Build system fixes and documentation

[nbd.git] / cliserv.h

diff --git a/cliserv.h b/cliserv.h
index 6802580..cefdad2 100644 (file)
--- a/cliserv.h
+++ b/cliserv.h
@@ -35,14 +35,20 @@ typedef unsigned long long u64;
 #error I need at least some 64-bit type
 #endif
 
+#ifdef NBD_H_LOCAL
+/* 2.6.18 and above use __be* rather than u* */
 #define __be32 u32
 #define __be64 u64
-
-#ifdef NBD_H_LOCAL
 #include "nbd.h"
 #endif
 #ifdef NBD_H_LINUX
-#include <linux/nbd.h>
+# ifdef HAVE_LINUX_TYPES_H
+#  include <linux/types.h>
+# else
+#  define __be32 u32
+#  define __be64 u64
+# endif
+# include <linux/nbd.h>
 #endif
 
 #if NBD_LFS==1
@@ -55,8 +61,7 @@ u64 cliserv_magic = 0x00420281861253LL;
 
 #define INFO(a) do { } while(0)
 
-void setmysockopt(int sock)
-{
+void setmysockopt(int sock) {
        int size = 1;
 #if 0
        if (setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &size, sizeof(int)) < 0)
@@ -74,8 +79,17 @@ void setmysockopt(int sock)
 #endif
 }
 
-void err(const char *s)
-{
+#ifndef G_GNUC_NORETURN
+#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 4)
+#define G_GNUC_NORETURN __attribute__((__noreturn__))
+#else
+#define G_GNUC_NORETURN
+#endif
+#endif
+
+void err(const char *s) G_GNUC_NORETURN;
+
+void err(const char *s) {
        const int maxlen = 150;
        char s1[maxlen], *s2;
 
@@ -97,14 +111,12 @@ void err(const char *s)
        s1[maxlen-1] = '\0';
 #ifdef ISSERVER
        syslog(LOG_ERR, "%s", s1);
-#else
-       fprintf(stderr, "Error: %s\n", s1);
 #endif
+       fprintf(stderr, "Error: %s\n", s1);
        exit(1);
 }
 
-void logging(void)
-{
+void logging(void) {
 #ifdef ISSERVER
        openlog(MY_NAME, LOG_PID, LOG_DAEMON);
 #endif
@@ -113,13 +125,11 @@ void logging(void)
 }
 
 #ifdef WORDS_BIGENDIAN
-u64 ntohll(u64 a)
-{
+u64 ntohll(u64 a) {
        return a;
 }
 #else
-u64 ntohll(u64 a)
-{
+u64 ntohll(u64 a) {
        u32 lo = a & 0xffffffff;
        u32 hi = a >> 32U;
        lo = ntohl(lo);
@@ -128,3 +138,7 @@ u64 ntohll(u64 a)
 }
 #endif
 #define htonll ntohll
+
+/* Flags used between the client and server */
+#define NBD_FLAG_HAS_FLAGS     (1 << 0)        /* Flags are there */
+#define NBD_FLAG_READ_ONLY     (1 << 1)        /* Device is read-only */