[socket+net-nif] Introduced a couple of common files

Started to move the common stuff, such as common utility functions,
debug and encode / decode of basic types.

OTP-14831

1 files changed, 116 insertions, 0 deletions

diff --git a/erts/emulator/nifs/common/socket_dbg.c b/erts/emulator/nifs/common/socket_dbg.c
new file mode 100644
index 0000000000..dd11fbca9b
--- /dev/null
+++ b/erts/emulator/nifs/common/socket_dbg.c
@@ -0,0 +1,116 @@
+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 2018-2018. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * %CopyrightEnd%
+ *
+ * ----------------------------------------------------------------------
+ *  Purpose : Debug functions for the socket and net NIF(s).
+ * ----------------------------------------------------------------------
+ *
+ */
+
+#include <stdarg.h>
+#include <string.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <time.h>
+
+#include <erl_nif.h>
+#include "socket_dbg.h"
+
+#define TSELF()            enif_thread_self()
+#define TNAME(__T__)       enif_thread_name( __T__ )
+#define TSNAME()           TNAME(TSELF())
+
+static int realtime(struct timespec* tsP);
+static int timespec2str(char *buf, unsigned int len, struct timespec *ts);
+
+
+/*
+ * Print a debug format string *with* both a timestamp and the
+ * the name of the *current* thread.
+ */
+extern
+void esock_dbg_printf( const char* prefix, const char* format, ... )
+{
+  va_list         args;
+  char            f[512 + sizeof(format)]; // This has to suffice...
+  char            stamp[30];
+  struct timespec ts;
+  int             res;
+
+  /*
+   * We should really include self in the printout, so we can se which process
+   * are executing the code. But then I must change the API....
+   * ....something for later.
+   */
+
+  if (!realtime(&ts)) {
+    if (timespec2str(stamp, sizeof(stamp), &ts) != 0) {
+        res = enif_snprintf(f, sizeof(f), "%s [%s] %s", prefix, TSNAME(), format);
+        // res = enif_snprintf(f, sizeof(f), "%s [%s]", prefix, format);
+    } else {
+      res = enif_snprintf(f, sizeof(f), "%s [%s] [%s] %s", prefix, stamp, TSNAME(), format);
+      // res = enif_snprintf(f, sizeof(f), "%s [%s] %s", prefix, stamp, format);
+    }
+
+    if (res > 0) {
+      va_start (args, format);
+      enif_vfprintf (stdout, f, args);
+      va_end (args);
+      fflush(stdout);
+    }
+  }
+
+  return;
+}
+
+
+static
+int realtime(struct timespec* tsP)
+{
+  return clock_gettime(CLOCK_REALTIME, tsP);
+}
+
+
+
+
+/*
+ * Convert a timespec struct into a readable/printable string
+ */
+static
+int timespec2str(char *buf, unsigned int len, struct timespec *ts)
+{
+  int       ret, buflen;
+  struct tm t;
+
+  tzset();
+  if (localtime_r(&(ts->tv_sec), &t) == NULL)
+    return 1;
+
+  ret = strftime(buf, len, "%F %T", &t);
+  if (ret == 0)
+    return 2;
+  len -= ret - 1;
+  buflen = strlen(buf);
+
+  ret = snprintf(&buf[buflen], len, ".%06ld", ts->tv_nsec/1000);
+  if (ret >= len)
+    return 3;
+
+  return 0;
+}