libthread: add threadspawnd
R=rsc
http://codereview.appspot.com/6742064
diff --git a/include/thread.h b/include/thread.h
index 43c35bf..c01cd51 100644
--- a/include/thread.h
+++ b/include/thread.h
@@ -175,6 +175,7 @@
void threadexec(Channel*, int[3], char*, char *[]);
void threadexecl(Channel*, int[3], char*, ...);
int threadspawn(int[3], char*, char*[]);
+int threadspawnd(int[3], char*, char*[], char*);
int threadspawnl(int[3], char*, ...);
Channel* threadwaitchan(void);
diff --git a/man/man3/thread.3 b/man/man3/thread.3
index 7f5cd69..0ebbddd 100644
--- a/man/man3/thread.3
+++ b/man/man3/thread.3
@@ -42,6 +42,7 @@
threadsetname,
threadsetstate,
threadspawn,
+threadspawnd,
threadspawnl,
threadwaitchan,
yield \- thread and proc management
@@ -124,6 +125,7 @@
.XX
int threadspawnl(int fd[3], char *file, ...)
int threadspawn(int fd[3], char *file, char *args[])
+int threadspawnd(int fd[3], char *file, char *args[], char *dir)
int threadexecl(Channel *cpid, int fd[3], char *file, ...)
int threadexec(Channel *cpid, int fd[3], char *file, char *args[])
Channel* threadwaitchan(void)
@@ -240,6 +242,8 @@
.IR threadexecl ,
.IR threadexits ,
.IR threadspawn ,
+.IR threadspawnd ,
+.IR threadspawnl ,
.IR alt ,
.IR send ,
and
@@ -419,6 +423,13 @@
but do not replace the current thread.
They return the pid of the invoked program on success, or
\-1 on error.
+.I Threadspawnd
+is like
+.I threadspawn
+but takes as its final argument the directory in which to run the invoked program.
+The child will attempt to change into that directory before running the program,
+but it is only best effort: failure to change into the directory does not
+stop the running of the program.
.PP
.I Threadwaitchan
returns a channel of pointers to
diff --git a/src/libthread/exec.c b/src/libthread/exec.c
index 1875eb9..62805ba 100644
--- a/src/libthread/exec.c
+++ b/src/libthread/exec.c
@@ -12,7 +12,7 @@
Waitmsg *w;
e = v;
- pid = _threadspawn(e->fd, e->cmd, e->argv);
+ pid = _threadspawn(e->fd, e->cmd, e->argv, e->dir);
sendul(e->c, pid);
if(pid > 0){
w = waitfor(pid);
@@ -25,7 +25,7 @@
}
int
-_runthreadspawn(int *fd, char *cmd, char **argv)
+_runthreadspawn(int *fd, char *cmd, char **argv, char *dir)
{
int pid;
Execjob e;
@@ -33,6 +33,7 @@
e.fd = fd;
e.cmd = cmd;
e.argv = argv;
+ e.dir = dir;
e.c = chancreate(sizeof(void*), 0);
proccreate(execproc, &e, 65536);
pid = recvul(e.c);
@@ -57,7 +58,7 @@
}
int
-_threadspawn(int fd[3], char *cmd, char *argv[])
+_threadspawn(int fd[3], char *cmd, char *argv[], char *dir)
{
int i, n, p[2], pid;
char exitstr[100];
@@ -77,6 +78,8 @@
return -1;
case 0:
/* can't RFNOTEG - will lose tty */
+ if(dir != nil )
+ chdir(dir); /* best effort */
dup2(fd[0], 0);
dup2(fd[1], 1);
dup2(fd[2], 2);
@@ -112,7 +115,13 @@
int
threadspawn(int fd[3], char *cmd, char *argv[])
{
- return _runthreadspawn(fd, cmd, argv);
+ return _runthreadspawn(fd, cmd, argv, nil);
+}
+
+int
+threadspawnd(int fd[3], char *cmd, char *argv[], char *dir)
+{
+ return _runthreadspawn(fd, cmd, argv, dir);
}
int
diff --git a/src/libthread/threadimpl.h b/src/libthread/threadimpl.h
index 9518f78..144a213 100644
--- a/src/libthread/threadimpl.h
+++ b/src/libthread/threadimpl.h
@@ -121,6 +121,7 @@
int *fd;
char *cmd;
char **argv;
+ char *dir;
Channel *c;
};
@@ -203,8 +204,8 @@
extern int _threadlock(Lock*, int, ulong);
extern void _threadunlock(Lock*, ulong);
extern void _pthreadinit(void);
-extern int _threadspawn(int*, char*, char**);
-extern int _runthreadspawn(int*, char*, char**);
+extern int _threadspawn(int*, char*, char**, char*);
+extern int _runthreadspawn(int*, char*, char**, char*);
extern void _threadsetupdaemonize(void);
extern void _threaddodaemonize(char*);
extern void _threadpexit(void);
