1 files changed, 102 insertions, 0 deletions
diff --git a/contrib/sendmail/libsm/shm.c b/contrib/sendmail/libsm/shm.c
new file mode 100644
index 0000000..35ae028
--- /dev/null
+++ b/contrib/sendmail/libsm/shm.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers.
+ *      All rights reserved.
+ *
+ * By using this file, you agree to the terms and conditions set
+ * forth in the LICENSE file which can be found at the top level of
+ * the sendmail distribution.
+ */
+
+#include <sm/gen.h>
+SM_RCSID("@(#)$Id: shm.c,v 1.10 2001/12/14 00:22:58 ca Exp $")
+
+#if SM_CONF_SHM
+# include <stdlib.h>
+# include <unistd.h>
+# include <errno.h>
+# include <sm/shm.h>
+
+/*
+**  SM_SHMSTART -- initialize shared memory segment.
+**
+**	Parameters:
+**		key -- key for shared memory.
+**		size -- size of segment.
+**		shmflag -- initial flags.
+**		shmid -- pointer to return id.
+**		owner -- create segment.
+**
+**	Returns:
+**		pointer to shared memory segment,
+**		NULL on failure.
+**
+**	Side Effects:
+**		attaches shared memory segment.
+*/
+
+void *
+sm_shmstart(key, size, shmflg, shmid, owner)
+	key_t key;
+	int size;
+	int shmflg;
+	int *shmid;
+	bool owner;
+{
+	int save_errno;
+	void *shm = SM_SHM_NULL;
+
+	/* default: user/group accessible */
+	if (shmflg == 0)
+		shmflg = SHM_R|SHM_W|(SHM_R>>3)|(SHM_W>>3);
+	if (owner)
+		shmflg |= IPC_CREAT|IPC_EXCL;
+	*shmid = shmget(key, size, shmflg);
+	if (*shmid < 0)
+		goto error;
+
+	shm = shmat(*shmid, (void *) 0, 0);
+	if (shm == SM_SHM_NULL)
+		goto error;
+
+	return shm;
+
+  error:
+	save_errno = errno;
+	if (shm != SM_SHM_NULL || *shmid >= 0)
+		sm_shmstop(shm, *shmid, owner);
+	*shmid = SM_SHM_NO_ID;
+	errno = save_errno;
+	return (void *) 0;
+}
+
+/*
+**  SM_SHMSTOP -- stop using shared memory segment.
+**
+**	Parameters:
+**		shm -- pointer to shared memory.
+**		shmid -- id.
+**		owner -- delete segment.
+**
+**	Returns:
+**		0 on success.
+**		< 0 on failure.
+**
+**	Side Effects:
+**		detaches (and maybe removes) shared memory segment.
+*/
+
+int
+sm_shmstop(shm, shmid, owner)
+	void *shm;
+	int shmid;
+	bool owner;
+{
+	int r;
+
+	if (shm != SM_SHM_NULL && (r = shmdt(shm)) < 0)
+		return r;
+	if (owner && shmid >= 0 && (r = shmctl(shmid, IPC_RMID, NULL)) < 0)
+		return r;
+	return 0;
+}
+#endif /* SM_CONF_SHM */