mangavalk/lcdproc
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More formatting changes, new tags file.

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This commit is contained in:
William Ferrell
2000-04-03 22:13:57 +00:00
parent 0d703c5864
commit 6a115b4446
64 changed files with 8950 additions and 8950 deletions
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server/drivers/lcd_sem.c
+59 -59
View File
@@ -23,7 +23,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h> /* for semaphore functions */
#include <sys/types.h> /* for semaphore functions */
#include <sys/ipc.h>
#include <sys/sem.h>
#include <errno.h>
@@ -32,8 +32,8 @@
#define SEMAPHORE "portctrl"
#define SEMKEY 0x706f7274 /* semaphore key */
#define SEMCOUNT 1 /* number of semaphores to create */
#define WMODE 0660 /* access permissions */
#define SEMCOUNT 1 /* number of semaphores to create */
#define WMODE 0660 /* access permissions */
#define SEM_SIGNAL 0,1,SEM_UNDO
#define SEM_WAIT 0,-1,SEM_UNDO
@@ -54,7 +54,7 @@ static char rcsId[] = "$Id$";
static key_t
getkey (register char *p)
{
return ((key_t) SEMKEY);
return ((key_t) SEMKEY);
}
/*
@@ -65,40 +65,40 @@ getkey (register char *p)
int
sem_get (void)
{
int semid;
union semun semval;
int semid;
union semun semval;
if ((semid = semget (getkey (SEMAPHORE), SEMCOUNT, IPC_CREAT | IPC_EXCL | WMODE)) < 0) {
switch (errno) {
case EEXIST:
/* semaphore set exists, get id and return it */
if ((semid = semget (getkey (SEMAPHORE), SEMCOUNT, IPC_EXCL | WMODE)) < 0) {
perror ("semget");
exit (1);
}
return semid;
break;
case EACCES:
/* don't have permissions for semaphore, need to change key */
perror ("semget, can't get permissions for semaphore");
exit (1);
break;
default:
perror ("semget");
exit (1);
break;
}
} else {
/* initialise semaphore to 1 */
semval.val = 1;
if ((semid = semget (getkey (SEMAPHORE), SEMCOUNT, IPC_CREAT | IPC_EXCL | WMODE)) < 0) {
switch (errno) {
case EEXIST:
/* semaphore set exists, get id and return it */
if ((semid = semget (getkey (SEMAPHORE), SEMCOUNT, IPC_EXCL | WMODE)) < 0) {
perror ("semget");
exit (1);
}
return semid;
break;
case EACCES:
/* don't have permissions for semaphore, need to change key */
perror ("semget, can't get permissions for semaphore");
exit (1);
break;
default:
perror ("semget");
exit (1);
break;
}
} else {
/* initialise semaphore to 1 */
semval.val = 1;
if (semctl (semid, 0, SETVAL, semval) < 0) {
perror ("setval, can't initialise semaphore");
exit (1);
}
}
if (semctl (semid, 0, SETVAL, semval) < 0) {
perror ("setval, can't initialise semaphore");
exit (1);
}
}
return semid;
return semid;
}
/*
@@ -108,12 +108,12 @@ sem_get (void)
int
sem_wait (int sid)
{
if (semop (sid, &semaphore_wait, 1) < -1) {
perror (SEMAPHORE);
exit (1);
}
if (semop (sid, &semaphore_wait, 1) < -1) {
perror (SEMAPHORE);
exit (1);
}
return 0;
return 0;
}
/*
@@ -123,12 +123,12 @@ sem_wait (int sid)
int
sem_signal (int sid)
{
if (semop (sid, &semaphore_signal, 1) < -1) {
perror (SEMAPHORE);
exit (1);
}
if (semop (sid, &semaphore_signal, 1) < -1) {
perror (SEMAPHORE);
exit (1);
}
return 0;
return 0;
}
/*
@@ -138,20 +138,20 @@ sem_signal (int sid)
int
sem_remove (int sid)
{
int i;
union semun dummy;
int i;
union semun dummy;
if ((i = semctl (sid, 0, IPC_RMID, dummy)) < 0) {
switch (i) {
case EIDRM:
/* semaphore removed */
return 0;
break;
default:
perror ("semctl, removing semaphore");
exit (1);
}
}
if ((i = semctl (sid, 0, IPC_RMID, dummy)) < 0) {
switch (i) {
case EIDRM:
/* semaphore removed */
return 0;
break;
default:
perror ("semctl, removing semaphore");
exit (1);
}
}
return 0;
return 0;
}