File I/O Handling Functions
[Apache Portability Runtime library]

Modules

 File Open Flags/Routines
 File Seek Flags
 File Attribute Flags
 {_full} max iovec size
 File Lock Types

Typedefs

typedef apr_uint32_t apr_fileattrs_t
typedef int apr_seek_where_t
typedef struct apr_file_t apr_file_t

Functions

apr_status_t apr_file_open (apr_file_t **newf, const char *fname, apr_int32_t flag, apr_fileperms_t perm, apr_pool_t *pool)
apr_status_t apr_file_close (apr_file_t *file)
apr_status_t apr_file_remove (const char *path, apr_pool_t *pool)
apr_status_t apr_file_rename (const char *from_path, const char *to_path, apr_pool_t *pool)
apr_status_t apr_file_link (const char *from_path, const char *to_path)
apr_status_t apr_file_copy (const char *from_path, const char *to_path, apr_fileperms_t perms, apr_pool_t *pool)
apr_status_t apr_file_append (const char *from_path, const char *to_path, apr_fileperms_t perms, apr_pool_t *pool)
apr_status_t apr_file_eof (apr_file_t *fptr)
apr_status_t apr_file_open_stderr (apr_file_t **thefile, apr_pool_t *pool)
apr_status_t apr_file_open_stdout (apr_file_t **thefile, apr_pool_t *pool)
apr_status_t apr_file_open_stdin (apr_file_t **thefile, apr_pool_t *pool)
apr_status_t apr_file_open_flags_stderr (apr_file_t **thefile, apr_int32_t flags, apr_pool_t *pool)
apr_status_t apr_file_open_flags_stdout (apr_file_t **thefile, apr_int32_t flags, apr_pool_t *pool)
apr_status_t apr_file_open_flags_stdin (apr_file_t **thefile, apr_int32_t flags, apr_pool_t *pool)
apr_status_t apr_file_read (apr_file_t *thefile, void *buf, apr_size_t *nbytes)
apr_status_t apr_file_write (apr_file_t *thefile, const void *buf, apr_size_t *nbytes)
apr_status_t apr_file_writev (apr_file_t *thefile, const struct iovec *vec, apr_size_t nvec, apr_size_t *nbytes)
apr_status_t apr_file_read_full (apr_file_t *thefile, void *buf, apr_size_t nbytes, apr_size_t *bytes_read)
apr_status_t apr_file_write_full (apr_file_t *thefile, const void *buf, apr_size_t nbytes, apr_size_t *bytes_written)
apr_status_t apr_file_writev_full (apr_file_t *thefile, const struct iovec *vec, apr_size_t nvec, apr_size_t *nbytes)
apr_status_t apr_file_putc (char ch, apr_file_t *thefile)
apr_status_t apr_file_getc (char *ch, apr_file_t *thefile)
apr_status_t apr_file_ungetc (char ch, apr_file_t *thefile)
apr_status_t apr_file_gets (char *str, int len, apr_file_t *thefile)
apr_status_t apr_file_puts (const char *str, apr_file_t *thefile)
apr_status_t apr_file_flush (apr_file_t *thefile)
apr_status_t apr_file_sync (apr_file_t *thefile)
apr_status_t apr_file_datasync (apr_file_t *thefile)
apr_status_t apr_file_dup (apr_file_t **new_file, apr_file_t *old_file, apr_pool_t *p)
apr_status_t apr_file_dup2 (apr_file_t *new_file, apr_file_t *old_file, apr_pool_t *p)
apr_status_t apr_file_setaside (apr_file_t **new_file, apr_file_t *old_file, apr_pool_t *p)
apr_status_t apr_file_buffer_set (apr_file_t *thefile, char *buffer, apr_size_t bufsize)
apr_size_t apr_file_buffer_size_get (apr_file_t *thefile)
apr_status_t apr_file_seek (apr_file_t *thefile, apr_seek_where_t where, apr_off_t *offset)
apr_status_t apr_file_pipe_create (apr_file_t **in, apr_file_t **out, apr_pool_t *pool)
apr_status_t apr_file_pipe_create_ex (apr_file_t **in, apr_file_t **out, apr_int32_t blocking, apr_pool_t *pool)
apr_status_t apr_file_namedpipe_create (const char *filename, apr_fileperms_t perm, apr_pool_t *pool)
apr_status_t apr_file_pipe_timeout_get (apr_file_t *thepipe, apr_interval_time_t *timeout)
apr_status_t apr_file_pipe_timeout_set (apr_file_t *thepipe, apr_interval_time_t timeout)
apr_status_t apr_file_lock (apr_file_t *thefile, int type)
apr_status_t apr_file_unlock (apr_file_t *thefile)
apr_status_t apr_file_name_get (const char **new_path, apr_file_t *thefile)
apr_status_t apr_file_data_get (void **data, const char *key, apr_file_t *file)
apr_status_t apr_file_data_set (apr_file_t *file, void *data, const char *key, apr_status_t(*cleanup)(void *))
int apr_file_printf (apr_file_t *fptr, const char *format,...)
apr_status_t apr_file_perms_set (const char *fname, apr_fileperms_t perms)
apr_status_t apr_file_attrs_set (const char *fname, apr_fileattrs_t attributes, apr_fileattrs_t attr_mask, apr_pool_t *pool)
apr_status_t apr_file_mtime_set (const char *fname, apr_time_t mtime, apr_pool_t *pool)
apr_status_t apr_dir_make (const char *path, apr_fileperms_t perm, apr_pool_t *pool)
apr_status_t apr_dir_make_recursive (const char *path, apr_fileperms_t perm, apr_pool_t *pool)
apr_status_t apr_dir_remove (const char *path, apr_pool_t *pool)
apr_status_t apr_file_info_get (apr_finfo_t *finfo, apr_int32_t wanted, apr_file_t *thefile)
apr_status_t apr_file_trunc (apr_file_t *fp, apr_off_t offset)
apr_int32_t apr_file_flags_get (apr_file_t *f)
apr_pool_t * apr_file_pool_get (const apr_file_t *thefile)
apr_status_t apr_file_inherit_set (apr_file_t *thefile)
apr_status_t apr_file_inherit_unset (apr_file_t *thefile)
apr_status_t apr_file_mktemp (apr_file_t **fp, char *templ, apr_int32_t flags, apr_pool_t *p)
apr_status_t apr_temp_dir_get (const char **temp_dir, apr_pool_t *p)

