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/* $Id: spawn.c,v 1.1.1.1 2000/06/27 01:47:58 amura Exp $ */
/*
* Spawn CLI for MS-DOS. (Tested only at MS-DOS 3.1)
*
* I make this file from UNIX System V spawn.c.
*/
/*
* $Log: spawn.c,v $
* Revision 1.1.1.1 2000/06/27 01:47:58 amura
* import to CVS
*
*/
/* 90.02.11 Modified for Ng 1.0 MS-DOS ver. by S.Yoshida */
#include "config.h" /* 90.12.20 by S.Yoshida */
#include "def.h"
#include <signal.h>
#include <process.h>
#if defined(__TURBOC__) && __TURBOC__ < 0x0200 /* 90.12.28 by Junn Ohta */
/* For Turbo-C 1.5 */
#include <errno.h>
static int (*oldfunc)();
static int (*curfunc)() = SIG_DFL;
extern void ctrlbrk(int (*fptr)(void));
static int sigfunc(void)
{
if (curfunc == SIG_DFL)
return 0; /* abort */
if (curfunc != SIG_IGN) {
oldfunc = curfunc;
curfunc = SIG_DFL;
(*oldfunc)();
}
return 1; /* resume */
}
int (*signal(int sig, int (*func)()))()
{
if (sig != SIGINT) {
errno = EINVAL;
return SIG_ERR;
}
ctrlbrk(sigfunc);
oldfunc = curfunc;
curfunc = func;
return oldfunc;
}
#endif /* __TURBOC__ */
char *shellp = NULL; /* Saved "SHELL" name. */
extern char *getenv();
/*
* On MS-DOS, we no gots job control, so always run
* a subshell using spawn. Bound to "C-C", and used
* as a subcommand by "C-Z".
*
* Returns 0 if the shell executed OK, something else if
* we couldn't start shell or it exited badly.
*/
/*ARGSUSED*/
spawncli(f, n) {
register void (*oisig)();
int status;
if (shellp == NULL) {
shellp = getenv("SHELL");
if (shellp == NULL)
shellp = getenv("shell");
if (shellp == NULL)
shellp = getenv("COMSPEC");
if (shellp == NULL)
shellp = getenv("comspec");
if (shellp == NULL)
shellp = "command.com"; /* Safer. */
}
ttcolor(CTEXT);
ttnowindow();
ttmove(nrow-1, 0);
if (epresf != FALSE) {
tteeol();
epresf = FALSE;
}
ttclose();
sgarbf = TRUE; /* Force repaint. */
oisig = signal(SIGINT, SIG_IGN);
#ifdef EXTD_DIR
dirend();
#endif
if (spawnlp(P_WAIT, shellp, NULL) == -1) {
status = FALSE;
} else {
status = TRUE;
}
(VOID) signal(SIGINT, oisig);
ttopen();
if(status == FALSE) {
ewprintf("Failed to run %s", shellp);
sleep(2); /* Show this message for 2 sec */
/* before refresh screen. */
}
return (status);
}
#ifndef NO_SHELL /* 91.01.10 by K.Maeda */
#if !defined(__TURBOC__) || __TURBOC__ >= 0x0200
#include <sys/types.h>
#endif /* __TURBOC__ */
#include <sys/stat.h>
#include <io.h>
char tempfile[128];
/*
* Call process in subshell.
* Execute COMMAND binding standard input to file INPUT.
* NULL as INPUT means standard input should be bound to
* /dev/null or whatever equivalent in your OS.
* All output during the execution (including standard error output)
* should go into a scratch file, whose name call_process() returns.
* Return value NULL means error in some stage of the execution.
* In that case, scratch file should be deleted.
*/
char *
call_process(command, input)
char *command;
char *input;
{
char buf[256];
char *tmp;
int ostdin, ostdout, ostderr, in, out, s;
extern char *mktemp();
char *temp_path;
temp_path = getenv("TMP");
if (temp_path == NULL)
temp_path = getenv("tmp");
if (temp_path == NULL)
temp_path = getenv("TEMP");
if (temp_path == NULL)
temp_path = getenv("temp");
tmp = tempfile;
if (temp_path && *temp_path) {
while (*tmp = *temp_path++) {
tmp++;
}
if (tmp[-1] != '/' && tmp[-1] != '\\') {
*tmp++ = '/';
}
}
strcpy(tmp, "ngXXXXXX");
if ((tmp = mktemp(tempfile)) == NULL) {
return NULL;
}
if ((in = open(input ? input : "nul", 0)) < 0) {
return NULL;
}
if ((out = creat(tmp, S_IREAD | S_IWRITE)) < 0) {
close(in);
return NULL;
}
ostdin = dup(0); ostdout = dup(1); ostderr = dup(2);
if (ostdin < 0 || ostdout < 0 || ostderr < 0) {
s = -1;
goto skip;
}
dup2(in, 0);
dup2(out, 1);
dup2(out, 2);
strcpy(buf, command);
#ifdef EXTD_DIR
ensurecwd();
#endif
s = system(buf);
close(in);
close(out);
dup2(ostdin, 0); dup2(ostdout, 1); dup2(ostderr, 2);
skip: close(ostdin); close(ostdout); close(ostderr);
if (s == -1) {
unlink(tmp);
return NULL;
}
return tmp;
}
#endif /* NO_SHELL */
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