Doxygen-ize

server/drivers/lcd_sem.c

@@ -1,3 +1,7 @@
+/** \file server/drivers/lcd_sem.c
+ * semaphore code to mediate access to the parallel port.
+ */
+
 /*
  * lcd_sem.c  -- semaphore code written for lcdtime and meter to mediate
  * access to the parallel port.
@@ -34,7 +38,6 @@
 #include "lcd_sem.h"
 
 // according to X/OPEN we have to define it ourselves
-//#ifdef _SEM_SEMUN_UNDEFINED
 #ifndef HAVE_UNION_SEMUN
 union semun {
 	int val;                    /* value for SETVAL */
@@ -59,19 +62,22 @@ static key_t getkey (register char *p);
 static struct sembuf semaphore_wait = { SEM_WAIT };
 static struct sembuf semaphore_signal = { SEM_SIGNAL };
 
-/*
- * getkey  returns the key for the semaphore
- */
 
+/**
+ * Return the key for the semaphore.
+ */
 static key_t
 getkey(register char *p)
 {
 	return((key_t) SEMKEY);
 }
 
-/*
- * create the semaphore if one doesn't exist and initialise it to 1, else 
- * return the semaphore set id
+
+/**
+ * Get semaphore.
+ * If the semaphore does not exist, create it and initialise it to 1, 
+ * otherwise simply return the semaphore ID.
+ * \return     Semaphore ID on success; terminate program with code \c 1 on error.
  */
 
 int
@@ -113,10 +119,12 @@ sem_get (void)
 	return semid;
 }
 
-/*
- * wait on the semaphore
- */
 
+/**
+ * Wait on the semaphore.
+ * \param sid  Semaphore ID.
+ * \return     \c 0 on success; terminate program with code \c 1 on error.
+ */
 int
 sem_wait(int sid)
 {
@@ -128,10 +136,12 @@ sem_wait (int sid)
 	return 0;
 }
 
-/*
- * signal on the semaphore
- */
 
+/**
+ * Signal on the semaphore.
+ * \param sid  Semaphore ID.
+ * \return     \c 0 on success; terminate program with code \c 1 on error.
+ */
 int
 sem_signal(int sid)
 {
@@ -143,10 +153,12 @@ sem_signal (int sid)
 	return 0;
 }
 
-/*
- * remove the semaphore
- */
 
+/**
+ * Remove the semaphore
+ * \param sid  Semaphore ID.
+ * \return     \c 0 on success; terminate program with code \c 1 on error.
+ */
 int
 sem_remove(int sid)
 {