1 1544f909 2004-12-25 devnull #include "threadimpl.h"
  2 1544f909 2004-12-25 devnull 
  3 1544f909 2004-12-25 devnull static Lock thewaitlock;
  4 1544f909 2004-12-25 devnull static Channel *thewaitchan;
  5 1544f909 2004-12-25 devnull 
  6 1544f909 2004-12-25 devnull static void
  7 8cbd854a 2004-12-27 devnull execproc(void *v)
  8 955a2ca7 2004-12-27 devnull {
  9 8cbd854a 2004-12-27 devnull 	int pid;
 10 1544f909 2004-12-25 devnull 	Channel *c;
 11 8cbd854a 2004-12-27 devnull 	Execjob *e;
 12 1544f909 2004-12-25 devnull 	Waitmsg *w;
 13 1544f909 2004-12-25 devnull 
 14 8cbd854a 2004-12-27 devnull 	e = v;
 15 8cbd854a 2004-12-27 devnull 	pid = _threadspawn(e->fd, e->cmd, e->argv);
 16 8cbd854a 2004-12-27 devnull 	sendul(e->c, pid);
 17 8cbd854a 2004-12-27 devnull 	if(pid > 0){
 18 8cbd854a 2004-12-27 devnull 		w = waitfor(pid);
 19 1544f909 2004-12-25 devnull 		if((c = thewaitchan) != nil)
 20 1544f909 2004-12-25 devnull 			sendp(c, w);
 21 1544f909 2004-12-25 devnull 		else
 22 1544f909 2004-12-25 devnull 			free(w);
 23 1544f909 2004-12-25 devnull 	}
 24 8cbd854a 2004-12-27 devnull 	threadexits(nil);
 25 1544f909 2004-12-25 devnull }
 26 1544f909 2004-12-25 devnull 
 27 8cbd854a 2004-12-27 devnull int
 28 8cbd854a 2004-12-27 devnull _runthreadspawn(int *fd, char *cmd, char **argv)
 29 8cbd854a 2004-12-27 devnull {
 30 8cbd854a 2004-12-27 devnull 	int pid;
 31 8cbd854a 2004-12-27 devnull 	Execjob e;
 32 8cbd854a 2004-12-27 devnull 
 33 8cbd854a 2004-12-27 devnull 	e.fd = fd;
 34 8cbd854a 2004-12-27 devnull 	e.cmd = cmd;
 35 8cbd854a 2004-12-27 devnull 	e.argv = argv;
 36 8cbd854a 2004-12-27 devnull 	e.c = chancreate(sizeof(void*), 0);
 37 8cbd854a 2004-12-27 devnull 	proccreate(execproc, &e, 65536);
 38 8cbd854a 2004-12-27 devnull 	pid = recvul(e.c);
 39 8cbd854a 2004-12-27 devnull 	chanfree(e.c);
 40 8cbd854a 2004-12-27 devnull 	return pid;
 41 8cbd854a 2004-12-27 devnull }
 42 8cbd854a 2004-12-27 devnull 
 43 1544f909 2004-12-25 devnull Channel*
 44 1544f909 2004-12-25 devnull threadwaitchan(void)
 45 1544f909 2004-12-25 devnull {
 46 1544f909 2004-12-25 devnull 	if(thewaitchan)
 47 1544f909 2004-12-25 devnull 		return thewaitchan;
 48 1544f909 2004-12-25 devnull 	lock(&thewaitlock);
 49 1544f909 2004-12-25 devnull 	if(thewaitchan){
 50 1544f909 2004-12-25 devnull 		unlock(&thewaitlock);
 51 1544f909 2004-12-25 devnull 		return thewaitchan;
 52 1544f909 2004-12-25 devnull 	}
 53 1544f909 2004-12-25 devnull 	thewaitchan = chancreate(sizeof(Waitmsg*), 4);
 54 1544f909 2004-12-25 devnull 	chansetname(thewaitchan, "threadwaitchan");
 55 1544f909 2004-12-25 devnull 	unlock(&thewaitlock);
 56 1544f909 2004-12-25 devnull 	return thewaitchan;
