Add a process library with some stubs that the DTrace client needs.

These will be fleshed out as part of the DTrace userland tracing
development.

For now, the kernel tracing part of DTrace requires minimal functionality
for this library.

The API for this library is deliberately different from the libproc in
OpenSolaris due to licensing restrictions.

1 files changed, 133 insertions, 0 deletions

diff --git a/lib/libproc/proc_util.c b/lib/libproc/proc_util.c
new file mode 100644
index 0000000..0e7020e
--- /dev/null
+++ b/lib/libproc/proc_util.c
@@ -0,0 +1,133 @@
+/*-
+ * Copyright (c) 2008 John Birrell (jb@freebsd.org)
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include "_libproc.h"
+#include <errno.h>
+#include <unistd.h>
+#include <sys/ptrace.h>
+#include <sys/wait.h>
+#include <stdio.h>
+
+int
+proc_clearflags(struct proc_handle *phdl, int mask)
+{
+	if (phdl == NULL)
+		return (EINVAL);
+
+	phdl->flags &= ~mask;
+
+	return (0);
+}
+
+int
+proc_continue(struct proc_handle *phdl)
+{
+	if (phdl == NULL)
+		return (EINVAL);
+
+	if (ptrace(PT_CONTINUE, phdl->pid, (caddr_t)(uintptr_t) 1, 0) != 0)
+		return (errno);
+
+	phdl->status = PS_RUN;
+
+	return (0);
+}
+
+int
+proc_detach(struct proc_handle *phdl)
+{
+	if (phdl == NULL)
+		return (EINVAL);
+
+	if (ptrace(PT_DETACH, phdl->pid, 0, 0) != 0)
+		return (errno);
+
+	return (0);
+}
+
+int
+proc_getflags(struct proc_handle *phdl)
+{
+	if (phdl == NULL)
+		return (-1);
+
+	return(phdl->flags);
+}
+
+int
+proc_setflags(struct proc_handle *phdl, int mask)
+{
+	if (phdl == NULL)
+		return (EINVAL);
+
+	phdl->flags |= mask;
+
+	return (0);
+}
+
+int
+proc_state(struct proc_handle *phdl)
+{
+	if (phdl == NULL)
+		return (-1);
+
+	return (phdl->status);
+}
+
+int
+proc_wait(struct proc_handle *phdl)
+{
+	int status = 0;
+	struct kevent kev;
+
+	if (phdl == NULL)
+		return (EINVAL);
+
+	if (kevent(phdl->kq, NULL, 0, &kev, 1, NULL) <= 0)
+		return (0);
+
+	switch (kev.filter) {
+	/* Child has exited */
+	case EVFILT_PROC:  /* target has exited */
+		phdl->status = PS_UNDEAD;
+		break;
+	default:
+		break;
+	}
+
+	return (status);
+}
+
+pid_t
+proc_getpid(struct proc_handle *phdl)
+{
+	if (phdl == NULL)
+		return (-1);
+
+	return (phdl->pid);
+}