From 93c22493e847fa074d62fd7d8f7d618a19690db0 Mon Sep 17 00:00:00 2001
From: Mattias Andrée <maandree@kth.se>
Date: Mon, 11 Jul 2016 16:29:27 +0200
Subject: Create and listen to socket + do not use deprecated usleep
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Signed-off-by: Mattias Andrée <maandree@kth.se>
---
 src/gammad.c | 40 ++++++++++++++++++++++++++++++++++++----
 src/util.c   | 19 +++++++++++++++++++
 src/util.h   | 11 +++++++++++
 3 files changed, 66 insertions(+), 4 deletions(-)

(limited to 'src')

diff --git a/src/gammad.c b/src/gammad.c
index 6fb2076..9534f9f 100644
--- a/src/gammad.c
+++ b/src/gammad.c
@@ -17,15 +17,17 @@
  */
 #include <libgamma.h>
 
+#include <sys/socket.h>
 #include <sys/stat.h>
+#include <sys/un.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <pwd.h>
-#include <stdlib.h>
+#include <signal.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
-#include <signal.h>
 
 #include "arg.h"
 #include "output.h"
@@ -48,6 +50,11 @@ struct output* outputs = NULL;
  */
 size_t outputs_n = 0;
 
+/**
+ * The server socket's file descriptor
+ */
+int socketfd = -1;
+
 
 
 /**
@@ -239,7 +246,7 @@ static int is_pidfile_reusable(const char* pidfile, const char* token)
     {
       if (++tries > 1)
 	goto bad;
-      usleep(100000); /* 1 tenth of a second */ /* TODO replace with nanosleep */
+      msleep(100); /* 1 tenth of a second */
       goto retry;
     }
   
@@ -588,7 +595,26 @@ int main(int argc, char** argv)
 	  goto fail;
       }
   
-  /* TODO socket */
+  /* Create socket and start listening */
+  {
+    struct sockaddr_un address;
+    address.sun_family = AF_UNIX;
+    if (strlen(socketpath) >= sizeof(address.sun_path))
+      {
+	errno = ENAMETOOLONG;
+	goto fail;
+      }
+    strcpy(address.sun_path, socketpath);
+    unlink(socketpath);
+    if ((socketfd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
+      goto fail;
+    if (fchmod(socketfd, S_IRWXU) < 0)
+      goto fail;
+    if (bind(socketfd, (struct sockaddr*)(&address), sizeof(address)) < 0)
+      goto fail;
+    if (listen(socketfd, SOMAXCONN) < 0)
+      goto fail;
+  }
   
   /* Change directory to / to avoid blocking umounting. */
   if (chdir("/") < 0)
@@ -689,6 +715,12 @@ int main(int argc, char** argv)
   /* Done */
   rc = 0;
  done:
+  if (socketfd >= 0)
+    {
+      shutdown(socketfd, SHUT_RDWR);
+      close(socketfd);
+      unlink(socketpath);
+    }
 #define RESTORE_RAMPS(SUFFIX, MEMBER) \
   do \
     if (outputs[i].saved_ramps.MEMBER.red != NULL) \
diff --git a/src/util.c b/src/util.c
index 715aa6b..81926c6 100644
--- a/src/util.c
+++ b/src/util.c
@@ -21,6 +21,7 @@
 #include <errno.h>
 #include <stdlib.h>
 #include <string.h>
+#include <time.h>
 #include <unistd.h>
 
 
@@ -133,3 +134,21 @@ int dup2atleast(int fd, int atleast)
   return new;
 }
 
+
+/**
+ * Perform a timed suspention of the process.
+ * The process resumes when the timer expires,
+ * or when it is interrupted.
+ * 
+ * @param  ms  The number of milliseconds to sleep,
+ *             must be less than 1000
+ */
+void msleep(int ms)
+{
+  struct timespec ts;
+  ts.tv_sec = 0;
+  ts.tv_nsec = (long)ms * 1000000L;
+  if (clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, NULL) == ENOTSUP)
+    nanosleep(&ts, NULL);
+}
+
diff --git a/src/util.h b/src/util.h
index 25c1a71..5941e50 100644
--- a/src/util.h
+++ b/src/util.h
@@ -52,3 +52,14 @@ void* nread(int fd, size_t* n);
  */
 int dup2atleast(int fd, int atleast);
 
+
+/**
+ * Perform a timed suspention of the process.
+ * The process resumes when the timer expires,
+ * or when it is interrupted.
+ * 
+ * @param  ms  The number of milliseconds to sleep,
+ *             must be less than 1000
+ */
+void msleep(int ms);
+
-- 
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