1 files changed, 85 insertions, 0 deletions
diff --git a/src/libpcp/src/p_lrequest.c b/src/libpcp/src/p_lrequest.c
new file mode 100644
index 0000000..bbe9696
--- /dev/null
+++ b/src/libpcp/src/p_lrequest.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2012-2013 Red Hat.
+ * Copyright (c) 2000,2004 Silicon Graphics, Inc.  All Rights Reserved.
+ * 
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ * 
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+ * License for more details.
+ *
+ * Thread-safe note
+ *
+ * Unlike most of the other __pmSend*() routines, there is no wrapper
+ * routine in libpcp for __pmSendLogRequest() so there is no place in
+ * the library to enforce serialization between the sending of the
+ * PDU in __pmSendLogRequest() and reading the result PDU.
+ *
+ * It is assumed that the caller of __pmSendLogRequest() either manages
+ * this serialization or is single-threaded, which is true for
+ * the only current user of this routine, pmlc(1).
+ */
+
+#include <ctype.h>
+#include "pmapi.h"
+#include "impl.h"
+
+/*
+ * PDU for general pmlogger notification (PDU_LOG_REQUEST)
+ */
+typedef struct {
+    __pmPDUHdr	hdr;
+    int		type;		/* notification type */
+} notify_t;
+
+int
+__pmSendLogRequest(int fd, int type)
+{
+    notify_t	*pp;
+    int		sts;
+
+    if ((pp = (notify_t *)__pmFindPDUBuf(sizeof(notify_t))) == NULL)
+	return -oserror();
+    pp->hdr.len = sizeof(notify_t);
+    pp->hdr.type = PDU_LOG_REQUEST;
+    pp->hdr.from = FROM_ANON;		/* context does not matter here */
+    pp->type = htonl(type);
+#ifdef PCP_DEBUG
+    if (pmDebug & DBG_TRACE_PDU) {
+	int version = __pmVersionIPC(fd);
+	fprintf(stderr, "_pmSendRequest: sending PDU (type=%d, version=%d)\n",
+		pp->type, version==UNKNOWN_VERSION? LOG_PDU_VERSION : version);
+    }
+#endif
+
+    sts = __pmXmitPDU(fd, (__pmPDU *)pp);
+    __pmUnpinPDUBuf(pp);
+    return sts;
+}
+
+int
+__pmDecodeLogRequest(const __pmPDU *pdubuf, int *type)
+{
+    const notify_t	*pp;
+    const char		*pduend;
+
+    pp = (const notify_t *)pdubuf;
+    pduend = (const char *)pdubuf + pp->hdr.len;
+
+    if (pduend - (char*)pp < sizeof(notify_t))
+	return PM_ERR_IPC;
+
+    *type = ntohl(pp->type);
+#ifdef PCP_DEBUG
+    if (pmDebug & DBG_TRACE_PDU) {
+	int version = __pmLastVersionIPC();
+	fprintf(stderr, "__pmDecodeLogRequest: got PDU (type=%d, version=%d)\n",
+		*type, version==UNKNOWN_VERSION? LOG_PDU_VERSION : version);
+    }
+#endif
+    return 0;
+}