1 8ad51794 2004-03-25 devnull #include <u.h>
  2 4dcd9af2 2004-04-15 devnull #include <signal.h>
  3 b4a659b6 2004-04-19 devnull #include <libc.h>
  4 8ad51794 2004-03-25 devnull #include "term.h"
  5 8ad51794 2004-03-25 devnull 
  6 5bd21066 2006-01-18 devnull int loginshell;
  7 5bd21066 2006-01-18 devnull 
  8 c6687d45 2004-09-21 devnull static void
  9 60535a5f 2004-12-26 devnull sys(char *buf, int devnull)
 10 c6687d45 2004-09-21 devnull {
 11 c6687d45 2004-09-21 devnull 	char buf2[100];
 12 c6687d45 2004-09-21 devnull 	char *f[20];
 13 c6687d45 2004-09-21 devnull 	int nf, pid;
 14 c6687d45 2004-09-21 devnull 
 15 60535a5f 2004-12-26 devnull 	notedisable("sys: child");
 16 c6687d45 2004-09-21 devnull 	strcpy(buf2, buf);
 17 c6687d45 2004-09-21 devnull 	nf = tokenize(buf2, f, nelem(f));
 18 c6687d45 2004-09-21 devnull 	f[nf] = nil;
 19 c6687d45 2004-09-21 devnull 	switch(pid = fork()){
 20 c6687d45 2004-09-21 devnull 	case 0:
 21 60535a5f 2004-12-26 devnull 		close(1);
 22 60535a5f 2004-12-26 devnull 		open("/dev/null", OREAD);
 23 60535a5f 2004-12-26 devnull 		close(2);
 24 60535a5f 2004-12-26 devnull 		open("/dev/null", OREAD);
 25 c6687d45 2004-09-21 devnull 		execvp(f[0], f);
 26 60535a5f 2004-12-26 devnull 		_exit(2);
 27 c6687d45 2004-09-21 devnull 	default:
 28 c6687d45 2004-09-21 devnull 		waitpid();
 29 2023d484 2017-11-27 0intro 		noteenable("sys: child");
 30 c6687d45 2004-09-21 devnull 	}
 31 c6687d45 2004-09-21 devnull }
 32 c6687d45 2004-09-21 devnull 
 33 8ad51794 2004-03-25 devnull int
 34 4dcd9af2 2004-04-15 devnull rcstart(int argc, char **argv, int *pfd, int *tfd)
 35 8ad51794 2004-03-25 devnull {
 36 a2705f20 2004-04-16 devnull 	int fd[2], i, pid;
 37 d3f21b70 2018-11-14 rsc 	char *cmd, *xargv[4];
 38 8ad51794 2004-03-25 devnull 	char slave[256];
 39 8ad51794 2004-03-25 devnull 	int sfd;
 40 8ad51794 2004-03-25 devnull 
 41 8ad51794 2004-03-25 devnull 	if(argc == 0){
 42 8ad51794 2004-03-25 devnull 		argc = 2;
 43 8ad51794 2004-03-25 devnull 		argv = xargv;
 44 8ad51794 2004-03-25 devnull 		argv[0] = getenv("SHELL");
 45 8ad51794 2004-03-25 devnull 		if(argv[0] == 0)
 46 8ad51794 2004-03-25 devnull 			argv[0] = "rc";
 47 8a6837e8 2006-01-18 devnull 		argv[1] = "-i";
 48 8ad51794 2004-03-25 devnull 		argv[2] = 0;
 49 d3f21b70 2018-11-14 rsc 		if(loginshell){
 50 d3f21b70 2018-11-14 rsc 			argv[2] = "-l";
 51 d3f21b70 2018-11-14 rsc 			argv[3] = 0;
 52 d3f21b70 2018-11-14 rsc 			argc = 3;
 53 d3f21b70 2018-11-14 rsc 		}
 54 8ad51794 2004-03-25 devnull 	}
 55 5bd21066 2006-01-18 devnull 	cmd = argv[0];
 56 5bd21066 2006-01-18 devnull 	if(loginshell){
 57 5bd21066 2006-01-18 devnull 		argv[0] = malloc(strlen(cmd)+2);
 58 5bd21066 2006-01-18 devnull 		strcpy(argv[0]+1, cmd);
 59 5bd21066 2006-01-18 devnull 		argv[0][0] = '-';
 60 5bd21066 2006-01-18 devnull 	}
 61 5bd21066 2006-01-18 devnull 
 62 8ad51794 2004-03-25 devnull 	/*
 63 8ad51794 2004-03-25 devnull 	 * fd0 is slave (tty), fd1 is master (pty)
 64 8ad51794 2004-03-25 devnull 	 */
 65 8ad51794 2004-03-25 devnull 	fd[0] = fd[1] = -1;
 66 60535a5f 2004-12-26 devnull 	if(getpts(fd, slave) < 0){
 67 60535a5f 2004-12-26 devnull 		exit(3);
 68 75024f0f 2004-03-26 devnull 		sysfatal("getpts: %r\n");
 69 60535a5f 2004-12-26 devnull 	}
 70 55d360f6 2005-07-13 devnull 	/*
 71 55d360f6 2005-07-13 devnull 	 * notedisable("sys: window size change");
 72 fa325e9b 2020-01-10 cross 	 *
 73 55d360f6 2005-07-13 devnull 	 * Can't disable because will be inherited by other programs
 74 55d360f6 2005-07-13 devnull 	 * like if you run an xterm from the prompt, and then xterm's
 75 fa325e9b 2020-01-10 cross 	 * resizes won't get handled right.  Sigh.
