X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=fd.c;h=30623d1b321b8dfed84b07c33034fc20e05dd351;hp=df7921b4f393c4b4c2bcfc963c757c0a67aec661;hb=25e6054e929908d9e21a2dd39996117e93124da5;hpb=02d14b8dab5d70d73402fb12a6bd642f70287b52

diff --git a/fd.c b/fd.c
index df7921b4..30623d1b 100644
--- a/fd.c
+++ b/fd.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2006-2007 Andre Noll <maan@systemlinux.org>
  *
  *     This program is free software; you can redistribute it and/or modify
  *     it under the terms of the GNU General Public License as published by
@@ -19,7 +19,7 @@
 /** \file fd.c helper functions for file descriptor handling */
 
 #include "para.h"
-
+#include <sys/mman.h>
 #include <fcntl.h>
 #include <sys/select.h>
 
@@ -167,8 +167,42 @@ again:
 	goto again;
 }
 
+/**
+ * paralash's wrapper for fseek(3)
+ *
+ * \param stream stream to seek
+ * \param offset added to the position specified by whence
+ * \param whence \p SEEK_SET, \p SEEK_CUR, or \p SEEK_END
+ *
+ * \return positive on success, -E_FSEEK on errors.
+ *
+ * \sa fseek(3)
+ */
 int para_fseek(FILE *stream, long offset, int whence)
 {
 	int ret = fseek(stream, offset, whence);
-	return ret < 0? -E_FSEEK : ret;
+	return ret < 0? -E_FSEEK : 1;
+}
+
+/**
+ * *paraslash's wrapper for mmap
+ *
+ * \param length number of bytes to mmap
+ * \param prot either PROT_NONE or the bitwise OR of one or more of
+ * PROT_EXEC PROT_READ PROT_WRITE
+ * \param flags exactly one of MAP_SHARED and MAP_PRIVATE
+ * \param fd the file to mmap from
+ * \param offset mmap start
+ *
+ * \return This function either returns a valid pointer to the mapped area
+ * or calls exit() on errors.
+ */
+void *para_mmap(size_t length, int prot, int flags, int fd, off_t offset)
+{
+	void *ret = mmap(NULL, length, prot, flags, fd, offset);
+	if (ret != MAP_FAILED)
+		return ret;
+	PARA_EMERG_LOG("mmap failed: %s", strerror(errno));
+	exit(EXIT_FAILURE);
 }
+