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procd: improve early console handling

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The malta target is broken since procd is used
as init. The initramfs image boots fine, however
the console is not working.

Improve the early console handling to fix the
problem.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 37451
This commit is contained in:
Gabor Juhos 2013-07-19 17:12:44 +00:00
parent 0f0f250b66
commit adba04e53f
3 changed files with 90 additions and 1 deletions
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2
package/system/procd/Makefile
View file

@ -2,7 +2,7 @@ include $(TOPDIR)/rules.mk
PKG_NAME:=procd
PKG_VERSION:=2013-07-14
PKG_RELEASE=$(PKG_SOURCE_VERSION)
PKG_RELEASE=$(PKG_SOURCE_VERSION)-1
PKG_SOURCE_PROTO:=git
PKG_SOURCE_URL:=git://nbd.name/luci2/procd.git

49
package/system/procd/patches/0001-early-keep-stdio-files-open.patch Normal file
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@ -0,0 +1,49 @@
From 13ebb50d2789de7bd47cebe57e3f6eba58fdcc7e Mon Sep 17 00:00:00 2001
From: Gabor Juhos <juhosg@openwrt.org>
Date: Fri, 19 Jul 2013 08:43:35 +0200
Subject: [PATCH 1/2] early: keep stdio files open
At the end of the 'early_console' function, the
file descriptor is closed unconditionally. This
'close' call closes the stdio files if the fd
returned by the 'open(dev/console)' call equals
with any of the STD{IN,OUT,ERR}_FILENO values.
When this happens, all subsequent accesses to
the stdio files will fail and early console
access won't work.
To avoid this, don't close the file descriptor if
that equals with any of the STD*_FILENO values.
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
---
Note:
The issue happens if Linux is unable to open the
initial console before calling init. In this case,
the 'open(dev/console)' call in the 'early_console'
function returns with zero.
---
early.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/early.c b/early.c
index 27d0929..204623b 100644
--- a/early.c
+++ b/early.c
@@ -65,7 +65,11 @@ static void early_console(const char *dev)
dup2(dd, STDIN_FILENO);
dup2(dd, STDOUT_FILENO);
dup2(dd, STDERR_FILENO);
- close(dd);
+
+ if (dd != STDIN_FILENO &&
+ dd != STDOUT_FILENO &&
+ dd != STDERR_FILENO)
+ close(dd);
}
static void early_env(void)
--
1.7.10

40
package/system/procd/patches/0002-early-remove-superfluous-close-of-stdio-file-descrip.patch Normal file
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@ -0,0 +1,40 @@
From 1edd25cfa0a26dac1ca5d49bce479ebdea336437 Mon Sep 17 00:00:00 2001
From: Gabor Juhos <juhosg@openwrt.org>
Date: Fri, 19 Jul 2013 08:21:17 +0200
Subject: [PATCH 2/2] early: remove superfluous close of stdio file
descriptors
'man dup2' says:
dup2() makes newfd be the copy of oldfd, closing newfd first if
necessary, but note the following:
* If oldfd is not a valid file descriptor, then the call fails,
and newfd is not closed.
* If oldfd is a valid file descriptor, and newfd has the same
value as oldfd, then dup2() does nothing, and returns newfd.
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
---
early.c | 4 ----
1 file changed, 4 deletions(-)
diff --git a/early.c b/early.c
index 204623b..f9e3277 100644
--- a/early.c
+++ b/early.c
@@ -53,10 +53,6 @@ static void early_console(const char *dev)
mkdev("*console", 0600);
dd = open(dev, O_RDWR);
- close(STDIN_FILENO);
- close(STDOUT_FILENO);
- close(STDERR_FILENO);
-
if (dd < 0) {
ERROR("Failed to open %s\n", dev);
return;
--
1.7.10