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/*
* SHPROC.C - C and Scheme Process control routines
*
* Source Version: 4.0
* Software Release #92-0043
*
*/
#include "cpyright.h"
#include "scheme.h"
static int
n_tries;
static void
SC_DECLARE(_SS_wr_process, (object *obj, object *strm)),
SC_DECLARE(_SS_rl_process, (object *obj));
static object
SC_DECLARE(*SS_opn_pr, (object *argl)),
SC_DECLARE(*SS_pr_runp, (object *obj)),
SC_DECLARE(*SS_cls_pr, (object *obj)),
SC_DECLARE(*SS_pr_rd_tries, (object *argl)),
SC_DECLARE(*SS_prp, (object *obj)),
SC_DECLARE(*SS_pr_stat, (object *obj)),
SC_DECLARE(*SS_pr_rd_line, (object *obj)),
SC_DECLARE(*SS_pr_sn_line, (object *argl));
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* SS_INST_PROC - install the primitives for process control */
void SS_inst_proc()
{
SS_install("process-open",
"Procedure: Exec a process and communicate with it",
SS_nargs,
SS_opn_pr, SS_PR_PROC);
SS_install("process-running?",
"Procedure: Returns #t if the process is still running",
SS_sargs,
SS_pr_runp, SS_PR_PROC);
SS_install("process-status",
"Procedure: Returns a list of the process id, in, out, status, reason",
SS_sargs,
SS_pr_stat, SS_PR_PROC);
SS_install("process-close",
"Procedure: Terminate a process",
SS_sargs,
SS_cls_pr, SS_PR_PROC);
SS_install("process?",
"Procedure: Returns #t if the object is a PROCESS_OBJ",
SS_sargs,
SS_prp, SS_PR_PROC);
SS_install("process-read-line",
"Procedure: Returns a string recieved from a process",
SS_sargs,
SS_pr_rd_line, SS_PR_PROC);
SS_install("process-send-line",
"Procedure: Send a string to a process",
SS_nargs,
SS_pr_sn_line, SS_PR_PROC);
SS_install("process-read-tries",
"Procedure: Get/Set number of attempts to read from unblocked process",
SS_nargs,
SS_pr_rd_tries, SS_PR_PROC);
n_tries = 100;
return;}
/*--------------------------------------------------------------------------*/
/* PROCESS PREDICATES */
/*--------------------------------------------------------------------------*/
/* SS_PRP - process? at Scheme level */
static object *SS_prp(obj)
object *obj;
{return(SS_processp(obj) ? SS_t : SS_f);}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* SS_PR_RUNP - process-running? in Scheme */
static object *SS_pr_runp(obj)
object *obj;
{if (!SS_processp(obj))
SS_error("OBJECT NOT PROCESS - PROCESS-RUNNING?", obj);
return((SS_PROCESS_STATUS(obj) == RUNNING) ? SS_t : SS_f);}
/*--------------------------------------------------------------------------*/
/* PROCESS PRIMITIVES */
/*--------------------------------------------------------------------------*/
/* SS_OPN_PR - process-open in Scheme */
static object *SS_opn_pr(argl)
object *argl;
{PROCESS *pp;
int n, i;
char **argv, *mode;
object *obj;
/* pull the mode off */
mode = NULL;
SS_args(argl,
SC_STRING_I, &mode,
0);
if (strchr("rwa", mode[0]) == NULL)
SS_error("BAD MODE - SS_OPN_PR", SS_car(argl));
argl = SS_cdr(argl);
/* the rest of the args constitute the command line */
n = (int) _SS_length(argl);
/* we need one extra for a NULL argument to terminate argv */
argv = FMAKE_N(char *, n+1, "SS_OPN_PR:argv");
for (i = 0 ; i < n; argl = SS_cdr(argl))
{obj = SS_car(argl);
if (SS_stringp(obj))
argv[i++] = SS_STRING_TEXT(obj);
else if (SS_variablep(obj))
argv[i++] = SS_VARIABLE_NAME(obj);
else
SS_error("BAD OBJECT - PROCESS-OPEN", obj);};
argv[i] = NULL;
