summaryrefslogtreecommitdiffstats
path: root/lib
diff options
context:
space:
mode:
authorpeter <peter@FreeBSD.org>2001-02-20 01:56:52 +0000
committerpeter <peter@FreeBSD.org>2001-02-20 01:56:52 +0000
commitf64981b39c5749e3ac5f623486862d9aa4fbd128 (patch)
treeb36dad284b8b696a4c71698e13a77dcd78c2c0ad /lib
parent0a9dc4546f3795ce82db64112b0b7be37cb4c246 (diff)
downloadFreeBSD-src-f64981b39c5749e3ac5f623486862d9aa4fbd128.zip
FreeBSD-src-f64981b39c5749e3ac5f623486862d9aa4fbd128.tar.gz
Place some hooks (__stdin, __stdout, __stderr) into libc for a future
ABI change. There is some serious evilness here to work around some gcc weaknesses. We need to know the sizeof(FILE) manually until __sF goes away in the next major bump. We have the size for Alpha and i386, missing is ia64, ppc and sparc* (and i386 with 64 bit longs). At some point down the track we can change the stdin etc #defines to stop hard coding the size of FILE into application binaries. Lots of head scratching and ideas and testing by: green, imp
Diffstat (limited to 'lib')
-rw-r--r--lib/libc/stdio/findfp.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/lib/libc/stdio/findfp.c b/lib/libc/stdio/findfp.c
index 4911400..3754258 100644
--- a/lib/libc/stdio/findfp.c
+++ b/lib/libc/stdio/findfp.c
@@ -77,6 +77,26 @@ FILE __sF[3] = {
std(__SWR|__SNBF, STDERR_FILENO)
};
+/*
+ * The following kludge is done to ensure enough binary compatibility
+ * with future versions of libc. Or rather it allows us to work with
+ * libraries that have been built with a newer libc that defines these
+ * symbols and expects libc to provide them. We only have need to support
+ * i386 and alpha because they are the only "old" systems we have deployed.
+ */
+#if defined(__i386__)
+#define FILE_SIZE 88
+#elif defined(__alpha__)
+#define FILE_SIZE 152
+#endif
+#ifndef FILE_SIZE
+#error "You must define FILE_SIZE for this platform"
+#endif
+#define X(loc, sym) __strong_reference(loc, sym)
+X(__sF + FILE_SIZE * 0, __stdin);
+X(__sF + FILE_SIZE * 1, __stdout);
+X(__sF + FILE_SIZE * 2, __stderr);
+
struct glue __sglue = { &uglue, 3, __sF };
static struct glue *lastglue = &uglue;
@@ -213,11 +233,14 @@ _cleanup()
/*
* __sinit() is called whenever stdio's internal variables must be set up.
*/
+#define SIZEMSG "WARNING: FILE_SIZE != sizeof(FILE)\n"
void
__sinit()
{
int i;
+ if (FILE_SIZE != sizeof(FILE))
+ write(2, SIZEMSG, sizeof(SIZEMSG) - 1);
THREAD_LOCK();
if (__sdidinit == 0) {
/* Set _extra for the usual suspects. */
OpenPOWER on IntegriCloud