FCLOSE(3C)FCLOSE(3C)NAMEfclose - close a stream
int fclose(FILE *stream);
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‐
The fclose() function is performed automatically for all open files
upon calling exit(2).
Upon successful completion, fclose() returns 0. Otherwise, it returns
EOF and sets errno to indicate the error.
The fclose() function will fail if:
The O_NONBLOCK flag is set for the file descriptor underlying
stream and the process would be delayed in the write opera‐
The file descriptor underlying stream is not valid.
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.
The fclose() function was interrupted by a signal.
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.
There was no free space remaining on the device containing
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:
A request was made of a non-existent device, or the request
was beyond the limits of the device.
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),
Nov 1, 2003 FCLOSE(3C)