vss: Add documentation of MAP_POPULATE.

[paraslash.git] / fd.c

diff --git a/fd.c b/fd.c
index 49736448a7fe3013a69596525ea4d815358bd226..33891d2e6c9f1c3568428b1df93b4b92e295ef61 100644 (file)
--- a/fd.c
+++ b/fd.c
@@ -1,8 +1,4 @@
-/*
- * Copyright (C) 2006 Andre Noll <maan@tuebingen.mpg.de>
- *
- * Licensed under the GPL v2. For licencing details see COPYING.
- */
+/* Copyright (C) 2006 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
 
 /** \file fd.c Helper functions for file descriptor handling. */
 
@@ -183,15 +179,15 @@ __printf_2_3 int write_va_buffer(int fd, const char *fmt, ...)
  * \param rfds An optional fd set pointer.
  * \param num_bytes Result pointer. Contains the number of bytes read from \a fd.
  *
- * If \a rfds is not \p NULL and the (non-blocking) file descriptor \a fd is
- * not set in \a rfds, this function returns early without doing anything.
- * Otherwise The function tries to read up to \a sz bytes from \a fd, where \a
- * sz is the sum of the lengths of all vectors in \a iov. As for xwrite(),
- * \p EAGAIN is not considered an error condition. However, \p EOF is.
+ * If rfds is not NULL and the (non-blocking) file descriptor fd is not set in
+ * rfds, this function returns early without doing anything. Otherwise it tries
+ * to read up to sz bytes from fd, where sz is the sum of the lengths of all
+ * vectors in iov. Like \ref xwrite(), EAGAIN and EINTR are not considered
+ * error conditions. However, EOF is.
  *
  * \return Zero or a negative error code. If the underlying call to readv(2)
  * returned zero (indicating an end of file condition) or failed for some
- * reason other than \p EAGAIN, a negative error code is returned.
+ * reason other than EAGAIN or EINTR, a negative error code is returned.
  *
  * In any case, \a num_bytes contains the number of bytes that have been
  * successfully read from \a fd (zero if the first readv() call failed with
@@ -230,7 +226,7 @@ int readv_nonblock(int fd, struct iovec *iov, int iovcnt, fd_set *rfds,
                if (ret == 0)
                        return -E_EOF;
                if (ret < 0) {
-                       if (errno == EAGAIN)
+                       if (errno == EAGAIN || errno == EINTR)
                                return 0;
                        return -ERRNO_TO_PARA_ERROR(errno);
                }
@@ -320,9 +316,9 @@ out:
  *
  * \param fn The file name.
  *
- * \return Non-zero iff file exists.
+ * \return True iff file exists.
  */
-int file_exists(const char *fn)
+bool file_exists(const char *fn)
 {
        struct stat statbuf;
 
@@ -423,34 +419,6 @@ void para_fd_set(int fd, fd_set *fds, int *max_fileno)
        *max_fileno = PARA_MAX(*max_fileno, fd);
 }
 
-/**
- * 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.
  *
@@ -459,22 +427,20 @@ again:
  * 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.
  * \param map Result pointer.
  *
  * \return Standard.
  *
  * \sa mmap(2).
  */
-int para_mmap(size_t length, int prot, int flags, int fd, off_t offset,
-               void *map)
+int para_mmap(size_t length, int prot, int flags, int fd, void *map)
 {
        void **m = map;
 
        errno = EINVAL;
        if (!length)
                goto err;
-       *m = mmap(NULL, length, prot, flags, fd, offset);
+       *m = mmap(NULL, length, prot, flags, fd, (off_t)0);
        if (*m != MAP_FAILED)
                return 1;
 err:
@@ -643,7 +609,7 @@ int mmap_full_file(const char *path, int open_mode, void **map,
        if (S_ISDIR(file_status.st_mode))
                goto out;
 
-       ret = para_mmap(*size, mmap_prot, mmap_flags, fd, 0, map);
+       ret = para_mmap(*size, mmap_prot, mmap_flags, fd, map);
 out:
        if (ret < 0 || !fd_ptr)
                close(fd);