/*
- * 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
/** \file fd.c helper functions for file descriptor handling */
#include "para.h"
-
+#include <sys/mman.h>
#include <fcntl.h>
#include <sys/select.h>
* \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.
*
* \sa select(2) select_tut(2)
*/
int para_select(int n, fd_set *readfds, fd_set *writefds,
- struct timeval *timeout)
+ struct timeval *timeout_tv)
{
int ret, err;
do {
- ret = select(n, readfds, writefds, NULL, timeout);
+ ret = select(n, readfds, writefds, NULL, timeout_tv);
err = errno;
} while (ret < 0 && err == EINTR);
if (ret < 0)
*/
void para_fd_set(int fd, fd_set *fds, int *max_fileno)
{
+
if (fd < 0 || fd >= FD_SETSIZE) {
PARA_EMERG_LOG("fatal: tried to add invalid fd %d\n", fd);
exit(EXIT_FAILURE);
}
+#if 0
+ {
+ int flags = fcntl(fd, F_GETFL);
+ if (!(flags & O_NONBLOCK)) {
+ PARA_EMERG_LOG("fd %d is a blocking file descriptor\n", fd);
+ exit(EXIT_FAILURE);
+ }
+ }
+#endif
FD_SET(fd, fds);
*max_fileno = PARA_MAX(*max_fileno, fd);
}
/**
- * 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);
}
+