Typedef Documentation

typedef struct apr_file_t apr_file_t

Structure for referencing files.

typedef apr_uint32_t apr_fileattrs_t

File attributes

typedef int apr_seek_where_t

Type to pass as whence argument to apr_file_seek.

Function Documentation

apr_status_t apr_dir_make ( const char *  path,
apr_fileperms_t  perm,
apr_pool_t *  pool 
)

Create a new directory on the file system.

Parameters:
path the path for the directory to be created. (use / on all systems)
perm Permissions for the new directory.
pool the pool to use.
apr_status_t apr_dir_make_recursive ( const char *  path,
apr_fileperms_t  perm,
apr_pool_t *  pool 
)

Creates a new directory on the file system, but behaves like 'mkdir -p'. Creates intermediate directories as required. No error will be reported if PATH already exists.

Parameters:
path the path for the directory to be created. (use / on all systems)
perm Permissions for the new directory.
pool the pool to use.
apr_status_t apr_dir_remove ( const char *  path,
apr_pool_t *  pool 
)

Remove directory from the file system.

Parameters:
path the path for the directory to be removed. (use / on all systems)
pool the pool to use.
Remarks:
Removing a directory which is in-use (e.g., the current working directory, or during apr_dir_read, or with an open file) is not portable.
apr_status_t apr_file_append ( const char *  from_path,
const char *  to_path,
apr_fileperms_t  perms,
apr_pool_t *  pool 
)

Append the specified file to another file.

Parameters:
from_path The full path to the source file (use / on all systems)
to_path The full path to the destination file (use / on all systems)
perms Access permissions for the destination file if it is created. In place of the usual or'd combination of file permissions, the value APR_FPROT_FILE_SOURCE_PERMS may be given, in which case the source file's permissions are copied.
pool The pool to use.
Remarks:
The new file does not need to exist, it will be created if required.
apr_status_t apr_file_attrs_set ( const char *  fname,
apr_fileattrs_t  attributes,
apr_fileattrs_t  attr_mask,
apr_pool_t *  pool 
)

Set attributes of the specified file.

