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#include "threadimpl.h"
static Lock thewaitlock;
static Channel *thewaitchan;
static void
execproc(void *v)
{
int pid;
Channel *c;
Execjob *e;
Waitmsg *w;
e = v;
pid = _threadspawn(e->fd, e->cmd, e->argv);
sendul(e->c, pid);
if(pid > 0){
w = waitfor(pid);
if((c = thewaitchan) != nil)
sendp(c, w);
else
free(w);
}
threadexits(nil);
}
int
_runthreadspawn(int *fd, char *cmd, char **argv)
{
int pid;
Execjob e;
e.fd = fd;
e.cmd = cmd;
e.argv = argv;
e.c = chancreate(sizeof(void*), 0);
proccreate(execproc, &e, 65536);
pid = recvul(e.c);
chanfree(e.c);
return pid;
}
Channel*
threadwaitchan(void)
{
if(thewaitchan)
return thewaitchan;
lock(&thewaitlock);
if(thewaitchan){
unlock(&thewaitlock);
return thewaitchan;
}
thewaitchan = chancreate(sizeof(Waitmsg*), 4);
chansetname(thewaitchan, "threadwaitchan");
unlock(&thewaitlock);
return thewaitchan;
}
int
_threadspawn(int fd[3], char *cmd, char *argv[])
{
int i, n, p[2], pid;
char exitstr[100];
if(pipe(p) < 0)
return -1;
if(fcntl(p[0], F_SETFD, 1) < 0 || fcntl(p[1], F_SETFD, 1) < 0){
close(p[0]);
close(p[1]);
return -1;
}
switch(pid = fork()){
case -1:
close(p[0]);
close(p[1]);
return -1;
case 0:
rfork(RFNOTEG);
dup2(fd[0], 0);
dup2(fd[1], 1);
dup2(fd[2], 2);
for(i=3; i<100; i++)
if(i != p[1])
close(i);
execvp(cmd, argv);
fprint(p[1], "%d", errno);
close(p[1]);
_exit(0);
}
close(p[1]);
n = read(p[0], exitstr, sizeof exitstr-1);
close(p[0]);
if(n > 0){ /* exec failed */
exitstr[n] = 0;
errno = atoi(exitstr);
return -1;
}
close(fd[0]);
if(fd[1] != fd[0])
close(fd[1]);
if(fd[2] != fd[1] && fd[2] != fd[0])
close(fd[2]);
return pid;
}
int
threadspawn(int fd[3], char *cmd, char *argv[])
{
return _runthreadspawn(fd, cmd, argv);
}
int
threadspawnl(int fd[3], char *cmd, ...)
{
char **argv, *s;
int n, pid;
va_list arg;
va_start(arg, cmd);
for(n=0; va_arg(arg, char*) != nil; n++)
;
n++;
va_end(arg);
argv = malloc(n*sizeof(argv[0]));
if(argv == nil)
return -1;
va_start(arg, cmd);
for(n=0; (s=va_arg(arg, char*)) != nil; n++)
argv[n] = s;
argv[n] = 0;
va_end(arg);
pid = threadspawn(fd, cmd, argv);
free(argv);
return pid;
}
int
_threadexec(Channel *cpid, int fd[3], char *cmd, char *argv[])
{
int pid;
pid = threadspawn(fd, cmd, argv);
if(cpid){
if(pid < 0)
chansendul(cpid, ~0);
else
chansendul(cpid, pid);
}
return pid;
}
void
threadexec(Channel *cpid, int fd[3], char *cmd, char *argv[])
{
if(_threadexec(cpid, fd, cmd, argv) >= 0)
threadexits("threadexec");
}
void
threadexecl(Channel *cpid, int fd[3], char *cmd, ...)
{
char **argv, *s;
int n, pid;
va_list arg;
va_start(arg, cmd);
for(n=0; va_arg(arg, char*) != nil; n++)
;
n++;
va_end(arg);
argv = malloc(n*sizeof(argv[0]));
if(argv == nil){
if(cpid)
chansendul(cpid, ~0);
return;
}
va_start(arg, cmd);
for(n=0; (s=va_arg(arg, char*)) != nil; n++)
argv[n] = s;
argv[n] = 0;
va_end(arg);
pid = _threadexec(cpid, fd, cmd, argv);
free(argv);
if(pid >= 0)
threadexits("threadexecl");
}
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