X-Git-Url: https://git.xandkar.net/?a=blobdiff_plain;f=x5%2Fkhatus_sensor_time.c;h=869134c01f4bd0e39a7dd04d0608c1ab56b4030d;hb=0a01172a1b089cda1c526d7182ea0ce7e249b27f;hp=f156f455d40ab4db874c3a5100418f3434ece3d2;hpb=8345f2b388e0986829ceeae50ecf186d5d540a9c;p=khatus.git

diff --git a/x5/khatus_sensor_time.c b/x5/khatus_sensor_time.c
index f156f45..869134c 100644
--- a/x5/khatus_sensor_time.c
+++ b/x5/khatus_sensor_time.c
@@ -1,5 +1,8 @@
+#include <assert.h>
+#include <ctype.h>
 #include <errno.h>
-#include <stdarg.h>
+#include <fcntl.h>
+#include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -9,35 +12,35 @@
 #include "khatus_lib_log.h"
 #include "khatus_lib_time.h"
 
-char *argv0;
+#define usage(...) {print_usage(); fprintf(stderr, "Error:\n    " __VA_ARGS__); exit(EXIT_FAILURE);}
+
+#define MAX_LEN 20
+#define END_OF_MESSAGE '\n'
+
+char *argv0 = NULL;
+
+double opt_interval = 1.0;
+char *opt_fmt = "%a %b %d %H:%M:%S";
+char *fifo_name = NULL;
 
 void
-usage()
+print_usage()
 {
 	printf(
-	    "%s: [OPT ...]\n"
+	    "%s: [OPT ...] FIFO\n"
 	    "\n"
+	    "FIFO = string    # path to fifo file\n"
 	    "OPT = -i int     # interval\n"
 	    "    | -f string  # format string\n"
 	    "    | -h         # help message (i.e. what you're reading now :) )\n",
 	    argv0);
-	fatal("usage\n");
 }
 
-int
-main(int argc, char **argv)
+void
+opt_parse(int argc, char **argv)
 {
-	argv0 = argv[0];
-
-	double opt_interval = 1.0;
-	char *opt_fmt = "%a %b %d %H:%M:%S";
-
-	time_t t;
-	struct timespec ti;
-	char buf[128];
 	char c;
 
-	memset(buf, '\0', 128);
 	while ((c = getopt(argc, argv, "f:i:h")) != -1)
 		switch (c) {
 		case 'f':
@@ -48,17 +51,86 @@ main(int argc, char **argv)
 			opt_interval = atof(optarg);
 			break;
 		case 'h':
-			usage();
-			break;
+			print_usage();
+			exit(EXIT_SUCCESS);
+		case '?':
+			if (optopt == 'f' || optopt == 'i')
+				fprintf(stderr,
+					"Option -%c requires an argument.\n",
+					optopt);
+			else if (isprint(optopt))
+				fprintf (stderr,
+					"Unknown option `-%c'.\n",
+					optopt);
+			else
+				fprintf(stderr,
+					"Unknown option character `\\x%x'.\n",
+					optopt);
+			exit(EXIT_FAILURE);
 		default:
-			usage();
+			assert(0);
 		}
+	fifo_name = argv[optind];
+	debug("fifo_name: %s\n", fifo_name);
+	if (!fifo_name)
+		usage("No filename was provided\n");
+}
+
+int
+main(int argc, char **argv)
+{
+	argv0 = argv[0];
+
+	time_t t;
+	struct timespec ti;
+	char buf[MAX_LEN];
+
+	int fd = -1;
+
+	int n = 0;  /* written */
+	int r = 0;  /* remaining */
+	int i = 0;  /* buffer position */
+
+	opt_parse(argc, argv);
+
+	signal(SIGPIPE, SIG_IGN);  /* Handling manually */
+
+	memset(buf, '\0', MAX_LEN);
 	ti = timespec_of_float(opt_interval);
 	for (;;) {
+		debug("openning \"%s\"\n", fifo_name);
+		fd = open(fifo_name, O_WRONLY);
+		if (fd < 0)
+			fatal("Failed to open FIFO file: \"%s\". Error: %s\n",
+			    fifo_name,
+			    strerror(errno));
+		debug("openned. fd: %d\n", fd);
 		t = time(NULL);
-		strftime(buf, sizeof(buf), opt_fmt, localtime(&t));
-		puts(buf);
-		fflush(stdout);
+		strftime(buf, MAX_LEN, opt_fmt, localtime(&t));
+		r = strlen(buf);
+		buf[r] = END_OF_MESSAGE;
+		for (i = 0; (n = write(fd, buf + i++, 1)) && r; r--)
+			;
+		if (n < 0)
+			switch (errno) {
+			case EPIPE:
+				error("Broken pipe. Msg buf: %s\n", buf);
+				break;
+			default:
+				fatal(
+				    "Failed to write to %s. "
+				    "Err num: %d, Err msg: %s\n",
+				    fifo_name,
+				    errno,
+				    strerror(errno));
+			}
+		if (close(fd) < 0)
+			fatal("Failed to close %s. Err num: %d, Err msg: %s\n",
+			    fifo_name,
+			    errno,
+			    strerror(errno));
+		fd = -1;
+		debug("closed. fd: %d\n", fd);
 		snooze(&ti);
 	}
 	return EXIT_SUCCESS;