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fdopen(3c)
fdopen(3C) Standard C Library Functions fdopen(3C)
NAME
fdopen - associate a stream with a file descriptor
SYNOPSIS
#include <stdio.h>
FILE *fdopen(int fildes, const char *mode);
DESCRIPTION
The fdopen() function associates a stream with a file descriptor
fildes.
The mode argument points to a string beginning with one of the follow‐
ing sequences:
tab(); lw(1.9i) lw(3.6i) r or rbOpen a file for reading. w or wbOpen a
file for writing. a or abOpen a file for writing at end of file. r+,
rb+ or r+bT{ Open a file for update (reading and writing). T} w+, wb+
or w+bT{ Open a file for update (reading and writing). T} a+, ab+ or
a+bT{ Open a file for update (reading and writing) at end of file. T}
Additional mode characters may be specified after those prefixes to set
various flags. The meaning of these strings is exactly as specified for
the fopen(3C) function, except that:
o modes beginning with w do not cause truncation of the file
o modes beginning with a cause a one-time fseek(3C) to set the
file-position indicator to the end of the file when fdopen()
is called, but do not force subsequent writes to the end un‐
less the underlying file descriptor was opened with the
O_APPEND flag
o modes beginning with w or a cannot create a new file
o the use of x has no effect
o The FD_CLOEXEC flag of fildes shall be unchanged if e was
not present, and shall be set if e is present.
o The FD_CLOFORK flag of fildes shall be unchanged if f was
not present, and shall be set if f is present.
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, unless the mode string started with an a.
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.
RETURN VALUES
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.
ERRORS
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.
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.
When the stdio stream is no longer needed, it should be closed with
fclose(3C), which will close both the stdio stream and the associated
file descriptor. Once a file descriptor has been associated to a stdio
stream, it must not be closed via other methods, such as calling
close(2), but only via the fclose() function.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelMT-Safe _ Stan‐
dardSee standards(7).
SEE ALSO
creat(2), dup(2), open(2), pipe(2), fclose(3C), fmemopen(3C),
fopen(3C), attributes(7), standards(7)
HISTORY
The fdopen() function has been included in all Sun and Oracle releases
of Solaris.
Support for the "e" (FD_CLOEXEC) and "f" (FD_CLOFORK) characters in the
mode argument was added to Oracle Solaris in the 11.4.24 release.
Oracle Solaris 11.4 4 Aug 2022 fdopen(3C)