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/*
* PCNLTSS.C - NLTSS operating system routines
*
* Source Version: 2.0
* Software Release #92-0043
*
*/
#include "cpyright.h"
#include "ppc.h"
#include "baselb.h"
#define NO_CONTROLLEE_TO_SEND 3
#define NO_CONTROLLEE_ATTACHED 2
#define RECEIVE_STATE 6
#define MESSAGE_RECEIVED 0
char
**argv_cray;
static int
_PC_nltss_release(PROCESS *pp),
_PC_nltss_in_ready(PROCESS *pp),
_PC_nltss_close(PROCESS *pp),
_PC_nltss_status(PROCESS *pp),
_PC_nltss_flush(PROCESS *pp),
_PC_nltss_gets(char *bf, int len, PROCESS *pp),
_PC_nltss_printf(PROCESS *pp, char *buffer);
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* FORK - fake a UNIX fork under NLTSS
* - return 1 if successful
* - and -1 otherwise
*/
fork()
{int flag, len, i;
char bf[MAXLINE];
static id = 2;
PC_ERR_TRAP(-1);
flag = IZNITIAL(argv_cray[0], &Zero_I, &Zero_I);
if (flag != 0)
PC_error("COULDN'T INITIALIZE PROCESS (%d) - FORK", flag);
/* build the message in bf */
strcpy(bf, argv_cray[1]);
for (i = 2; argv_cray[i] != '\0'; i++)
{strcat(bf, " ");
strcat(bf, argv_cray[i]);};
len = strlen(bf);
flag = IZSNDME(bf, &len, &Zero_I);
if (flag != 0)
PC_error("COULDN'T SEND MESSAGE TO PROCESS (%d) - FORK", flag);
return(id++);}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* PC_MK_PROCESS - initialize and return a PROCESS */
PROCESS *PC_mk_process(argv, mode, type)
char **argv, *mode;
int type;
{PROCESS *pp;
argv_cray = argv;
pp = FMAKE(PROCESS, "PC_MK_PROCESS:pp");
pp->in_ring = FMAKE_N(unsigned char, SIZE_BUF,
"PC_MK_PROCESS:in_ring");
pp->ib_in = 0;
pp->ob_in = 0;
pp->type = PC_LOCAL;
pp->rcpu = -1;
pp->acpu = -1;
pp->line_mode = FALSE;
pp->line_sep = 0x1f;
pp->blocking = TRUE;
if (mode[1] == 'b')
{pp->vif = PD_open_vif(argv[0]);
pp->vif->stream = (FILE *) pp;}
else
pp->vif = NULL;
/* assign procedures to service this process */
pp->release = _PC_nltss_release;
pp->exec = NULL;
pp->close = _PC_nltss_close;
pp->statusp = _PC_nltss_status;
pp->flush = _PC_nltss_flush;
pp->read = _PC_bin_read;
pp->write = _PC_bin_write;
pp->printf = _PC_nltss_printf;
pp->gets = _PC_nltss_gets;
pp->in_ready = _PC_nltss_in_ready;
pp->setup = NULL;
if (type == PC_PARENT)
_PC_manage_process(pp);
return(pp);}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* _PC_NLTSS_RELEASE - close the file descriptors and release the PROCESS */
static int _PC_nltss_release(pp)
PROCESS *pp;
{if (pp == NULL)
return(FALSE);
SFREE(pp->in_ring);
SFREE(pp);
return(TRUE);}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* _PC_NLTSS_STATUS - return the status of the process */
static int _PC_nltss_status(pp)
PROCESS *pp;
{if (pp == NULL)
return(EXITED);
else
return(pp->status & ~CHANGED);}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* _PC_FGETS - get a string from the given file
* - if none are available or there is an return NULL
* - this is basically a non-blocking version of fgets
*/
char *_PC_fgets(bf, len, fp)
char *bf;
int len;
FILE *fp;
{int n;
#undef fgets
if (fp == stdin)
{if (IZGETMR(bf, &len, &_PC_unblock, &n))
{*bf = '\0';
bf = NULL;}
else
bf[n] = '\0';}
else
return(fgets(bf, len, fp));
return(bf);}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* _PC_NLTSS_GETS - do basic read operation on NLTSS */
static int _PC_nltss_gets(bf, len, pp)
char *bf;
int len;
PROCESS *pp;
{int flag, nrcv, oneless;
PC_ERR_TRAP(-1);
if (pp->status != RUNNING)
return(-1);
oneless = len - 1;
switch (flag = IZGETME(bf, &oneless, &Zero_I, &nrcv))
{case MESSAGE_RECEIVED :
if (strncmp(bf, "\r\x0a all done\r\x0a", 13) != 0)
{pp->status = RUNNING;
PC_flush(pp);
bf[nrcv] = '\0';}
/* case of "all done" */
else
{pp->status = EXITED;
bf = NULL;};
break;
case RECEIVE_STATE :
pp->status = RUNNING;
bf = NULL;
break;
case NO_CONTROLLEE_ATTACHED :
pp->status = STOPPED;
bf = NULL;
break;
default:
PC_error("COULDN'T GET MESSAGE FROM PROCESS (%d) - _PC_NLTSS_GETS",
flag);
bf = NULL;
break;};
return(nrcv);}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* _PC_NLTSS_IN_READY - return input ready status of process */
static _PC_nltss_in_ready(pp)
PROCESS *pp;
{return(_PC_unblock);}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* _PC_NLTSS_CLOSE - kill the process in effect closing the file
* - release the PROCESS (be careful about using pp
* - after this!!) clean up the details too
*/
static int _PC_nltss_close(pp)
PROCESS *pp;
{int in, out, id, flag, dummy;
PC_flush(pp);
PC_ERR_TRAP(FALSE);
if (pp == NULL)
return(FALSE);
in = pp->in;
out = pp->out;
id = pp->id;
_PC_delete_process(pp);
/* kill the process itself */
flag = IZDSCNEK(&dummy);
if (flag != 0)
PC_error("COULDN'T DISCONNECT PROCESS (%d) - _PC_NLTSS_CLOSE",
flag);
/* close the communications pipe */
pp->release(pp);
return(TRUE);}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* _PC_NLTSS_FLUSH - flush the input and output streams
* - for the given process
*/
static int_PC_nltss_flush(pp)
PROCESS *pp;
{int len1, flag;
char empty[1];
if (pp == NULL)
return(FALSE);
PC_ERR_TRAP(FALSE);
/* send a blank message to controllee (obviously) */
len1 = -1;
flag = IZSNDME(empty, &len1, &Zero_I);
if (flag == NO_CONTROLLEE_TO_SEND)
PC_error("COULDN'T SEND BLANK MESSAGE TO PROCESS (%d) - PC_FLUSH",
flag);
return(TRUE);}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* _PC_NLTSS_PRINTF - do an fprintf style output to a process */
static int _PC_nltss_printf(pp, buffer)
PROCESS *pp;
char *buffer;
{int len, flag;
len = strlen(buffer);
PC_ERR_TRAP(FALSE);
buffer[len] = '\0';
flag = IZSNDME(buffer, &len, &Zero_I);
if (flag != 0)
PC_error("ERROR WRITING TO PROCESS (%d) - PC_PRINTF", flag);
return(TRUE);}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
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