ogg_afh.c: add documentation of struct ogg_datasource

[paraslash.git] / fd.c

diff --git a/fd.c b/fd.c
index 36b3769d289a03aa0148aa941a713ba1534a2be0..ec174ff69ed768645bd92705d1384b0cc074ea06 100644 (file)
--- 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>
 
@@ -47,8 +47,8 @@ int file_exists(const char *fn)
  * \param n the highest-numbered descriptor in any of the two sets, plus 1
  * \param readfds fds that should be checked for readability
  * \param writefds fds that should be checked for writablility
- * \param timeout upper bound on the amount of time elapsed before select()
- *  returns
+ * \param timeout_tv upper bound on the amount of time elapsed before select()
+ * returns
  *
  * \return The return value of the underlying select() call.
  *
@@ -119,24 +119,53 @@ void para_fd_set(int fd, fd_set *fds, int *max_fileno)
 }
 
 /**
- * paraslash's wrapper for fread(3)
- *
- * \param dest destination pointer
- * \param nbytes size of one element
- * \param nmemb number of elements to write
- * \param stream the input stream
+* paraslash's wrapper for fgets(3)
+* \param line pointer to the buffer to store the line
+* \param size the size of the buffer given by \a line
+* \param f the stream to read from
+*
+* \return Unlike the standard fgets() function, an integer value
+* is returned. On success, this function returns 1. On errors, -E_FGETS
+* is returned. A zero return value indicates an end of file condition.
+*/
+__must_check int para_fgets(char *line, int size, FILE *f)
+{
+again:
+       if (fgets(line, size, f))
+               return 1;
+       if (feof(f))
+               return 0;
+       if (!ferror(f))
+               return -E_FGETS;
+       if (errno != EINTR) {
+               PARA_ERROR_LOG("%s\n", strerror(errno));
+               return -E_FGETS;
+       }
+       clearerr(f);
+       goto again;
+}
+
+/**
+ * *paraslash's wrapper for mmap
  *
- * \return negative on errors, zero on end of file, and the number of bytes
- * (not elements) read on success.
+ * \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
  *
- * \sa fread(3)
+ * \return This function either returns a valid pointer to the mapped area
+ * or calls exit() on errors.
  */
-__must_check int para_fread(void *dest, size_t nbytes, size_t nmemb, FILE *stream)
+void *para_mmap(size_t length, int prot, int flags, int fd, off_t offset)
 {
-       size_t res = fread(dest, nbytes, nmemb, stream);
-       if (res == nmemb)
-               return nbytes * nmemb;
-       if (feof(stream))
-               return 0;
-       return -E_FREAD;
+       void *ret = mmap(NULL, length, prot, flags, fd, offset);
+       if (ret != MAP_FAILED)
+               return ret;
+       PARA_EMERG_LOG("mmap failed: %s\n", strerror(errno));
+       PARA_EMERG_LOG("length: %zu, flags: %d, fd: %d, offset: %zu\n",
+               length, flags, fd, (size_t)offset);
+       exit(EXIT_FAILURE);
 }
+