$ ); echo $? echoed 0,all other shells echo 2.

[unix-history] / usr / src / bin / sh / output.h

/*-
* Copyright (c) 1991, 1993
*      The Regents of the University of California.  All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* %sccs.include.redist.c%
*
*      @(#)output.h    8.2 (Berkeley) %G%
*/

#ifndef OUTPUT_INCL

#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif

struct output {
       char *nextc;
       int nleft;
       char *buf;
       int bufsize;
       short fd;
       short flags;
};

extern struct output output;
extern struct output errout;
extern struct output memout;
extern struct output *out1;
extern struct output *out2;

void open_mem __P((char *, int, struct output *));
void out1str __P((const char *));
void out2str __P((const char *));
void outstr __P((const char *, struct output *));
void emptyoutbuf __P((struct output *));
void flushall __P((void));
void flushout __P((struct output *));
void freestdout __P((void));
void outfmt __P((struct output *, char *, ...));
void out1fmt __P((char *, ...)); 
void dprintf __P((char *, ...));
void fmtstr __P((char *, int, char *, ...));
void doformat __P((struct output *, char *, va_list));
int xwrite __P((int, char *, int));
int xioctl __P((int, unsigned long, char *));

#define outc(c, file)   (--(file)->nleft < 0? (emptyoutbuf(file), *(file)->nextc++ = (c)) : (*(file)->nextc++ = (c)))
#define out1c(c)        outc(c, out1);
#define out2c(c)        outc(c, out2);

#define OUTPUT_INCL
#endif