Added execv() and system().

src/include/gpxe/command.h

@@ -0,0 +1,22 @@
+#ifndef _GPXE_COMMAND_H
+#define _GPXE_COMMAND_H
+
+#include <gpxe/tables.h>
+
+/** A command-line command */
+struct command {
+	/** Name of the command */
+	const char *name;
+	/**
+	 * Function implementing the command
+	 *
+	 * @v argc		Argument count
+	 * @v argv		Argument list
+	 * @ret rc		Return status code
+	 */
+	int ( * exec ) ( int argc, char **argv );
+};
+
+#define __command __table ( commands, 01 )
+
+#endif /* _GPXE_COMMAND_H */

src/include/stdlib.h

@@ -5,6 +5,7 @@ extern unsigned long strtoul ( const char *p, char **endp, int base );
 extern void * realloc ( void *old_ptr, size_t new_size );
 extern void * malloc ( size_t size );
 extern void free ( void *ptr );
+extern int system ( const char *command );
 
 /**
  * Allocate cleared memory

src/include/unistd.h

@@ -0,0 +1,24 @@
+#ifndef _UNISTD_H
+#define _UNISTD_H
+
+#include <stddef.h>
+#include <stdarg.h>
+
+extern int execv ( const char *command, char * const argv[] );
+
+/**
+ * Execute command
+ *
+ * @v command		Command name
+ * @v arg ...		Argument list (starting with argv[0])
+ * @ret rc		Command exit status
+ *
+ * This is a front end to execv().
+ */
+#define execl( command, arg, ... ) ( {					\
+		char * const argv[] = { (arg), ## __VA_ARGS__, NULL };	\
+		int rc = execv ( (command), argv );			\
+		rc;							\
+	} )
+
+#endif /* _UNISTD_H */