85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
/*************
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* com_shell.c
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************/
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#include <stdio.h>
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#include "ngspice/ngspice.h"
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#include "ngspice/wordlist.h"
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#include "com_shell.h"
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#include "streams.h"
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#include "ngspice/cpextern.h"
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#ifdef _WIN32
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#define SHELL "cmd /k"
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#else
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#define SHELL "/bin/sh"
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#endif
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/* Fork a shell. */
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void
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com_shell(wordlist *wl)
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{
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int status;
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char *shell = NULL;
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shell = getenv("SHELL");
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if (shell == NULL) {
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shell = SHELL;
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}
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cp_ccon(FALSE);
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#ifdef HAVE_VFORK_H
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/* XXX Needs to switch process groups. Also, worry about suspend */
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/* Only bother for efficiency */
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pid = vfork();
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if (pid == 0) {
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fixdescriptors();
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if (wl == NULL) {
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execl(shell, shell, 0);
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_exit(99);
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} else {
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char * const com = wl_flatten(wl);
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execl("/bin/sh", "sh", "-c", com, 0);
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txfree(com);
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}
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} else {
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/* XXX Better have all these signals */
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svint = signal(SIGINT, SIG_DFL);
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svquit = signal(SIGQUIT, SIG_DFL);
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svtstp = signal(SIGTSTP, SIG_DFL);
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/* XXX Sig on proc group */
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do
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r = wait(NULL);
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while ((r != pid) && pid != -1);
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signal(SIGINT, (SIGNAL_FUNCTION) svint);
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signal(SIGQUIT, (SIGNAL_FUNCTION) svquit);
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signal(SIGTSTP, (SIGNAL_FUNCTION) svtstp);
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}
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#else
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/* Easier to forget about changing the io descriptors. */
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if (wl) {
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char * const com = wl_flatten(wl);
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status = system(com);
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if (status == -1) {
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(void) fprintf(cp_err, "Unable to execute \"%s\".\n", com);
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}
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txfree(com);
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}
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else {
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status = system(shell);
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if (status == -1) {
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(void) fprintf(cp_err, "Unable to execute \"%s\".\n", shell);
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}
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}
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cp_vset("shellstatus", CP_NUM, &status);
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#endif
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} /* end of function com_shell */
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