From 1e06aef681a078dbc51ec36a602c9be9735b8ab9 Mon Sep 17 00:00:00 2001
From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Date: Sat, 3 Dec 2011 06:47:50 +0100
Subject: sanbox: add linux_execve and linux_exec command

this will allow to execute a program of the host from barebox

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 arch/sandbox/mach-sandbox/include/mach/linux.h |  2 ++
 arch/sandbox/os/common.c                       | 22 ++++++++++++++++++++++
 commands/Kconfig                               |  6 ++++++
 commands/Makefile                              |  1 +
 4 files changed, 31 insertions(+)

diff --git a/arch/sandbox/mach-sandbox/include/mach/linux.h b/arch/sandbox/mach-sandbox/include/mach/linux.h
index 7c2386d247..5917fe93de 100644
--- a/arch/sandbox/mach-sandbox/include/mach/linux.h
+++ b/arch/sandbox/mach-sandbox/include/mach/linux.h
@@ -10,6 +10,8 @@ ssize_t linux_write(int fd, const void *buf, size_t count);
 off_t linux_lseek(int fildes, off_t offset);
 int linux_tstc(int fd);
 
+int linux_execve(const char * filename, char *const argv[], char *const envp[]);
+
 int barebox_register_console(char *name_template, int stdinfd, int stdoutfd);
 
 struct linux_console_data {
diff --git a/arch/sandbox/os/common.c b/arch/sandbox/os/common.c
index 9258c66156..92b7dbb2c7 100644
--- a/arch/sandbox/os/common.c
+++ b/arch/sandbox/os/common.c
@@ -45,6 +45,7 @@
 #include <errno.h>
 #include <signal.h>
 #include <sys/select.h>
+#include <sys/wait.h>
 /*
  * ...except the ones needed to connect with barebox
  */
@@ -185,6 +186,27 @@ off_t linux_lseek(int fd, off_t offset)
 	return lseek(fd, offset, SEEK_SET);
 }
 
+int linux_execve(const char * filename, char *const argv[], char *const envp[])
+{
+	pid_t pid, tpid;
+	int execve_status;
+
+	pid = fork();
+
+	if (pid == -1) {
+		perror("linux_execve");
+		return pid;
+	} else if (pid == 0) {
+		exit(execve(filename, argv, envp));
+	} else {
+		do {
+			tpid = wait(&execve_status);
+		} while(tpid != pid);
+
+		return execve_status;
+	}
+}
+
 extern void start_barebox(void);
 extern void mem_malloc_init(void *start, void *end);
 
diff --git a/commands/Kconfig b/commands/Kconfig
index 2badea3b7b..ebc9c7f2d0 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -107,6 +107,12 @@ config CMD_TIME
 	  checking for ctrl-c, so the time command can be used with commands
 	  which are interruptible with ctrl-c.
 
+config CMD_LINUX_EXEC
+	bool "linux exec"
+	depends on LINUX
+	help
+	  This command executes a command on the Linux host.
+
 endmenu
 
 menu "file commands                 "
diff --git a/commands/Makefile b/commands/Makefile
index e95fdc375d..aa013de107 100644
--- a/commands/Makefile
+++ b/commands/Makefile
@@ -61,3 +61,4 @@ obj-$(CONFIG_CMD_TIME)		+= time.o
 obj-$(CONFIG_CMD_OFTREE)	+= oftree.o
 obj-$(CONFIG_CMD_MAGICVAR)	+= magicvar.o
 obj-$(CONFIG_CMD_IOMEM)		+= iomem.o
+obj-$(CONFIG_CMD_LINUX_EXEC)	+= linux_exec.o
-- 
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