fclose(3C) Standard C Library Functions fclose(3C)NAMEfclose - close a stream
SYNOPSIS
#include <stdio.h>
int fclose(FILE *stream);
DESCRIPTION
The fclose() function causes the stream pointed to by stream to be
flushed and the associated file to be closed. Any unwritten buffered
data for the stream is written to the file; any unread buffered data is
discarded. The stream is disassociated from the file. If the associated
buffer was automatically allocated, it is deallocated.
The fclose() function marks for update the st_ctime and st_mtime fields
of the underlying file if the stream is writable and if buffered data
has not yet been written to the file. It will perform a close(2) oper‐
ation on the file descriptor that is associated with the stream pointed
to by stream.
After the call to fclose(), any use of stream causes undefined behav‐
ior.
The fclose() function is performed automatically for all open files
upon calling exit(2).
RETURN VALUES
Upon successful completion, fclose() returns 0. Otherwise, it returns
EOF and sets errno to indicate the error.
ERRORS
The fclose() function will fail if:
EAGAIN The O_NONBLOCK flag is set for the file descriptor
underlying stream and the process would be delayed in
the write operation.
EBADF The file descriptor underlying stream is not valid.
EFBIG An attempt was made to write a file that exceeds the
maximum file size or the process's file size limit; or
the file is a regular file and an attempt was made to
write at or beyond the offset maximum associated with
the corresponding stream.
EINTR The fclose() function was interrupted by a signal.
EIO The process is a member of a background process group
attempting to write to its controlling terminal, TOSTOP
is set, the process is neither ignoring nor blocking
SIGTTOU and the process group of the process is
orphaned.
ENOSPC There was no free space remaining on the device con‐
taining the file.
EPIPE An attempt is made to write to a pipe or FIFO that is
not open for reading by any process. A SIGPIPE signal
will also be sent to the calling thread.
The fclose() function may fail if:
ENXIO A request was made of a non-existent device, or the
request was beyond the limits of the device.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Standard │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │MT-Safe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOclose(2), exit(2), getrlimit(2), ulimit(2), fopen(3C), stdio(3C),
attributes(5), standards(5)SunOS 5.10 1 Nov 2003 fclose(3C)
