DEBUG add function to set debug fd

DPRINTF was blindly sending all debug output to fd 2 (stderr).
The new function iscsi_set_debug_fd() will set the debug fd.
In general debugging is completely disabled by default.

include/iscsi-private.h

@@ -130,6 +130,7 @@ struct iscsi_context {
 	int no_auto_reconnect;
 	int reconnect_deferred;
 	int debug;
+	int debug_fd;
 	int mallocs;
 	int reallocs;
 	int frees;
@@ -304,7 +305,7 @@ struct scsi_task *iscsi_scsi_get_task_from_pdu(struct iscsi_pdu *pdu);
 
 void iscsi_set_noautoreconnect(struct iscsi_context *iscsi, int state);
 
-void iscsi_decrement_iface_rr();
+void iscsi_decrement_iface_rr(void);
 
 #ifdef __cplusplus
 }

include/iscsi.h

@@ -971,12 +971,12 @@ iscsi_scsi_cancel_all_tasks(struct iscsi_context *iscsi);
 #define DPRINTF(iscsi,level,fmt,args...) \
 	do { \
 		if ((iscsi)->debug >= level) { \
-			fprintf(stderr,"libiscsi: "); \
+			dprintf((iscsi)->debug_fd,"libiscsi: "); \
-			fprintf(stderr, (fmt), ##args); \
+			dprintf((iscsi)->debug_fd, (fmt), ##args); \
 			if (iscsi->target_name[0]) { \
-				fprintf(stderr," [%s]",iscsi->target_name); \
+				dprintf((iscsi)->debug_fd," [%s]",iscsi->target_name); \
 			} \
-			fprintf(stderr,"\n"); \
+			dprintf((iscsi)->debug_fd,"\n"); \
 		} \
 	} while (0);
 
@@ -993,6 +993,12 @@ iscsi_scsi_cancel_all_tasks(struct iscsi_context *iscsi);
 EXTERN void
 iscsi_set_debug(struct iscsi_context *iscsi, int level);
 
+/*
+ * This function is to set fd where debugging info is sent to. default is stderr (2)
+ */
+EXTERN void
+iscsi_set_debug_fd(struct iscsi_context *iscsi, int fd);
+
 /*
  * This function is to set the TCP_USER_TIMEOUT option. It has to be called after iscsi
  * context creation. The value given in ms is then applied each time a new socket is created.

lib/init.c

@@ -87,6 +87,7 @@ iscsi_create_context(const char *initiator_name)
 	strncpy(iscsi->initiator_name,initiator_name,MAX_STRING_SIZE);
 
 	iscsi->fd = -1;
+	iscsi->debug_fd = 2;
 
 	srand(time(NULL) ^ getpid() ^ (u_int32_t) iscsi);
 
@@ -112,6 +113,10 @@ iscsi_create_context(const char *initiator_name)
 	iscsi->tcp_keepintvl=30;
 	iscsi->tcp_keepidle=30;
 
+	if (getenv("LIBISCSI_DEBUG_FD") != NULL) {
+		iscsi_set_debug_fd(iscsi,atoi(getenv("LIBISCSI_DEBUG_FD")));
+	}
+
 	if (getenv("LIBISCSI_DEBUG") != NULL) {
 		iscsi_set_debug(iscsi,atoi(getenv("LIBISCSI_DEBUG")));
 	}
@@ -315,6 +320,13 @@ iscsi_set_debug(struct iscsi_context *iscsi, int level)
 	DPRINTF(iscsi,2,"set debug level to %d",level);
 }
 
+void
+iscsi_set_debug_fd(struct iscsi_context *iscsi, int fd)
+{
+	iscsi->debug_fd = fd;
+	DPRINTF(iscsi,2,"set debug fd to %d",fd);
+}
+
 const char *
 iscsi_get_error(struct iscsi_context *iscsi)
 {

lib/libiscsi.def

@@ -65,6 +65,7 @@ iscsi_scsi_task_cancel
 iscsi_service
 iscsi_set_alias
 iscsi_set_debug
+iscsi_set_debug_fd
 iscsi_set_header_digest
 iscsi_set_initiator_username_pwd
 iscsi_set_isid_en

lib/libiscsi.syms

@@ -63,6 +63,7 @@ iscsi_scsi_task_cancel
 iscsi_service
 iscsi_set_alias
 iscsi_set_debug
+iscsi_set_debug_fd
 iscsi_set_header_digest
 iscsi_set_initiator_username_pwd
 iscsi_set_isid_en