fdopen(3C)																fdopen(3C)

NAME

       fdopen - associate a stream with a file descriptor

SYNOPSIS

       #include <stdio.h>

       FILE *fdopen(int fildes, const char *mode);

       The fdopen() function associates a stream with a file descriptor fildes.

       The mode argument is a character string having one of the following values:

       r or rb		     Open a file for reading.
       w or wb		     Open a file for writing.
       a or ab		     Open  a  file  for writing at end of
			     file.
       r+, rb+ or r+b	     Open a file for update (reading  and
			     writing).
       w+, wb+ or w+b	     Open  a file for update (reading and
			     writing).
       a+, ab+ or a+b	     Open a file for update (reading  and
			     writing) at end of file.

       The  meaning  of these flags is exactly as specified for the fopen(3C) function, except that modes beginning with w do not cause truncation
       of the file.

       The mode of the stream must be allowed by the file access mode of the open file. The file position indicator associated with the new stream
       is set to the position indicated by the file offset associated with the file descriptor.

       The fdopen() function preserves the offset maximum previously set for the open file description corresponding to  fildes.

       The  error and end-of-file indicators for the stream are cleared. The fdopen() function may cause the st_atime field of the underlying file
       to be marked for update.

       If fildes refers to a shared memory object, the result of the fdopen() function is unspecified.

       Upon successful completion, fdopen() returns a pointer to a stream. Otherwise, a null pointer is returned and errno is set to indicate  the
       error.

       The fdopen() function may fail and not set errno if there are no free stdio streams.

       The fdopen() function may fail if:

       EBADF	       The fildes argument is not a valid file descriptor.

       EINVAL	       The mode argument is not a valid mode.

       EMFILE	       {FOPEN_MAX} streams are currently open in the calling process.

		       {STREAM_MAX} streams are currently open in the calling process.

       ENOMEM	       There is insufficient space to allocate a buffer.

USAGE

       A  process is allowed to have at least {FOPEN_MAX} stdio streams open at a time. For 32-bit applications, however, the underlying ABIs for-
       merly required that no file descriptor used to access the file underlying a stdio stream have a value greater than 255. To maintain  binary
       compatibility with earlier Solaris releases, this limit still constrains 32-bit applications.

       File descriptors are obtained from calls like open(2), dup(2), creat(2) or pipe(2), which open files but do not return streams. Streams are
       necessary input for almost all of the standard I/O library functions.

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

       creat(2), dup(2), open(2), pipe(2), fclose(3C), fopen(3C), attributes(5), standards(5)

								    18 May 2005 							fdopen(3C)