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/*
SYSDEP.H
Declare operating system-dependent functions required by Yorick,
and define operating system-dependent macros.
$Id: sysdep.h,v 1.1 1993/08/27 18:32:09 munro Exp $
*/
/* Copyright (c) 1994. The Regents of the University of California.
All rights reserved. */
#ifndef SYSDEP_H
#define SYSDEP_H
/*--------------------------------------------------------------------------*/
/* If the header file setjmp.h cannot be found, you must find the
correct definition of the data type jmp_buf, which is normally
an array capable of holding enough state information to make the
longjmp. Put the declaration here. */
/* #define JMP_BUF_DECLARATION typedef int jmp_buf[???]; */
/* If the system math library does not have hypotenuse c= hypot(a,b),
define the following and nonc.c will create a reasonable facsimile: */
/* #define NO_HYPOT */
/* The following characters delimit directories in a pathname, or
pathnames in a list of pathnames. */
#define DIR_SEP '/'
#define DIR_SEP_S "/"
#define PATH_SEP ":"
#ifdef DOS_FILENAMES
#undef DIR_SEP
#define DIR_SEP '\\'
#undef DIR_SEP_S
#define DIR_SEP_S "\\"
#endif
#ifdef MAC_FILENAMES
#undef DIR_SEP
#define DIR_SEP ':'
#undef DIR_SEP_S
#define DIR_SEP_S ":"
#define PATH_SEP ";"
#define getenv GetStringResource
#endif
/* The following is used as the pathname separator delimiter in calls
to strtok to separate a list of directory names. */
#define PATH_SEP_DELIMIT PATH_SEP " \t"
/* BUFFERING
Since Yorick has its own caching scheme which involves potentially
variable buffer sizes (controlled by IOStream->blockSize), my first
thought was to use the ANSI setbuf function to "unbuffered" I/O.
This might seem like a good idea, but it turns out that both on UNIX
and MacIntosh (and probably DOS), "unbuffered" means to read the
stream one byte at a time, NOT to use the space passed to fread/fwrite
as the buffer, as I originally assumed.
On UNIX, the only solution is to use the raw read/write functions,
which simply use the space passed to them as the buffer. On the
MacIntosh under Think C, read/write are implemented as wrappers for
fread/fwrite, so you may as well define NO_UNIX_READ there; I don't
know what sort of performance hit you will take for not setting the
buffer size. The code using this is in binio.c (search for BUFFERING,
READ_BYTES, and WRITE_BYTES). FLUSH_BYTES is in cache.c */
#undef READ_BYTES
#undef WRITE_BYTES
#undef FLUSH_BYTES
#undef SEEK_BYTES
#undef TELL_BYTES
#ifndef NO_UNIX_READ
#define READ_BYTES(file, buffer, n) read(fileno(file), buffer, n)
#define WRITE_BYTES(file, buffer, n) write(fileno(file), buffer, n)
#define FLUSH_BYTES(file)
#define SEEK_BYTES(file, off, w) (lseek(fileno(file), off, w)==-1L)
#define TELL_BYTES(file) lseek(fileno(file), 0L, SEEK_CUR)
#else
/* Could also define READ_BYTES to some other non-UNIX alternative. */
#define READ_BYTES(file, buffer, n) fread(buffer, sizeof(char), n, file)
#define WRITE_BYTES(file, buffer, n) fwrite(buffer, sizeof(char), n, file)
#define FLUSH_BYTES(file) fflush(file)
#define SEEK_BYTES(file, off, w) fseek(file, off, w)
#define TELL_BYTES(file) ftell(file)
#endif
/* To use getrusage() and gettimeofday() instead of times(), try this: */
/* #define BSD_TIMER */
/* If neither works, a crude timer can be built using only ANSI standard
library routines with the following: */
/* #define CLOCK_FUNCTION clock
#define TICKS_PER_SEC CLOCKS_PER_SEC */
/* On a MacIntosh, the following works better: */
/* #include <pascal.h>
#include <Events.h>
#define CLOCK_FUNCTION TickCount
#define TICKS_PER_SEC 60 */
/* You may be able to do better by modifying Ytimer in sysdep.c. */
/* If the getpwnam function is not defined in <pwd.h>, set this */
/* #define NO_GETPWNAM */
/* If the readlink routine does not exist, set this */
/* #define NO_SOFT_LINKS */
/* sysdep.c defines the following functions:
int YGetLaunchDir(char *argv0)
- tracks down the directory in which Yorick's executable resides.
Include files necessary for startup are in subdirectories of
this directory.
int YstdinNB(int noWait)
- If you are running without Gist, this routine is necessary;
with Gist, it is never called. YstdinNB(0) pauses until
input arrives on stdin, then returns 0. YstdinNB(1) returns
immediately (NB is for "non-blocking") no matter what; its value
is 0 if and only if input is present on stdin, so that fgets
will not block.
void Ytimer(double *cpu, double *sys, double *wall)
- returns elapsed cpu, system, and wall clock times in seconds
(from an arbitrary origin -- used for timing differences only)
char *Ytimestamp(void)
- returns result of ANSI ctime, with trailing "\n" stripped
void SetSignals(int flags)
- sets up signal handling for keyboard interrupt (^C), floating
point interrupts, segmentation and illegal address violations,
and alignment errors
YSetCWD, YGetHome, YPATHstrtok, YExpandName, YNameTail, YNameHead,
YNameToHead, YIsAbsolute, YIsDotRelative are described in yio.h,
as is Ygetenv
*/
/*--------------------------------------------------------------------------*/
#endif
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