The user tramps for socket system calls and a test program.

6d6e0727 · Silas Boyd-Wickizer · aab8fae3 · 6d6e0727 · 6d6e0727 · 6d6e0727
--- a/net.mk
+++ b/net.mk
@@ -9,6 +9,8 @@ ifeq ($(HAVE_LWIP),y)
 -include $(O)/net/*.d
 OBJS += $(O)/liblwip.a
+UPROGS += $(O)/_telnetd
 CFLAGS += -Ilwip/src/include -Inet -Ilwip/src/include/ipv4 -I. -DLWIP
 LWIP_CFLAGS = -fno-pic -static -fno-builtin -fno-strict-aliasing -O2 -Wall -MD -ggdb \

--- a/syscall.h
+++ b/syscall.h
@@ -23,3 +23,7 @@
 #define SYS_map    22
 #define SYS_unmap  23
 #define SYS_halt   24
+#define SYS_socket 25
+#define SYS_bind   26
+#define SYS_listen 27
+#define SYS_accept 28
--- a/telnetd.c
+++ b/telnetd.c
+#include "types.h"
+#include "user.h"
+#include "unet.h"
+int
+main(void)
+{
+  int s;
+  int r;
+  s = socket(AF_INET, SOCK_STREAM, 0);
+  if (s < 0)
+    die("telnetd socket: %d\n", s);
+  struct sockaddr_in sin;
+  sin.sin_family = AF_INET;
+  sin.sin_addr.s_addr = htonl(INADDR_ANY);
+  sin.sin_port = htons(23);
+  r = bind(s, (struct sockaddr *)&sin, sizeof(sin));
+  if (r < 0)
+    die("telnetd bind: %d\n", r);
+  r = listen(s, 5);
+  if (r < 0)
+    die("telnetd listen: %d\n", r);
+  for (;;) {
+    socklen_t socklen = sizeof(sin);
+    int ss = accept(s, (struct sockaddr *)&sin, &socklen);
+    if (ss < 0) {
+      printf(1, "telnetd accept: %d\n", ss);
+      continue;
+    }
+    printf(1, "Got one!\n");
+    // XXX fork, exec sh, etc..
+    close(ss);
+  }
+}
--- a/unet.h
+++ b/unet.h
+#ifdef LWIP
+#include "lwip/sockets.h"
+// system calls
+extern int socket(int domain, int type, int protocol);
+extern int bind(int sockfd, const struct sockaddr *addr,
+                socklen_t addrlen);
+extern int listen(int sockfd, int backlog);
+extern int accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen);
+#endif
--- a/usys.S
+++ b/usys.S
@@ -32,3 +32,7 @@ SYSCALL(uptime)
 SYSCALL(map)
 SYSCALL(unmap)
 SYSCALL(halt)
+SYSCALL(socket)
+SYSCALL(bind)
+SYSCALL(listen)
+SYSCALL(accept)