Added posix code

conts/posix/test0/src/exectest.c

@@ -0,0 +1,76 @@
+/*
+ * Execve test.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <tests.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+#include <errno.h>
+
+extern char _start_test_exec[];
+extern char _end_test_exec[];
+
+int exectest(void)
+{
+	int fd, err;
+	void *exec_start = (void *)_start_test_exec;
+	unsigned long size = _end_test_exec - _start_test_exec;
+	int left, cnt;
+	char *argv[5];
+	char filename[128];
+
+	memset(filename, 0, 128);
+	sprintf(filename, "/home/bahadir/execfile%d", getpid());
+
+	/* First create a new file and write the executable data to that file */
+	if ((fd = open(filename, O_RDWR | O_CREAT | O_TRUNC, S_IRWXU)) < 0) {
+		err = errno;
+		test_printf("OPEN: %d, for %s\n", errno, filename);
+		/* If it is a minor error like EEXIST, create one with different name */
+		if (errno == EEXIST) {
+			sprintf(filename, "/home/bahadir/execfile%d-2",
+				getpid());
+			if ((fd = open(filename,
+				       O_RDWR | O_CREAT | O_TRUNC, S_IRWXU))
+				       < 0) {
+				printf("OPEN: %d, failed twice, "
+				       "last time for %s\n",
+				       errno, filename);
+				goto out_err;
+			}
+		} else
+			goto out_err;
+	}
+
+	left = size;
+	test_printf("Writing %d bytes to %s\n", left, filename);
+	while (left != 0) {
+		if ((cnt = write(fd, exec_start, left)) < 0)
+			goto out_err;
+		left -= cnt;
+	}
+
+	if ((err = close(fd)) < 0) {
+		goto out_err;
+	}
+
+	/* Set up some arguments */
+	argv[0] = "FIRST ARG";
+	argv[1] = "SECOND ARG";
+	argv[2] = "THIRD ARG";
+	argv[3] = "FOURTH ARG";
+	argv[4] = 0;
+
+	/* Execute the file */
+	err = execve(filename, argv, 0);
+
+out_err:
+	printf("EXECVE failed with %d\n", err);
+	printf("EXECVE TEST      -- FAILED --\n");
+	return 0;
+}
+