Parameters:
fname The full path to the file (using / on all systems)
attributes Or'd combination of

attr_mask Mask of valid bits in attributes.
pool the pool to use.
Remarks:
This function should be used in preference to explicit manipulation of the file permissions, because the operations to provide these attributes are platform specific and may involve more than simply setting permission bits.
Warning:
Platforms which do not implement this feature will return APR_ENOTIMPL.
apr_status_t apr_file_buffer_set ( apr_file_t *  thefile,
char *  buffer,
apr_size_t  bufsize 
)

Give the specified apr file handle a new buffer

Parameters:
thefile The file handle that is to be modified
buffer The buffer
bufsize The size of the buffer
Remarks:
It is possible to add a buffer to previously unbuffered file handles, the APR_FOPEN_BUFFERED flag will be added to the file handle's flags. Likewise, with buffer=NULL and bufsize=0 arguments it is possible to make a previously buffered file handle unbuffered.
apr_size_t apr_file_buffer_size_get ( apr_file_t *  thefile  ) 

Get the size of any buffer for the specified apr file handle

Parameters:
thefile The file handle
apr_status_t apr_file_close ( apr_file_t *  file  ) 

Close the specified file.

Parameters:
file The file descriptor to close.
apr_status_t apr_file_copy ( const char *  from_path,
const char *  to_path,
apr_fileperms_t  perms,
apr_pool_t *  pool 
)

Copy the specified file to another file.

Parameters:
from_path The full path to the original file (using / on all systems)
to_path The full path to the new file (using / on all systems)
perms Access permissions for the new file if it is created. In place of the usual or'd combination of file permissions, the value APR_FPROT_FILE_SOURCE_PERMS may be given, in which case the source file's permissions are copied.
pool The pool to use.
Remarks:
The new file does not need to exist, it will be created if required.
Warning:
If the new file already exists, its contents will be overwritten.
apr_status_t apr_file_data_get ( void **  data,
const char *  key,
apr_file_t *  file 
)

Return the data associated with the current file.

Parameters:
data The user data associated with the file.
key The key to use for retrieving data associated with this file.
file The currently open file.
apr_status_t apr_file_data_set ( apr_file_t *  file,
void *  data,
const char *  key,
apr_status_t(*)(void *)  cleanup 
)

Set the data associated with the current file.

Parameters:
file The currently open file.
data The user data to associate with the file.
key The key to use for associating data with the file.
cleanup The cleanup routine to use when the file is destroyed.
apr_status_t apr_file_datasync ( apr_file_t *  thefile  ) 

Transfer all file modified data to disk.

Parameters:
thefile The file descriptor to sync
apr_status_t apr_file_dup ( apr_file_t **  new_file,
apr_file_t *  old_file,
apr_pool_t *  p 
)

Duplicate the specified file descriptor.

Parameters:
new_file The structure to duplicate into.
old_file The file to duplicate.
p The pool to use for the new file.
Remarks:
*new_file must point to a valid apr_file_t, or point to NULL.
apr_status_t apr_file_dup2 ( apr_file_t *  new_file,
apr_file_t *  old_file,
apr_pool_t *  p 
)

Duplicate the specified file descriptor and close the original

Parameters:
new_file The old file that is to be closed and reused
old_file The file to duplicate
p The pool to use for the new file
Remarks:
new_file MUST point at a valid apr_file_t. It cannot be NULL.
apr_status_t apr_file_eof ( apr_file_t *  fptr  ) 

Are we at the end of the file

Parameters:
fptr The apr file we are testing.
Remarks:
Returns APR_EOF if we are at the end of file, APR_SUCCESS otherwise.
apr_int32_t apr_file_flags_get ( apr_file_t *  f  ) 

Retrieve the flags that were passed into apr_file_open() when the file was opened.

Returns:
apr_int32_t the flags
apr_status_t apr_file_flush ( apr_file_t *  thefile  ) 

Flush the file's buffer.

Parameters:
thefile The file descriptor to flush
apr_status_t apr_file_getc ( char *  ch,
apr_file_t *  thefile 
)

Read a character from the specified file.