 76 1a24aaca 2005-07-21 devnull 	 *
 77 1a24aaca 2005-07-21 devnull 	 * Can't not disable because when we stty below we'll get a
 78 1a24aaca 2005-07-21 devnull 	 * signal, which will drop us into the thread library note handler,
 79 1a24aaca 2005-07-21 devnull 	 * which will get all confused because we just forked and thus
 80 fa325e9b 2020-01-10 cross 	 * have an unknown pid.
 81 1a24aaca 2005-07-21 devnull 	 *
 82 1a24aaca 2005-07-21 devnull 	 * So disable it internally.  ARGH!
 83 55d360f6 2005-07-13 devnull 	 */
 84 1a24aaca 2005-07-21 devnull 	notifyoff("sys: window size change");
 85 1a24aaca 2005-07-21 devnull 
 86 bf63f986 2013-08-06 rsc 	// This used to be TERM=9term but we don't know of anything that cares.
 87 bf63f986 2013-08-06 rsc 	// Worse, various cc have started assuming that TERM != dumb implies
 88 bf63f986 2013-08-06 rsc 	// the ability to understand ANSI escape codes. 9term will squelch them
 89 bf63f986 2013-08-06 rsc 	// but acme win does not.
 90 bf63f986 2013-08-06 rsc 	putenv("TERM", "dumb");
 91 bf63f986 2013-08-06 rsc 
 92 bf63f986 2013-08-06 rsc 	// Set $termprog to 9term or win for those who care about what kind of
 93 bf63f986 2013-08-06 rsc 	// dumb terminal this is.
 94 bf63f986 2013-08-06 rsc 	putenv("termprog", (char*)termprog);
 95 cfa9a6df 2018-03-23 0intro 	putenv("TERM_PROGRAM", (char*)termprog);
 96 bf63f986 2013-08-06 rsc 
 97 60535a5f 2004-12-26 devnull 	pid = fork();
 98 60535a5f 2004-12-26 devnull 	switch(pid){
 99 8ad51794 2004-03-25 devnull 	case 0:
100 8ad51794 2004-03-25 devnull 		sfd = childpty(fd, slave);
101 8ad51794 2004-03-25 devnull 		dup(sfd, 0);
102 8ad51794 2004-03-25 devnull 		dup(sfd, 1);
103 8ad51794 2004-03-25 devnull 		dup(sfd, 2);
104 60535a5f 2004-12-26 devnull 		sys("stty tabs -onlcr icanon echo erase '^h' intr '^?'", 0);
105 60535a5f 2004-12-26 devnull 		sys("stty onocr", 1);	/* not available on mac */
106 a2705f20 2004-04-16 devnull 		for(i=3; i<100; i++)
107 a2705f20 2004-04-16 devnull 			close(i);
108 c6687d45 2004-09-21 devnull 		signal(SIGINT, SIG_DFL);
109 c6687d45 2004-09-21 devnull 		signal(SIGHUP, SIG_DFL);
110 c6687d45 2004-09-21 devnull 		signal(SIGTERM, SIG_DFL);
111 5bd21066 2006-01-18 devnull 		execvp(cmd, argv);
112 8ad51794 2004-03-25 devnull 		fprint(2, "exec %s failed: %r\n", argv[0]);
113 60535a5f 2004-12-26 devnull 		_exit(2);
114 8ad51794 2004-03-25 devnull 		break;
115 8ad51794 2004-03-25 devnull 	case -1:
116 8ad51794 2004-03-25 devnull 		sysfatal("proc failed: %r");
117 8ad51794 2004-03-25 devnull 		break;
118 8ad51794 2004-03-25 devnull 	}
119 8ad51794 2004-03-25 devnull 	*pfd = fd[1];
120 a2705f20 2004-04-16 devnull 	close(fd[0]);
121 a2705f20 2004-04-16 devnull 	if(tfd){
122 a2705f20 2004-04-16 devnull 		if((*tfd = open(slave, OREAD)) < 0)
123 a2705f20 2004-04-16 devnull 			sysfatal("parent open %s: %r", slave);
124 a2705f20 2004-04-16 devnull 	}
125 8ad51794 2004-03-25 devnull 	return pid;
126 8ad51794 2004-03-25 devnull }
127 8ad51794 2004-03-25 devnull 