 57 1544f909 2004-12-25 devnull }
 58 1544f909 2004-12-25 devnull 
 59 1544f909 2004-12-25 devnull int
 60 e127e40b 2004-12-27 devnull _threadspawn(int fd[3], char *cmd, char *argv[])
 61 1544f909 2004-12-25 devnull {
 62 1544f909 2004-12-25 devnull 	int i, n, p[2], pid;
 63 1544f909 2004-12-25 devnull 	char exitstr[100];
 64 1544f909 2004-12-25 devnull 
 65 1544f909 2004-12-25 devnull 	if(pipe(p) < 0)
 66 1544f909 2004-12-25 devnull 		return -1;
 67 1544f909 2004-12-25 devnull 	if(fcntl(p[0], F_SETFD, 1) < 0 || fcntl(p[1], F_SETFD, 1) < 0){
 68 1544f909 2004-12-25 devnull 		close(p[0]);
 69 1544f909 2004-12-25 devnull 		close(p[1]);
 70 1544f909 2004-12-25 devnull 		return -1;
 71 1544f909 2004-12-25 devnull 	}
 72 1544f909 2004-12-25 devnull 	switch(pid = fork()){
 73 1544f909 2004-12-25 devnull 	case -1:
 74 1544f909 2004-12-25 devnull 		close(p[0]);
 75 1544f909 2004-12-25 devnull 		close(p[1]);
 76 1544f909 2004-12-25 devnull 		return -1;
 77 1544f909 2004-12-25 devnull 	case 0:
 78 1544f909 2004-12-25 devnull 		dup2(fd[0], 0);
 79 1544f909 2004-12-25 devnull 		dup2(fd[1], 1);
 80 1544f909 2004-12-25 devnull 		dup2(fd[2], 2);
 81 1544f909 2004-12-25 devnull 		for(i=3; i<100; i++)
 82 1544f909 2004-12-25 devnull 			if(i != p[1])
 83 1544f909 2004-12-25 devnull 				close(i);
 84 1544f909 2004-12-25 devnull 		execvp(cmd, argv);
 85 1544f909 2004-12-25 devnull 		fprint(p[1], "%d", errno);
 86 1544f909 2004-12-25 devnull 		close(p[1]);
 87 1544f909 2004-12-25 devnull 		_exit(0);
 88 1544f909 2004-12-25 devnull 	}
 89 1544f909 2004-12-25 devnull 
 90 1544f909 2004-12-25 devnull 	close(p[1]);
 91 1544f909 2004-12-25 devnull 	n = read(p[0], exitstr, sizeof exitstr-1);
 92 1544f909 2004-12-25 devnull 	close(p[0]);
 93 1544f909 2004-12-25 devnull 	if(n > 0){	/* exec failed */
 94 1544f909 2004-12-25 devnull 		exitstr[n] = 0;
 95 1544f909 2004-12-25 devnull 		errno = atoi(exitstr);
 96 1544f909 2004-12-25 devnull 		return -1;
 97 1544f909 2004-12-25 devnull 	}
 98 1544f909 2004-12-25 devnull 
 99 1544f909 2004-12-25 devnull 	close(fd[0]);
100 1544f909 2004-12-25 devnull 	if(fd[1] != fd[0])
101 1544f909 2004-12-25 devnull 		close(fd[1]);
102 1544f909 2004-12-25 devnull 	if(fd[2] != fd[1] && fd[2] != fd[0])
103 1544f909 2004-12-25 devnull 		close(fd[2]);
104 1544f909 2004-12-25 devnull 	return pid;
105 1544f909 2004-12-25 devnull }
106 1544f909 2004-12-25 devnull 
107 1544f909 2004-12-25 devnull int
108 e127e40b 2004-12-27 devnull threadspawn(int fd[3], char *cmd, char *argv[])
109 e127e40b 2004-12-27 devnull {
110 e127e40b 2004-12-27 devnull 	return _runthreadspawn(fd, cmd, argv);
111 e127e40b 2004-12-27 devnull }