Parameters:
ch The character to read into
thefile The file descriptor to read from
apr_status_t apr_file_gets ( char *  str,
int  len,
apr_file_t *  thefile 
)

Read a line from the specified file

Parameters:
str The buffer to store the string in.
len The length of the string
thefile The file descriptor to read from
Remarks:
The buffer will be NUL-terminated if any characters are stored. The newline at the end of the line will not be stripped.
apr_status_t apr_file_info_get ( apr_finfo_t *  finfo,
apr_int32_t  wanted,
apr_file_t *  thefile 
)

get the specified file's stats.

Parameters:
finfo Where to store the information about the file.
wanted The desired apr_finfo_t fields, as a bit flag of APR_FINFO_* values
thefile The file to get information about.
apr_status_t apr_file_inherit_set ( apr_file_t *  thefile  ) 

Set a file to be inherited by child processes.

apr_status_t apr_file_inherit_unset ( apr_file_t *  thefile  ) 

Unset a file from being inherited by child processes.

apr_status_t apr_file_link ( const char *  from_path,
const char *  to_path 
)

Create a hard link to the specified file.

Parameters:
from_path The full path to the original file (using / on all systems)
to_path The full path to the new file (using / on all systems)
Remarks:
Both files must reside on the same device.
apr_status_t apr_file_lock ( apr_file_t *  thefile,
int  type 
)

file (un)locking functions. Establish a lock on the specified, open file. The lock may be advisory or mandatory, at the discretion of the platform. The lock applies to the file as a whole, rather than a specific range. Locks are established on a per-thread/process basis; a second lock by the same thread will not block.

Parameters:
thefile The file to lock.
type The type of lock to establish on the file.
apr_status_t apr_file_mktemp ( apr_file_t **  fp,
char *  templ,
apr_int32_t  flags,
apr_pool_t *  p 
)

Open a temporary file

Parameters:
fp The apr file to use as a temporary file.
templ The template to use when creating a temp file.
flags The flags to open the file with. If this is zero, the file is opened with APR_FOPEN_CREATE | APR_FOPEN_READ | APR_FOPEN_WRITE | APR_FOPEN_EXCL | APR_FOPEN_DELONCLOSE
p The pool to allocate the file out of.
Remarks:
This function generates a unique temporary file name from template. The last six characters of template must be XXXXXX and these are replaced with a string that makes the filename unique. Since it will be modified, template must not be a string constant, but should be declared as a character array.
apr_status_t apr_file_mtime_set ( const char *  fname,
apr_time_t  mtime,
apr_pool_t *  pool 
)

Set the mtime of the specified file.

Parameters:
fname The full path to the file (using / on all systems)
mtime The mtime to apply to the file.
pool The pool to use.
Warning:
Platforms which do not implement this feature will return APR_ENOTIMPL.
apr_status_t apr_file_name_get ( const char **  new_path,
apr_file_t *  thefile 
)

accessor and general file_io functions. return the file name of the current file.

Parameters:
new_path The path of the file.
thefile The currently open file.
apr_status_t apr_file_namedpipe_create ( const char *  filename,
apr_fileperms_t  perm,
apr_pool_t *  pool 
)

Create a named pipe.

Parameters:
filename The filename of the named pipe
perm The permissions for the newly created pipe.
pool The pool to operate on.
apr_status_t apr_file_open ( apr_file_t **  newf,
const char *  fname,
apr_int32_t  flag,
apr_fileperms_t  perm,
apr_pool_t *  pool 
)

Open the specified file.

Parameters:
newf The opened file descriptor.
fname The full path to the file (using / on all systems)
flag Or'ed value of:

perm Access permissions for file.
pool The pool to use.
Remarks:
If perm is APR_FPROT_OS_DEFAULT and the file is being created, appropriate default permissions will be used.
By default, the returned file descriptor will not be inherited by child processes created by apr_proc_create(). This can be changed using apr_file_inherit_set().
apr_status_t apr_file_open_flags_stderr ( apr_file_t **  thefile,
apr_int32_t  flags,
apr_pool_t *  pool 
)

open standard error as an apr file pointer, with flags.

