experimental threaded libc - kernel only

1 files changed, 109 insertions, 0 deletions

diff --git a/lib/libpthread/uthread/uthread_execve.c b/lib/libpthread/uthread/uthread_execve.c
new file mode 100644
index 00000000000..5f40e1c560e
--- /dev/null
+++ b/lib/libpthread/uthread/uthread_execve.c
@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by John Birrell.
+ * 4. Neither the name of the author nor the names of any co-contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL 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 REGENTS 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.
+ *
+ */
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#ifdef _THREAD_SAFE
+#include <pthread.h>
+#include "pthread_private.h"
+
+int 
+execve(const char *name, char *const * argv, char *const * envp)
+{
+	int		flags;
+	int             i;
+	int             ret;
+	struct sigaction act;
+	struct sigaction oact;
+	struct itimerval itimer;
+
+	/* Disable the interval timer: */
+	itimer.it_interval.tv_sec  = 0;
+	itimer.it_interval.tv_usec = 0;
+	itimer.it_value.tv_sec     = 0;
+	itimer.it_value.tv_usec    = 0;
+	setitimer(ITIMER_VIRTUAL, &itimer, NULL);
+
+	/* Close the pthread kernel pipe: */
+	_thread_sys_close(_thread_kern_pipe[0]);
+	_thread_sys_close(_thread_kern_pipe[1]);
+
+	/*
+	 * Enter a loop to set all file descriptors to blocking
+	 * if they were not created as non-blocking:
+	 */
+	for (i = 0; i < _thread_dtablesize; i++) {
+		/* Check if this file descriptor is in use: */
+		if (_thread_fd_table[i] != NULL &&
+			!(_thread_fd_table[i]->flags & O_NONBLOCK)) {
+			/* Get the current flags: */
+			flags = _thread_sys_fcntl(i, F_GETFL, NULL);
+			/* Clear the nonblocking file descriptor flag: */
+			_thread_sys_fcntl(i, F_SETFL, flags & ~O_NONBLOCK);
+		}
+	}
+
+	/* Enter a loop to adopt the signal actions for the running thread: */
+	for (i = 1; i < NSIG; i++) {
+		/* Check for signals which cannot be caught: */
+		if (i == SIGKILL || i == SIGSTOP) {
+			/* Don't do anything with these signals. */
+		} else {
+			/* Check if ignoring this signal: */
+			if (_thread_sigact[i - 1].sa_handler == SIG_IGN) {
+				/* Continue to ignore this signal: */
+				act.sa_handler = SIG_IGN;
+			} else {
+				/* Use the default handler for this signal: */
+				act.sa_handler = SIG_DFL;
+			}
+
+			/* Copy the mask and flags for this signal: */
+			act.sa_mask = _thread_sigact[i - 1].sa_mask;
+			act.sa_flags = _thread_sigact[i - 1].sa_flags;
+
+			/* Change the signal action for the process: */
+			_thread_sys_sigaction(i, &act, &oact);
+		}
+	}
+
+	/* Execute the process: */
+	_thread_sys_sigprocmask(SIG_SETMASK, &_thread_run->sigmask, NULL);
+
+	/* Execute the process: */
+	ret = _thread_sys_execve(name, argv, envp);
+
+	/* Return the completion status: */
+	return (ret);
+}
+#endif