112 e127e40b 2004-12-27 devnull 
113 e127e40b 2004-12-27 devnull int
114 1544f909 2004-12-25 devnull _threadexec(Channel *cpid, int fd[3], char *cmd, char *argv[])
115 1544f909 2004-12-25 devnull {
116 1544f909 2004-12-25 devnull 	int pid;
117 1544f909 2004-12-25 devnull 
118 1544f909 2004-12-25 devnull 	pid = threadspawn(fd, cmd, argv);
119 1544f909 2004-12-25 devnull 	if(cpid){
120 1544f909 2004-12-25 devnull 		if(pid < 0)
121 1544f909 2004-12-25 devnull 			chansendul(cpid, ~0);
122 1544f909 2004-12-25 devnull 		else
123 1544f909 2004-12-25 devnull 			chansendul(cpid, pid);
124 1544f909 2004-12-25 devnull 	}
125 1544f909 2004-12-25 devnull 	return pid;
126 1544f909 2004-12-25 devnull }
127 1544f909 2004-12-25 devnull 
128 1544f909 2004-12-25 devnull void
129 1544f909 2004-12-25 devnull threadexec(Channel *cpid, int fd[3], char *cmd, char *argv[])
130 1544f909 2004-12-25 devnull {
131 1544f909 2004-12-25 devnull 	if(_threadexec(cpid, fd, cmd, argv) >= 0)
132 1544f909 2004-12-25 devnull 		threadexits("threadexec");
133 1544f909 2004-12-25 devnull }
134 1544f909 2004-12-25 devnull 
135 1544f909 2004-12-25 devnull void
136 1544f909 2004-12-25 devnull threadexecl(Channel *cpid, int fd[3], char *cmd, ...)
137 1544f909 2004-12-25 devnull {
138 1544f909 2004-12-25 devnull 	char **argv, *s;
139 1544f909 2004-12-25 devnull 	int n, pid;
140 1544f909 2004-12-25 devnull 	va_list arg;
141 1544f909 2004-12-25 devnull 
142 1544f909 2004-12-25 devnull 	va_start(arg, cmd);
143 1544f909 2004-12-25 devnull 	for(n=0; va_arg(arg, char*) != nil; n++)
144 1544f909 2004-12-25 devnull 		;
145 1544f909 2004-12-25 devnull 	n++;
146 1544f909 2004-12-25 devnull 	va_end(arg);
147 1544f909 2004-12-25 devnull 
148 1544f909 2004-12-25 devnull 	argv = malloc(n*sizeof(argv[0]));
149 1544f909 2004-12-25 devnull 	if(argv == nil){
150 1544f909 2004-12-25 devnull 		if(cpid)
151 1544f909 2004-12-25 devnull 			chansendul(cpid, ~0);
152 1544f909 2004-12-25 devnull 		return;
153 1544f909 2004-12-25 devnull 	}
154 1544f909 2004-12-25 devnull 
155 1544f909 2004-12-25 devnull 	va_start(arg, cmd);
156 1544f909 2004-12-25 devnull 	for(n=0; (s=va_arg(arg, char*)) != nil; n++)
157 1544f909 2004-12-25 devnull 		argv[n] = s;
158 1544f909 2004-12-25 devnull 	argv[n] = 0;
159 1544f909 2004-12-25 devnull 	va_end(arg);
160 1544f909 2004-12-25 devnull 
161 1544f909 2004-12-25 devnull 	pid = _threadexec(cpid, fd, cmd, argv);
162 1544f909 2004-12-25 devnull 	free(argv);
163 1544f909 2004-12-25 devnull 
164 1544f909 2004-12-25 devnull 	if(pid >= 0)
165 1544f909 2004-12-25 devnull 		threadexits("threadexecl");
166 1544f909 2004-12-25 devnull }
167 1544f909 2004-12-25 devnull