Parameters:
thefile The apr file to use as stderr.
flags The flags to open the file with. Only the

flags should be used. The APR_FOPEN_WRITE flag will be set unconditionally.

pool The pool to allocate the file out of.
Remarks:
See remarks for apr_file_open_stderr().
apr_status_t apr_file_open_flags_stdin ( apr_file_t **  thefile,
apr_int32_t  flags,
apr_pool_t *  pool 
)

open standard input as an apr file pointer, with flags.

Parameters:
thefile The apr file to use as stdin.
flags The flags to open the file with. Only the

flags should be used. The APR_FOPEN_WRITE flag will be set unconditionally.

pool The pool to allocate the file out of.
Remarks:
See remarks for apr_file_open_stderr().
apr_status_t apr_file_open_flags_stdout ( apr_file_t **  thefile,
apr_int32_t  flags,
apr_pool_t *  pool 
)

open standard output as an apr file pointer, with flags.

Parameters:
thefile The apr file to use as stdout.
flags The flags to open the file with. Only the

flags should be used. The APR_FOPEN_WRITE flag will be set unconditionally.

pool The pool to allocate the file out of.
Remarks:
See remarks for apr_file_open_stderr().
apr_status_t apr_file_open_stderr ( apr_file_t **  thefile,
apr_pool_t *  pool 
)

Open standard error as an apr file pointer.

Parameters:
thefile The apr file to use as stderr.
pool The pool to allocate the file out of.
Remarks:
The only reason that the apr_file_open_std* functions exist is that you may not always have a stderr/out/in on Windows. This is generally a problem with newer versions of Windows and services.
The other problem is that the C library functions generally work differently on Windows and Unix. So, by using apr_file_open_std* functions, you can get a handle to an APR struct that works with the APR functions which are supposed to work identically on all platforms.
apr_status_t apr_file_open_stdin ( apr_file_t **  thefile,
apr_pool_t *  pool 
)

open standard input as an apr file pointer.

Parameters:
thefile The apr file to use as stdin.
pool The pool to allocate the file out of.
Remarks:
See remarks for apr_file_open_stderr().
apr_status_t apr_file_open_stdout ( apr_file_t **  thefile,
apr_pool_t *  pool 
)

open standard output as an apr file pointer.

Parameters:
thefile The apr file to use as stdout.
pool The pool to allocate the file out of.
Remarks:
See remarks for apr_file_open_stderr().
apr_status_t apr_file_perms_set ( const char *  fname,
apr_fileperms_t  perms 
)

set the specified file's permission bits.

Parameters:
fname The file (name) to apply the permissions to.
perms The permission bits to apply to the file.
Warning:
Some platforms may not be able to apply all of the available permission bits; APR_INCOMPLETE will be returned if some permissions are specified which could not be set.
Platforms which do not implement this feature will return APR_ENOTIMPL.
apr_status_t apr_file_pipe_create ( apr_file_t **  in,
apr_file_t **  out,
apr_pool_t *  pool 
)

Create an anonymous pipe.

Parameters:
in The newly created pipe's file for reading.
out The newly created pipe's file for writing.
pool The pool to operate on.
Remarks:
By default, the returned file descriptors will be inherited by child processes created using apr_proc_create(). This can be changed using apr_file_inherit_unset().
Bug:
Some platforms cannot toggle between blocking and nonblocking, and when passing a pipe as a standard handle to an application which does not expect it, a non-blocking stream will fluxor the client app.
Deprecated:
See also:
apr_file_pipe_create_ex()
apr_status_t apr_file_pipe_create_ex ( apr_file_t **  in,
apr_file_t **  out,
apr_int32_t  blocking,
apr_pool_t *  pool 
)

Create an anonymous pipe which portably supports async timeout options.

Parameters:
in The newly created pipe's file for reading.
out The newly created pipe's file for writing.
blocking one of these values defined in apr_thread_proc.h;

pool The pool to operate on.
Remarks:
By default, the returned file descriptors will be inherited by child processes created using apr_proc_create(). This can be changed using apr_file_inherit_unset().
Some platforms cannot toggle between blocking and nonblocking, and when passing a pipe as a standard handle to an application which does not expect it, a non-blocking stream will fluxor the client app. Use this function rather than apr_file_pipe_create() to create pipes where one or both ends require non-blocking semantics.
apr_status_t apr_file_pipe_timeout_get ( apr_file_t *  thepipe,
apr_interval_time_t *  timeout 
)

Get the timeout value for a pipe or manipulate the blocking state.