128 ef5c6a6e 2010-09-03 rsc struct {
129 ef5c6a6e 2010-09-03 rsc 	Lock l;
130 ef5c6a6e 2010-09-03 rsc 	char buf[1<<20];
131 ef5c6a6e 2010-09-03 rsc 	int r, w;
132 ef5c6a6e 2010-09-03 rsc } echo;
133 ef5c6a6e 2010-09-03 rsc 
134 ef5c6a6e 2010-09-03 rsc void
135 ef5c6a6e 2010-09-03 rsc echoed(char *p, int n)
136 ef5c6a6e 2010-09-03 rsc {
137 ef5c6a6e 2010-09-03 rsc 	lock(&echo.l);
138 ef5c6a6e 2010-09-03 rsc 	if(echo.r > 0) {
139 ef5c6a6e 2010-09-03 rsc 		memmove(echo.buf, echo.buf+echo.r, echo.w-echo.r);
140 ef5c6a6e 2010-09-03 rsc 		echo.w -= echo.r;
141 ef5c6a6e 2010-09-03 rsc 		echo.r = 0;
142 ef5c6a6e 2010-09-03 rsc 	}
143 ef5c6a6e 2010-09-03 rsc 	if(echo.w+n > sizeof echo.buf)
144 ef5c6a6e 2010-09-03 rsc 		echo.r = echo.w = 0;
145 ef5c6a6e 2010-09-03 rsc 	if(echo.w+n > sizeof echo.buf)
146 ef5c6a6e 2010-09-03 rsc 		n = 0;
147 ef5c6a6e 2010-09-03 rsc 	memmove(echo.buf+echo.w, p, n);
148 fa325e9b 2020-01-10 cross 	echo.w += n;
149 ef5c6a6e 2010-09-03 rsc 	unlock(&echo.l);
150 ef5c6a6e 2010-09-03 rsc }
151 ef5c6a6e 2010-09-03 rsc 
152 ef5c6a6e 2010-09-03 rsc int
153 ef5c6a6e 2010-09-03 rsc echocancel(char *p, int n)
154 ef5c6a6e 2010-09-03 rsc {
155 ef5c6a6e 2010-09-03 rsc 	int i;
156 ef5c6a6e 2010-09-03 rsc 
157 ef5c6a6e 2010-09-03 rsc 	lock(&echo.l);
158 ef5c6a6e 2010-09-03 rsc 	for(i=0; i<n; i++) {
159 ef5c6a6e 2010-09-03 rsc 		if(echo.r < echo.w) {
160 ef5c6a6e 2010-09-03 rsc 			if(echo.buf[echo.r] == p[i]) {
161 ef5c6a6e 2010-09-03 rsc 				echo.r++;
162 ef5c6a6e 2010-09-03 rsc 				continue;
163 ef5c6a6e 2010-09-03 rsc 			}
164 ef5c6a6e 2010-09-03 rsc 			if(echo.buf[echo.r] == '\n' && p[i] == '\r')
165 ef5c6a6e 2010-09-03 rsc 				continue;
166 ef5c6a6e 2010-09-03 rsc 			if(p[i] == 0x08) {
167 ef5c6a6e 2010-09-03 rsc 				if(i+2 <= n && p[i+1] == ' ' && p[i+2] == 0x08)
168 ef5c6a6e 2010-09-03 rsc 					i += 2;
169 ef5c6a6e 2010-09-03 rsc 				continue;
170 ef5c6a6e 2010-09-03 rsc 			}
171 ef5c6a6e 2010-09-03 rsc 		}
172 ef5c6a6e 2010-09-03 rsc 		echo.r = echo.w;
173 ef5c6a6e 2010-09-03 rsc 		break;
174 ef5c6a6e 2010-09-03 rsc 	}
175 ef5c6a6e 2010-09-03 rsc 	unlock(&echo.l);
176 ef5c6a6e 2010-09-03 rsc 	if(i > 0)
177 ef5c6a6e 2010-09-03 rsc 		memmove(p, p+i, n-i);
178 ef5c6a6e 2010-09-03 rsc 	return n-i;
179 ef5c6a6e 2010-09-03 rsc }
180 ef5c6a6e 2010-09-03 rsc 
181 ef5c6a6e 2010-09-03 rsc int
182 ef5c6a6e 2010-09-03 rsc dropcrnl(char *p, int n)
183 ef5c6a6e 2010-09-03 rsc {
184 ef5c6a6e 2010-09-03 rsc 	char *r, *w;
185 ef5c6a6e 2010-09-03 rsc 
186 ef5c6a6e 2010-09-03 rsc 	for(r=w=p; r<p+n; r++) {
187 ef5c6a6e 2010-09-03 rsc 		if(r+1<p+n && *r == '\r' && *(r+1) == '\n')
188 ef5c6a6e 2010-09-03 rsc 			continue;
189 ef5c6a6e 2010-09-03 rsc 		if(*r == 0x08) {
190 ef5c6a6e 2010-09-03 rsc 			if(r+2<=p+n && *(r+1) == ' ' && *(r+2) == 0x08)
191 ef5c6a6e 2010-09-03 rsc 				r += 2;
192 ef5c6a6e 2010-09-03 rsc 			continue;
193 ef5c6a6e 2010-09-03 rsc 		}
194 ef5c6a6e 2010-09-03 rsc 		*w++ = *r;
195 ef5c6a6e 2010-09-03 rsc 	}
196 ef5c6a6e 2010-09-03 rsc 	return w-p;
197 ef5c6a6e 2010-09-03 rsc }