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/*
* [.vms]vms_popen.c -- substitute routines for missing pipe calls.
*/
/*
* Copyright (C) 1991 the Free Software Foundation, Inc.
*
* This file is part of GAWK, the GNU implementation of the
* AWK Progamming Language.
*
* GAWK is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 1, or (at your option)
* any later version.
*
* GAWK is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GAWK; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef NO_VMS_PIPES
#include "awk.h" /* really "../awk.h" */
#include <stdio.h>
#ifndef PIPES_SIMULATED
FILE *
popen( const char *command, const char *mode )
{
fatal(" Cannot open pipe `%s' (not implemented)", command);
/* NOT REACHED */
return 0;
}
int
pclose( FILE *current )
{
fatal(" Internal error ('pclose' not implemented)");
/* NOT REACHED */
return -1;
}
int
fork()
{
fatal(" Internal error ('fork' not implemented)");
/* NOT REACHED */
return -1;
}
#else PIPES_SIMULATED
/*
* Simulate pipes using temporary files; hope that the user
* doesn't expect pipe i/o to be interleaved with other i/o ;-}.
*
* This is essentially the same as the MSDOS version. The
* difference is that redirection is handled using LIB$SPAWN
* rather than constructing a command for system() which uses
* '<' or '>'.
*/
#include "vms.h"
#include <errno.h>
typedef enum { unopened = 0, reading, writing } pipemode;
static
struct {
char *command;
char *name;
pipemode pmode;
} pipes[_NFILE];
FILE *
popen( const char *command, const char *mode )
{
FILE *current;
char *name, *mktemp();
int cur, strcmp();
pipemode curmode;
if (strcmp(mode, "r") == 0)
curmode = reading;
else if (strcmp(mode, "w") == 0)
curmode = writing;
else
return NULL;
/* make a name for the temporary file */
if ((name = mktemp(strdup("sys$scratch:pipe_XXXX.tmp"))) == 0)
return NULL;
if (curmode == reading) {
/* an input pipe reads a temporary file created by the command */
vms_execute(command, (char *)0, name); /* 'command >tempfile' */
}
if ((current = fopen(name, mode)) == NULL) {
free(name);
return NULL;
}
cur = fileno(current);
pipes[cur].name = name;
pipes[cur].pmode = curmode;
pipes[cur].command = strdup(command);
return current;
}
int
pclose( FILE *current )
{
int rval, cur = fileno(current);
if (pipes[cur].pmode == unopened)
return -1; /* should never happen */
rval = fclose(current); /* close temp file; if reading, we're done */
if (pipes[cur].pmode == writing) {
/* an output pipe feeds the temporary file to the other program */
rval = vms_execute(pipes[cur].command, pipes[cur].name, (char *)0);
}
/* clean up */
unlink(pipes[cur].name); /* get rid of the temporary file */
pipes[cur].pmode = unopened;
free(pipes[cur].name), pipes[cur].name = 0;
free(pipes[cur].command), pipes[cur].command = 0;
return rval;
}
/*
* Create a process and execute a command in it. This is essentially
* the same as system() but allows us to specify SYS$INPUT (stdin)
* and/or SYS$OUTPUT (stdout) for the process.
* [With more work it could truly simulate a pipe using mailboxes.]
*/
int
vms_execute( const char *command, const char *input, const char *output )
{
Dsc cmd, in, out, *in_p, *out_p;
u_long sts, cmpltn_sts, LIB$SPAWN();
cmd.len = strlen(cmd.adr = (char *)command);
if (input)
in.len = strlen(in.adr = (char *)input), in_p = ∈
else
in_p = 0;
if (output)
out.len = strlen(out.adr = (char *)output), out_p = &out;
else
out_p = 0;
sts = LIB$SPAWN(&cmd, in_p, out_p, (long *)0,
(Dsc *)0, (u_long *)0, &cmpltn_sts);
if (vmswork(sts) && vmsfail(cmpltn_sts)) sts = cmpltn_sts;
if (vmsfail(sts)) {
errno = EVMSERR, vaxc$errno = sts;
return -1;
} else
return 0;
}
#endif /* PIPES_SIMULATED */
#endif /*!NO_VMS_PIPES*/
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