Mon 14 Oct 23:09:15 CEST 2024

user/test/write.c

@@ -0,0 +1,51 @@
+/*
+Copyright (C) 2016-2019 The University of Notre Dame
+This software is distributed under the GNU General Public License.
+See the file LICENSE for details.
+*/
+
+/*
+A trivial user level program to try out basic system calls.
+*/
+
+#include "library/syscalls.h"
+#include "library/string.h"
+#include "library/user-io.h"
+
+int main(int argc, char *argv[])
+{
+	uint32_t j = 0;
+	syscall_chdir("/");
+	printf("got root\n");
+	int fd = syscall_open_file("kevin", 2, 0);
+	printf("got fd %d\n", fd);
+	printf("writing to file...\n");
+	for(;;) {
+		j++;
+		char buffer[100] = "Hello, world! I can write to ";
+		char num[5];
+		char newline[2] = "\n";
+		int n;
+		uint_to_string(j, num);
+		strcat(buffer, num);
+		strcat(buffer, newline);
+		n = syscall_object_write(fd, buffer, strlen(buffer));
+		if(n < 0)
+			break;
+		printf("wrote %d chars: %s\n", n, buffer);
+	}
+	syscall_object_close(fd);
+	fd = syscall_open_file("kevin", 1, 0);
+	char buffer[1000];
+	int n;
+	printf("reading file...\n");
+	while((n = syscall_object_read(fd, buffer, 999)) > 0) {
+		buffer[n] = 0;
+		printf("%s");
+		flush();
+	}
+	syscall_object_close(fd);
+	syscall_process_exit(0);
+
+	return 0;
+}