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Rip out the old __stdin/out/err stuff. It was completely 100% useless. :-(

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It was foiled because of dynamic copy relocations that caused compile-time
space to be reserved in .bss and at run time a blob of data was copied to
that space and everything used the .bss version..  The problem is that
the space is reserved at compile time, not runtime... So we *still* could
not change the size of FILE.  Sigh.  :-(

Replace it with something that does actually work and really does let us
make 'FILE' extendable.  It also happens to be the same as Linux does in
glibc, but has the slight cost of a pointer.  Note that this is the
same cost that 'fp = fopen(), fprintf(fp, ...); fclose(fp);' has.
Fortunately, actual references to stdin/out/err are not all that common
since we have implicit stdin/out/err-using versions of functions
(printf() vs. fprintf()).
This commit is contained in:
Peter Wemm 2001-08-13 21:48:44 +00:00
parent d55229b72e
commit 2b618987fe
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=81600
3 changed files with 18 additions and 16 deletions
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10
include/stdio.h
View File

@ -132,6 +132,9 @@ typedef struct __sFILE {
__BEGIN_DECLS
extern FILE __sF[];
extern FILE *__stdinp;
extern FILE *__stdoutp;
extern FILE *__stderrp;
__END_DECLS
#define __SLBF 0x0001 /* line buffered */
@ -194,9 +197,16 @@ __END_DECLS
#define SEEK_END 2 /* set file offset to EOF plus offset */
#endif
/* To be removed by 5.0-RELEASE */
#if (defined(__i386__) || defined(__alpha__)) && !defined(_FIXED_STDIO)
#define stdin (&__sF[0])
#define stdout (&__sF[1])
#define stderr (&__sF[2])
#else
#define stdin __stdinp
#define stdout __stdoutp
#define stderr __stderrp
#endif
/*
* Functions defined in ANSI C standard.

3
lib/libc/Makefile
View File

@ -9,7 +9,8 @@
LIB=c
SHLIB_MAJOR= 5
SHLIB_MINOR= 0
CFLAGS+=-DLIBC_RCS -DSYSLIBC_RCS -I${.CURDIR}/include
CFLAGS+=-DLIBC_RCS -DSYSLIBC_RCS -I${.CURDIR}/include -I${.CURDIR}/../../include
CFLAGS+=-DLIBC_MAJOR=${SHLIB_MAJOR}
AINC= -I${.CURDIR}/${MACHINE_ARCH}
CLEANFILES+=tags
INSTALL_PIC_ARCHIVE= yes

21
lib/libc/stdio/findfp.c
View File

@ -71,6 +71,9 @@ static struct glue uglue = { NULL, FOPEN_MAX - 3, usual };
static struct __sFILEX __sFX[3];
#if LIBC_MAJOR >= 6
static
#endif
FILE __sF[3] = {
std(__SRD, STDIN_FILENO),
std(__SWR, STDOUT_FILENO),
@ -84,18 +87,9 @@ FILE __sF[3] = {
* 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);
FILE *__stdinp = &__sF[0];
FILE *__stdoutp = &__sF[1];
FILE *__stderrp = &__sF[2];
struct glue __sglue = { &uglue, 3, __sF };
static struct glue *lastglue = &uglue;
@ -233,14 +227,11 @@ _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. */