151 lines
3.3 KiB
C
151 lines
3.3 KiB
C
/*
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* Listener loop for subsystem library libss.a.
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*
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* Header: /afs/rel-eng.athena.mit.edu/project/release/current/source/athena/athena.lib/ss/RCS/listen.c,v 1.2 90/07/12 12:28:58 epeisach Exp
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* $Locker: $
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*
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* Copyright 1987, 1988 by MIT Student Information Processing Board
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*
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* For copyright information, see copyright.h.
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*/
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#include "copyright.h"
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#include "ss_internal.h"
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#include <stdio.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <sys/param.h>
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#ifdef BSD
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#include <sgtty.h>
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#endif
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#ifndef lint
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static char const rcs_id[] =
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"Header: /afs/rel-eng.athena.mit.edu/project/release/current/source/athena/athena.lib/ss/RCS/listen.c,v 1.2 90/07/12 12:28:58 epeisach Exp ";
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#endif
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#ifdef POSIX
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#define sigtype void
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#else
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#define sigtype int
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#endif POSIX
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extern char *index();
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static ss_data *current_info;
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static jmp_buf listen_jmpb;
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static sigtype print_prompt()
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{
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#ifdef BSD
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/* put input into a reasonable mode */
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struct sgttyb ttyb;
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if (ioctl(fileno(stdin), TIOCGETP, &ttyb) != -1) {
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if (ttyb.sg_flags & (CBREAK|RAW)) {
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ttyb.sg_flags &= ~(CBREAK|RAW);
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(void) ioctl(0, TIOCSETP, &ttyb);
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}
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}
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#endif
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(void) fputs(current_info->prompt, stdout);
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(void) fflush(stdout);
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}
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static sigtype listen_int_handler()
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{
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putc('\n', stdout);
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longjmp(listen_jmpb, 1);
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}
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int ss_listen (sci_idx)
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int sci_idx;
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{
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register char *cp;
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register sigtype (*sig_cont)();
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register ss_data *info;
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sigtype (*sig_int)(), (*old_sig_cont)();
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char input[BUFSIZ];
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char buffer[BUFSIZ];
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char *end = buffer;
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int mask;
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int code;
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jmp_buf old_jmpb;
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ss_data *old_info = current_info;
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static sigtype print_prompt();
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current_info = info = ss_info(sci_idx);
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sig_cont = (sigtype (*)())0;
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info->abort = 0;
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mask = sigblock(sigmask(SIGINT));
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bcopy(listen_jmpb, old_jmpb, sizeof(jmp_buf));
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sig_int = signal(SIGINT, listen_int_handler);
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setjmp(listen_jmpb);
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(void) sigsetmask(mask);
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while(!info->abort) {
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print_prompt();
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*end = '\0';
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old_sig_cont = sig_cont;
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sig_cont = signal(SIGCONT, print_prompt);
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#ifdef mips
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/* The mips compiler breaks on determining the types,
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we help */
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if ( (sigtype *) sig_cont == (sigtype *) print_prompt)
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#else
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if ( sig_cont == print_prompt)
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#endif
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sig_cont = old_sig_cont;
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if (fgets(input, BUFSIZ, stdin) != input) {
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code = SS_ET_EOF;
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goto egress;
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}
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cp = index(input, '\n');
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if (cp) {
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*cp = '\0';
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if (cp == input)
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continue;
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}
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(void) signal(SIGCONT, sig_cont);
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for (end = input; *end; end++)
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;
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code = ss_execute_line (sci_idx, input);
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if (code == SS_ET_COMMAND_NOT_FOUND) {
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register char *c = input;
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while (*c == ' ' || *c == '\t')
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c++;
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cp = index (c, ' ');
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if (cp)
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*cp = '\0';
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cp = index (c, '\t');
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if (cp)
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*cp = '\0';
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ss_error (sci_idx, 0,
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"Unknown request \"%s\". Type \"?\" for a request list.",
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c);
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}
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}
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code = 0;
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egress:
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(void) signal(SIGINT, sig_int);
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bcopy(old_jmpb, listen_jmpb, sizeof(jmp_buf));
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current_info = old_info;
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return code;
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}
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void ss_abort_subsystem(sci_idx, code)
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int sci_idx, code;
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{
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ss_info(sci_idx)->abort = 1;
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ss_info(sci_idx)->exit_status = code;
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}
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void ss_quit(argc, argv, sci_idx, infop)
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int argc;
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char **argv;
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int sci_idx;
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pointer infop;
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{
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ss_abort_subsystem(sci_idx, 0);
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}
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