From a114167f3ee6db22217d70a48267871ee08e6c4b Mon Sep 17 00:00:00 2001
From: Tzafrir Cohen <tzafrir.cohen@xorcom.com>
Date: Thu, 13 Aug 2009 15:15:49 +0000
Subject: xpp: Add astribank_is_starting:

astribank_is_running is used to tell when we may have an Astribank that
is initializing (and may be re-enumerating and thus not listed as a
device).

It uses a semaphore as we can always write to one and we can't always
write to a file.


git-svn-id: http://svn.asterisk.org/svn/dahdi/tools/trunk@6987 a0bf4364-ded3-4de4-8d8a-66a801d63aff
---
 xpp/astribank_is_starting.c | 120 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 xpp/astribank_is_starting.c

(limited to 'xpp/astribank_is_starting.c')

diff --git a/xpp/astribank_is_starting.c b/xpp/astribank_is_starting.c
new file mode 100644
index 0000000..3018904
--- /dev/null
+++ b/xpp/astribank_is_starting.c
@@ -0,0 +1,120 @@
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/sem.h>
+#include <errno.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static char		*progname;
+static const key_t	key_astribanks = 0xAB11A0;
+static int		debug;
+
+static void usage(void)
+{
+	fprintf(stderr, "Usage: %s [-d] [-a] [-r]\n", progname);
+	exit(1);
+}
+
+static int absem_get(int createit)
+{
+	int	flags = (createit) ? IPC_CREAT | 0644 : 0;
+	int	absem;
+
+	if((absem = semget(key_astribanks, 1, flags)) < 0)
+		absem = -errno;
+	return absem;
+}
+
+static int absem_touch(void)
+{
+	int		absem;
+
+	if((absem = absem_get(1)) < 0) {
+		perror(__FUNCTION__);
+		return absem;
+	}
+	if(semctl(absem, 0, SETVAL, 0) < 0) {
+		perror("SETVAL");
+		return -errno;
+	}
+	if(debug)
+		fprintf(stderr, "%s: touched absem\n", progname);
+	return 0;
+}
+
+static int absem_remove(void)
+{
+	int	absem;
+
+	if((absem = absem_get(0)) < 0) {
+		if(absem == -ENOENT) {
+			if(debug)
+				fprintf(stderr, "%s: absem already removed\n", progname);
+			return 0;
+		}
+		perror(__FUNCTION__);
+		return absem;
+	}
+	if(semctl(absem, 0, IPC_RMID, 0) < 0) {
+		perror("RMID");
+		return -errno;
+	}
+	if(debug)
+		fprintf(stderr, "%s: removed absem\n", progname);
+	return 0;
+}
+
+static int absem_detected(void)
+{
+	int	absem;
+
+	if((absem = absem_get(0)) < 0) {
+		if(debug)
+			fprintf(stderr, "%s: absem does not exist\n", progname);
+		return absem;
+	}
+	if(debug)
+		fprintf(stderr, "%s: absem exists\n", progname);
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	const char	options[] = "darh";
+	int		val;
+
+	progname = argv[0];
+	while (1) {
+		int	c;
+
+		c = getopt (argc, argv, options);
+		if (c == -1)
+			break;
+
+		switch (c) {
+			case 'd':
+				debug++;
+				break;
+			case 'a':
+				if((val = absem_touch()) < 0) {
+					fprintf(stderr, "%s: Add failed: %d\n", progname, val);
+					return 1;
+				}
+				return 0;
+			case 'r':
+				if((val = absem_remove()) < 0) {
+					fprintf(stderr, "%s: Remove failed: %d\n", progname, val);
+					return 1;
+				}
+				return 0;
+			case 'h':
+			default:
+				fprintf(stderr, "Unknown option '%c'\n", c);
+				usage();
+		}
+	}
+	val = absem_detected();
+	return (val == 0) ? 0 : 1;
+}
-- 
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