Parameters:
thepipe The pipe we are getting a timeout for.
timeout The current timeout value in microseconds.
apr_status_t apr_file_pipe_timeout_set ( apr_file_t *  thepipe,
apr_interval_time_t  timeout 
)

Set the timeout value for a pipe or manipulate the blocking state.

Parameters:
thepipe The pipe we are setting a timeout on.
timeout The timeout value in microseconds. Values < 0 mean wait forever, 0 means do not wait at all.
apr_pool_t* apr_file_pool_get ( const apr_file_t *  thefile  ) 

Get the pool used by the file.

int apr_file_printf ( apr_file_t *  fptr,
const char *  format,
  ... 
)

Write a string to a file using a printf format.

Parameters:
fptr The file to write to.
format The format string
... The values to substitute in the format string
Returns:
The number of bytes written
apr_status_t apr_file_putc ( char  ch,
apr_file_t *  thefile 
)

Write a character into the specified file.

Parameters:
ch The character to write.
thefile The file descriptor to write to
apr_status_t apr_file_puts ( const char *  str,
apr_file_t *  thefile 
)

Write the string into the specified file.

Parameters:
str The string to write.
thefile The file descriptor to write to
apr_status_t apr_file_read ( apr_file_t *  thefile,
void *  buf,
apr_size_t *  nbytes 
)

Read data from the specified file.

Parameters:
thefile The file descriptor to read from.
buf The buffer to store the data to.
nbytes On entry, the number of bytes to read; on exit, the number of bytes read.
Remarks:
apr_file_read() will read up to the specified number of bytes, but never more. If there isn't enough data to fill that number of bytes, all of the available data is read. The third argument is modified to reflect the number of bytes read. If a char was put back into the stream via ungetc, it will be the first character returned.
It is not possible for both bytes to be read and an APR_EOF or other error to be returned. APR_EINTR is never returned.
apr_status_t apr_file_read_full ( apr_file_t *  thefile,
void *  buf,
apr_size_t  nbytes,
apr_size_t *  bytes_read 
)

Read data from the specified file, ensuring that the buffer is filled before returning.

Parameters:
thefile The file descriptor to read from.
buf The buffer to store the data to.
nbytes The number of bytes to read.
bytes_read If non-NULL, this will contain the number of bytes read.
Remarks:
apr_file_read_full() will read up to the specified number of bytes, but never more. If there isn't enough data to fill that number of bytes, then the process/thread will block until it is available or EOF is reached. If a char was put back into the stream via ungetc, it will be the first character returned.
It is possible for both bytes to be read and an error to be returned. And if *bytes_read is less than nbytes, an accompanying error is _always_ returned.
APR_EINTR is never returned.
apr_status_t apr_file_remove ( const char *  path,
apr_pool_t *  pool 
)

Delete the specified file.

Parameters:
path The full path to the file (using / on all systems)
pool The pool to use.
Remarks:
If the file is open, it won't be removed until all instances are closed.
apr_status_t apr_file_rename ( const char *  from_path,
const char *  to_path,
apr_pool_t *  pool 
)

Rename the specified file.

Parameters:
from_path The full path to the original file (using / on all systems)
to_path The full path to the new file (using / on all systems)
pool The pool to use.
Warning:
If a file exists at the new location, then it will be overwritten. Moving files or directories across devices may not be possible.
apr_status_t apr_file_seek ( apr_file_t *  thefile,
apr_seek_where_t  where,
apr_off_t *  offset 
)

Move the read/write file offset to a specified byte within a file.

