A partial implementation of the procfs cmdline pseudo-file. This

is enough to satisfy things like StarOffice.  This is a hack, but doing
it properly would be a LOT of work, and would require extensive grovelling
around in the user address space to find the argv[].

Obtained from: Mostly from Andrzej Bialecki <abial@nask.pl>.

4 files changed, 51 insertions, 5 deletions

diff --git a/sys/miscfs/procfs/procfs.h b/sys/miscfs/procfs/procfs.h
index b727e16..619e1b2 100644
--- a/sys/miscfs/procfs/procfs.h
+++ b/sys/miscfs/procfs/procfs.h
@@ -37,7 +37,7 @@
  *	@(#)procfs.h	8.9 (Berkeley) 5/14/95
  *
  * From:
- *	$Id: procfs.h,v 1.19 1998/05/19 00:00:13 tegge Exp $
+ *	$Id: procfs.h,v 1.20 1998/07/07 04:08:44 bde Exp $
  */
 
 /*
@@ -56,7 +56,8 @@ typedef enum {
 	Pnote,		/* process notifier */
 	Pnotepg,	/* process group notifier */
 	Pmap,		/* memory map */
-	Ptype		/* executable type */
+	Ptype,		/* executable type */
+	Pcmdline	/* command line */
 } pfstype;
 
 /*
@@ -154,6 +155,7 @@ int procfs_doctl __P((struct proc *, struct proc *, struct pfsnode *pfsp, struct
 int procfs_dostatus __P((struct proc *, struct proc *, struct pfsnode *pfsp, struct uio *uio));
 int procfs_domap __P((struct proc *, struct proc *, struct pfsnode *pfsp, struct uio *uio));
 int procfs_dotype __P((struct proc *, struct proc *, struct pfsnode *pfsp, struct uio *uio));
+int procfs_docmdline __P((struct proc *, struct proc *, struct pfsnode *pfsp, struct uio *uio));
 
 /* Return 1 if process has special kernel digging privileges */
 int procfs_kmemaccess __P((struct proc *));
diff --git a/sys/miscfs/procfs/procfs_status.c b/sys/miscfs/procfs/procfs_status.c
index 3f1cccf..3176a64 100644
--- a/sys/miscfs/procfs/procfs_status.c
+++ b/sys/miscfs/procfs/procfs_status.c
@@ -37,7 +37,7 @@
  *	@(#)procfs_status.c	8.4 (Berkeley) 6/15/94
  *
  * From:
- *	$Id: procfs_status.c,v 1.10 1997/08/02 14:32:17 bde Exp $
+ *	$Id: procfs_status.c,v 1.11 1998/07/11 07:45:45 bde Exp $
  */
 
 #include <sys/param.h>
@@ -147,3 +147,40 @@ procfs_dostatus(curp, p, pfs, uio)
 
 	return (error);
 }
+
+int
+procfs_docmdline(curp, p, pfs, uio)
+	struct proc *curp;
+	struct proc *p;
+	struct pfsnode *pfs;
+	struct uio *uio;
+{
+	char *ps;
+	int xlen;
+	int error;
+	char psbuf[256];
+
+	if (uio->uio_rw != UIO_READ)
+		return (EOPNOTSUPP);
+
+	/*
+	 * For now, this is a hack.  To implement this fully would require
+	 * groping around in the process address space to follow argv etc.
+	 */
+	ps = psbuf;
+	bcopy(p->p_comm, ps, MAXCOMLEN);
+	ps[MAXCOMLEN] = '\0';
+	ps += strlen(ps);
+
+	ps += sprintf(ps, "\n");
+
+	xlen = ps - psbuf;
+	xlen -= uio->uio_offset;
+	ps = psbuf + uio->uio_offset;
+	xlen = min(xlen, uio->uio_resid);
+	if (xlen <= 0)
+		error = 0;
+	else
+		error = uiomove(ps, xlen, uio);
+	return (error);
+}
diff --git a/sys/miscfs/procfs/procfs_subr.c b/sys/miscfs/procfs/procfs_subr.c
index 2156b12..813232c 100644
--- a/sys/miscfs/procfs/procfs_subr.c
+++ b/sys/miscfs/procfs/procfs_subr.c
@@ -36,7 +36,7 @@
  *
  *	@(#)procfs_subr.c	8.6 (Berkeley) 5/14/95
  *
- *	$Id: procfs_subr.c,v 1.20 1997/12/09 05:03:41 sef Exp $
+ *	$Id: procfs_subr.c,v 1.21 1997/12/12 03:33:43 sef Exp $
  */
 
 #include <sys/param.h>
@@ -181,6 +181,7 @@ loop:
 	case Ptype:
 	case Pmap:
 	case Pstatus:
+	case Pcmdline:
 		pfs->pfs_mode = (VREAD) |
 				(VREAD >> 3) |
 				(VREAD >> 6);
@@ -282,6 +283,10 @@ procfs_rw(ap)
 		rtval = procfs_dotype(curp, p, pfs, uio);
 		break;
 
+	case Pcmdline:
+		rtval = procfs_docmdline(curp, p, pfs, uio);
+		break;
+
 	default:
 		rtval = EOPNOTSUPP;
 		break;
diff --git a/sys/miscfs/procfs/procfs_vnops.c b/sys/miscfs/procfs/procfs_vnops.c
index 6879b08..daab08f 100644
--- a/sys/miscfs/procfs/procfs_vnops.c
+++ b/sys/miscfs/procfs/procfs_vnops.c
@@ -36,7 +36,7 @@
  *
  *	@(#)procfs_vnops.c	8.18 (Berkeley) 5/21/95
  *
- *	$Id: procfs_vnops.c,v 1.61 1998/07/11 07:45:46 bde Exp $
+ *	$Id: procfs_vnops.c,v 1.62 1998/12/04 22:54:51 archie Exp $
  */
 
 /*
@@ -101,6 +101,7 @@ static struct proc_target {
 	{ DT_REG, N("notepg"),	Pnotepg,	NULL },
 	{ DT_REG, N("map"), 	Pmap,		procfs_validmap },
 	{ DT_REG, N("etype"),	Ptype,		procfs_validtype },
+	{ DT_REG, N("cmdline"),	Pcmdline,	NULL },
 #undef N
 };
 static const int nproc_targets = sizeof(proc_targets) / sizeof(proc_targets[0]);
@@ -573,6 +574,7 @@ procfs_getattr(ap)
 	case Pstatus:
 	case Pnote:
 	case Pnotepg:
+	case Pcmdline:
 		vap->va_nlink = 1;
 		vap->va_uid = procp->p_ucred->cr_uid;
 		vap->va_gid = procp->p_ucred->cr_gid;