pp = PC_open(argv, NULL, mode);
PC_block_file(stdin);
if (pp == NULL)
SS_error("CAN'T OPEN PROCESS - PROCESS-OPEN", obj);
SFREE_N(argv, n);
obj = SS_mk_object(pp, PROCESS_OBJ, SELF_EV, NULL);
obj->print = _SS_wr_process;
obj->release = _SS_rl_process;
return(obj);}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* SS_CLS_PR - process-close in Scheme */
static object *SS_cls_pr(obj)
object *obj;
{
if (!SS_processp(obj))
SS_error("BAD PROCESS - PROCESS-CLOSE", obj);
PC_close(SS_PROCESS_VALUE(obj));
return(obj);}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* SS_PR_RD_TRIES - process-read-tries in Scheme */
static object *SS_pr_rd_tries(argl)
object *argl;
{
if (!SS_nullobjp(argl))
SS_args(argl,
SC_INTEGER_I, &n_tries,
0);
return(SS_mk_integer((long) n_tries));}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* _SS_WR_PROCESS - print a process object */
static void _SS_wr_process(obj, strm)
object *obj, *strm;
{PROCESS *pp;
int flag;
FILE *str;
str = SS_OUTSTREAM(strm);
pp = SS_PROCESS_VALUE(obj);
PRINT(str, "<PROCESS|%d-%d-%d-", pp->id, pp->in, pp->out);
flag = (pp->status & ~CHANGED);
switch (flag)
{case RUNNING : PRINT(str, "Running");
break;
case STOPPED : PRINT(str, "Stopped-");
break;
case EXITED : PRINT(str, "Exited-");
break;
case (EXITED | COREDUMPED) : PRINT(str, "Exited-Core-Dumped-");
break;
case SIGNALED : PRINT(str, "Signaled-");
break;
case (SIGNALED | COREDUMPED) : PRINT(str, "Signaled-Core-Dumped-");
break;
default : PRINT(str, "Unknown");
break;};
if (flag != RUNNING)
switch (flag)
{case STOPPED :
case EXITED :
case (EXITED | COREDUMPED) :
case SIGNALED :
case (SIGNALED | COREDUMPED) : PRINT(str, "%d", pp->reason);
default : break;};
PRINT(str, ">");
return;}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* _SS_RL_PROCESS - this is need for the garbage collector */
static void _SS_rl_process(obj)
object *obj;
{PROCESS *pp;
pp = SS_PROCESS_VALUE(obj);
PC_close(pp);
SFREE(pp);
SFREE(SS_OBJECT(obj));
return;}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* SS_PR_STAT - process-status at the Scheme level */
static object *SS_pr_stat(obj)
object *obj;
{PROCESS *pp;
int st, rs;
object *ret;
if (!SS_processp(obj))
SS_error("ARGUMENT NOT PROCESS - PROCESS-STATUS", obj);
pp = SS_PROCESS_VALUE(obj);
st = pp->status;
rs = (st == RUNNING) ? 0 : pp->reason;
ret = SS_make_list(SC_INTEGER_I, &(pp->id),
SC_INTEGER_I, &(pp->in),
SC_INTEGER_I, &(pp->out),
SC_INTEGER_I, &st,
SC_INTEGER_I, &rs,
0);
return(ret);}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* SS_PR_RD_LINE - process-read-line at Scheme level */
static object *SS_pr_rd_line(obj)
object *obj;
{int i;
char bf[LRG_TXT_BUFFER];
if (!SS_processp(obj))
SS_error("ARGUMENT NOT PROCESS - PROCESS-READ-LINE", obj);
for (i = 0; i < n_tries; i++)
{if (PC_gets(bf, LRG_TXT_BUFFER, SS_PROCESS_VALUE(obj)) != NULL)
return(SS_mk_string(bf));};
return(SS_null);}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
/* SS_PR_SN_LINE - process-send-line at Scheme level */
static object *SS_pr_sn_line(argl)
object *argl;
{int ret;
PROCESS *pp;
char *s;
pp = NULL;
s = NULL;
SS_args(argl,
PROCESS_OBJ, &pp,
SC_STRING_I, &s,
0);
ret = PC_printf(pp, "%s\n", s);
return(ret ? SS_t : SS_f);}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
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