daemon error handling: Define a new function reply_with_perror_errno.

[libguestfs.git] / daemon / daemon.h

diff --git a/daemon/daemon.h b/daemon/daemon.h
index 8912840..88d0306 100644 (file)
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -19,6 +19,7 @@
 #ifndef GUESTFSD_DAEMON_H
 #define GUESTFSD_DAEMON_H
 
+#include <stdio.h>
 #include <stdarg.h>
 #include <errno.h>
 #include <unistd.h>
@@ -101,14 +102,26 @@ extern guestfs_int_lvm_pv_list *parse_command_line_pvs (void);
 extern guestfs_int_lvm_vg_list *parse_command_line_vgs (void);
 extern guestfs_int_lvm_lv_list *parse_command_line_lvs (void);
 
+/*-- in optgroups.c (auto-generated) --*/
+struct optgroup {
+  const char *group;            /* Name of the optional group. */
+  int (*available) (void);      /* Function to test availability. */
+};
+extern struct optgroup optgroups[];
+
+/*-- in sync.c --*/
+/* Use this as a replacement for sync(2). */
+extern int sync_disks (void);
+
 /*-- in proto.c --*/
 extern void main_loop (int sock) __attribute__((noreturn));
 
 /* ordinary daemon functions use these to indicate errors */
 extern void reply_with_error (const char *fs, ...)
   __attribute__((format (printf,1,2)));
-extern void reply_with_perror (const char *fs, ...)
-  __attribute__((format (printf,1,2)));
+extern void reply_with_perror_errno (int err, const char *fs, ...)
+  __attribute__((format (printf,2,3)));
+#define reply_with_perror(...) reply_with_perror_errno(errno, __VA_ARGS__)
 
 /* daemon functions that receive files (FileIn) should call
  * receive_file for each FileIn parameter.
@@ -118,7 +131,7 @@ extern int receive_file (receive_cb cb, void *opaque);
 
 /* daemon functions that receive files (FileIn) can call this
  * to cancel incoming transfers (eg. if there is a local error),
- * but they MUST then call reply_with_error or reply_with_perror.
+ * but they MUST then call reply_with_*.
  */
 extern void cancel_receive (void);
 
@@ -164,7 +177,7 @@ extern void reply (xdrproc_t xdrp, char *ret);
  */
 #define RESOLVE_DEVICE(path,fail_stmt)                                 \
   do {                                                                 \
-    if (strncmp ((path), "/dev/", 5) != 0) {                           \
+    if (STRNEQLEN ((path), "/dev/", 5)) {                              \
       reply_with_error ("%s: %s: expecting a device name", __func__, (path)); \
       fail_stmt;                                                       \
     }                                                                  \
@@ -184,7 +197,7 @@ extern void reply (xdrproc_t xdrp, char *ret);
  */
 #define REQUIRE_ROOT_OR_RESOLVE_DEVICE(path,fail_stmt)                 \
   do {                                                                 \
-    if (strncmp ((path), "/dev/", 5) == 0)                             \
+    if (STREQLEN ((path), "/dev/", 5))                                  \
       RESOLVE_DEVICE ((path), fail_stmt);                              \
     else {                                                             \
       NEED_ROOT (fail_stmt);                                           \
@@ -224,6 +237,16 @@ extern void reply (xdrproc_t xdrp, char *ret);
   }                                                                    \
   while (0)
 
+/* Marks functions which are not available.
+ * NB. Cannot be used for FileIn functions.
+ */
+#define NOT_AVAILABLE(errcode)                                          \
+  do {                                                                 \
+    reply_with_error ("%s: function not available", __func__);          \
+    return (errcode);                                                  \
+  }                                                                    \
+  while (0)
+
 #ifndef __attribute__
 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8)
 #  define __attribute__(x) /* empty */
@@ -234,4 +257,14 @@ extern void reply (xdrproc_t xdrp, char *ret);
 # define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
 #endif
 
+#define STREQ(a,b) (strcmp((a),(b)) == 0)
+#define STRCASEEQ(a,b) (strcasecmp((a),(b)) == 0)
+#define STRNEQ(a,b) (strcmp((a),(b)) != 0)
+#define STRCASENEQ(a,b) (strcasecmp((a),(b)) != 0)
+#define STREQLEN(a,b,n) (strncmp((a),(b),(n)) == 0)
+#define STRCASEEQLEN(a,b,n) (strncasecmp((a),(b),(n)) == 0)
+#define STRNEQLEN(a,b,n) (strncmp((a),(b),(n)) != 0)
+#define STRCASENEQLEN(a,b,n) (strncasecmp((a),(b),(n)) != 0)
+#define STRPREFIX(a,b) (strncmp((a),(b),strlen((b))) == 0)
+
 #endif /* GUESTFSD_DAEMON_H */