1 files changed, 114 insertions, 0 deletions
diff --git a/libetpan/src/data-types/mailsem.c b/libetpan/src/data-types/mailsem.c
new file mode 100644
index 0000000..383d953
--- a/dev/null
+++ b/libetpan/src/data-types/mailsem.c
@@ -0,0 +1,114 @@
+/*
+ * libEtPan! -- a mail stuff library
+ *
+ * Copyright (C) 2001, 2005 - DINH Viet Hoa
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the libEtPan! project nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * $Id$
+ */
+
+#include "mailsem.h"
+#include <semaphore.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+
+enum {
+  SEMKIND_SEMOPEN,
+  SEMKIND_SEMINIT,
+};
+
+#define SEMNAME_LEN 64
+
+struct mailsem * mailsem_new(void)
+{
+  struct mailsem * sem;
+  int r;
+  
+  sem = malloc(sizeof(* sem));
+  if (sem == NULL)
+    goto err;
+  
+  r = sem_init(sem->sem_sem, 0, 0);
+  if (r < 0) {
+    char name[SEMNAME_LEN];
+    
+    free(sem->sem_sem);
+    
+    snprintf(name, sizeof(name), "sem-%p", sem);
+    
+#ifndef __CYGWIN__
+    sem->sem_sem = sem_open(name, O_CREAT, 0600, 0);
+    if (sem->sem_sem == NULL)
+      goto err;
+    
+    sem->sem_kind = SEMKIND_SEMOPEN;
+#else
+    goto err;
+#endif
+  }
+  else {
+    sem->sem_kind = SEMKIND_SEMINIT;
+  }
+  
+  return sem;
+  
+ err:
+  return NULL;
+}
+
+void mailsem_free(struct mailsem * sem)
+{
+  if (sem->sem_kind == SEMKIND_SEMOPEN) {
+    char name[SEMNAME_LEN];
+    
+#ifndef __CYGWIN__
+    sem_close((sem_t *) sem->sem_sem);
+    snprintf(name, sizeof(name), "sem-%p", sem);
+    sem_unlink(name);
+#endif
+  }
+  else {
+    sem_destroy((sem_t *) sem->sem_sem);
+    free(sem->sem_sem);
+  }
+  free(sem);
+}
+
+int mailsem_up(struct mailsem * sem)
+{
+  return sem_wait((sem_t *) sem->sem_sem);
+}
+
+int mailsem_down(struct mailsem * sem)
+{
+  return sem_post((sem_t *) sem->sem_sem);
+}