Parameters:
thefile The file descriptor
where How to move the pointer, one of:

  • APR_SET -- set the offset to offset
  • APR_CUR -- add the offset to the current position
  • APR_END -- add the offset to the current file size
offset The offset to move the pointer to.
Remarks:
The third argument is modified to be the offset the pointer was actually moved to.
apr_status_t apr_file_setaside ( apr_file_t **  new_file,
apr_file_t *  old_file,
apr_pool_t *  p 
)

Move the specified file descriptor to a new pool

Parameters:
new_file Pointer in which to return the new apr_file_t
old_file The file to move
p The pool to which the descriptor is to be moved
Remarks:
Unlike apr_file_dup2(), this function doesn't do an OS dup() operation on the underlying descriptor; it just moves the descriptor's apr_file_t wrapper to a new pool.
The new pool need not be an ancestor of old_file's pool.
After calling this function, old_file may not be used
apr_status_t apr_file_sync ( apr_file_t *  thefile  ) 

Transfer all file modified data and metadata to disk.

Parameters:
thefile The file descriptor to sync
apr_status_t apr_file_trunc ( apr_file_t *  fp,
apr_off_t  offset 
)

Truncate the file's length to the specified offset

Parameters:
fp The file to truncate
offset The offset to truncate to.
Remarks:
The read/write file offset is repositioned to offset.
apr_status_t apr_file_ungetc ( char  ch,
apr_file_t *  thefile 
)

Put a character back onto a specified stream.

Parameters:
ch The character to write.
thefile The file descriptor to write to
apr_status_t apr_file_unlock ( apr_file_t *  thefile  ) 

Remove any outstanding locks on the file.

Parameters:
thefile The file to unlock.
apr_status_t apr_file_write ( apr_file_t *  thefile,
const void *  buf,
apr_size_t *  nbytes 
)

Write data to the specified file.

Parameters:
thefile The file descriptor to write to.
buf The buffer which contains the data.
nbytes On entry, the number of bytes to write; on exit, the number of bytes written.
Remarks:
apr_file_write() will write up to the specified number of bytes, but never more. If the OS cannot write that many bytes, it will write as many as it can. The third argument is modified to reflect the * number of bytes written.
It is possible for both bytes to be written and an error to be returned. APR_EINTR is never returned.
apr_status_t apr_file_write_full ( apr_file_t *  thefile,
const void *  buf,
apr_size_t  nbytes,
apr_size_t *  bytes_written 
)

Write data to the specified file, ensuring that all of the data is written before returning.

Parameters:
thefile The file descriptor to write to.
buf The buffer which contains the data.
nbytes The number of bytes to write.
bytes_written If non-NULL, set to the number of bytes written.
Remarks:
apr_file_write_full() will write up to the specified number of bytes, but never more. If the OS cannot write that many bytes, the process/thread will block until they can be written. Exceptional error such as "out of space" or "pipe closed" will terminate with an error.
It is possible for both bytes to be written and an error to be returned. And if *bytes_written is less than nbytes, an accompanying error is _always_ returned.
APR_EINTR is never returned.
apr_status_t apr_file_writev ( apr_file_t *  thefile,
const struct iovec *  vec,
apr_size_t  nvec,
apr_size_t *  nbytes 
)

Write data from iovec array to the specified file.

Parameters:
thefile The file descriptor to write to.
vec The array from which to get the data to write to the file.
nvec The number of elements in the struct iovec array. This must be smaller than APR_MAX_IOVEC_SIZE. If it isn't, the function will fail with APR_EINVAL.
nbytes The number of bytes written.
Remarks:
It is possible for both bytes to be written and an error to be returned. APR_EINTR is never returned.
apr_file_writev() is available even if the underlying operating system doesn't provide writev().
apr_status_t apr_file_writev_full ( apr_file_t *  thefile,
const struct iovec *  vec,
apr_size_t  nvec,
apr_size_t *  nbytes 
)

Write data from iovec array to the specified file, ensuring that all of the data is written before returning.

Parameters:
thefile The file descriptor to write to.
vec The array from which to get the data to write to the file.
nvec The number of elements in the struct iovec array. This must be smaller than APR_MAX_IOVEC_SIZE. If it isn't, the function will fail with APR_EINVAL.
nbytes The number of bytes written.
Remarks:
apr_file_writev_full() is available even if the underlying operating system doesn't provide writev().
apr_status_t apr_temp_dir_get ( const char **  temp_dir,
apr_pool_t *  p 
)

Find an existing directory suitable as a temporary storage location.

Parameters:
temp_dir The temp directory.
p The pool to use for any necessary allocations.
Remarks:
This function uses an algorithm to search for a directory that an an application can use for temporary storage.
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