@@ -9038,6 +9038,9 @@ static int FAST_FUNC builtin_type(char **argv)
-  * - terminates shell (regardless of interactivity);
-  * if it has non-empty trap:
-  * - executes trap and returns to read;
-+ * SIGCHLD from children:
-+ * - does not interrupt read regardless of interactivity:
-+ *   try: sleep 1 & read x; echo $x
-  */
- static int FAST_FUNC builtin_read(char **argv)
- {
-@@ -9071,7 +9074,7 @@ static int FAST_FUNC builtin_read(char **argv)
- 
- 	if ((uintptr_t)r == 1 && errno == EINTR) {
- 		unsigned sig = check_and_run_traps();
--		if (sig && sig != SIGINT)
-+		if (sig != SIGINT)
- 			goto again;
- 	}
- 
-diff --git a/shell/hush_test/hush-read/read_SIGCHLD.right b/shell/hush_test/hush-read/read_SIGCHLD.right
-new file mode 100644
-index 0000000..b3dc7ab
---- /dev/null
-+++ b/shell/hush_test/hush-read/read_SIGCHLD.right
-@@ -0,0 +1,2 @@
-+x='Ok'
-+exitcode:0
-diff --git a/shell/hush_test/hush-read/read_SIGCHLD.tests b/shell/hush_test/hush-read/read_SIGCHLD.tests
-new file mode 100755
-index 0000000..c5f673a
---- /dev/null
-+++ b/shell/hush_test/hush-read/read_SIGCHLD.tests
-@@ -0,0 +1,4 @@
-+x=BAD
-+{ sleep 0.4; echo Ok; } | { sleep 0.2 & read x; echo "x='$x'"; }
-+echo "exitcode:$?"
-+
-diff --git a/shell/shell_common.c b/shell/shell_common.c
-index fb86e68..03b7d0b 100644
---- a/shell/shell_common.c
-+++ b/shell/shell_common.c
-@@ -204,15 +204,17 @@ shell_builtin_read(void FAST_FUNC (*setvar)(const char *name, const char *val),
- 		c = buffer[bufpos];
- 		if (c == '\0')
- 			continue;
--		if (backslash) {
--			backslash = 0;
--			if (c != '\n')
--				goto put;
--			continue;
--		}
--		if (!(read_flags & BUILTIN_READ_RAW) && c == '\\') {
--			backslash = 1;
--			continue;
-+		if (!(read_flags & BUILTIN_READ_RAW)) {
-+			if (backslash) {
-+				backslash = 0;
-+				if (c != '\n')
-+					goto put;
-+				continue;
-+			}
-+			if (c == '\\') {
-+				backslash = 1;
-+				continue;
-+			}
- 		}
- 		if (c == '\n')
- 			break;
--- 
-1.9.1
-