fdopen man page on SmartOS

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FDOPEN(3C)							    FDOPEN(3C)

       fdopen - associate a stream with a file descriptor

       #include <stdio.h>

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

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

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

       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
       w+, wb+ or w+b	Open a file  for  update  (reading  and
       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. A trailing F character can also be included in the mode argu‐
       ment as described in fopen(3C) to enable extended FILE facility.

       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

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

       The fdopen() function may fail if:

		 The fildes argument is not a valid file descriptor.

		 The mode argument is not a valid mode.

		 {FOPEN_MAX}   streams	are  currently	open  in  the  calling

		 {STREAM_MAX}  streams	are  currently	open  in  the  calling

		 There is insufficient space to allocate a buffer.

       A process is allowed to have at least {FOPEN_MAX} stdio streams open at
       a time. For 32-bit applications, however, the underlying ABIs  formerly
       required	 that  no file descriptor used to access the file underlying a
       stdio stream have a value greater than 255. To maintain binary compati‐
       bility  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:

       │Interface Stability │ See below.      │
       │MT-Level	    │ MT-Safe	      │

       The F character in the mode argument is Evolving. In all other respects
       this function is Standard.

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

				 Apr 18, 2006			    FDOPEN(3C)

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