mirror of
https://github.com/lcn2/calc.git
synced 2025-08-19 01:13:27 +03:00
53 lines
1.4 KiB
Plaintext
53 lines
1.4 KiB
Plaintext
NAME
|
|
fclose - close a file
|
|
|
|
SYNOPSIS
|
|
fclose(fd)
|
|
|
|
TYPES
|
|
fd file
|
|
|
|
return nul or int
|
|
|
|
DESCRIPTION
|
|
This function closes the open file associated with the descriptor fd.
|
|
When this is done, the file value associated with the file remains
|
|
a file value, but appears 'closed', and cannot be used in further
|
|
file-related calls (except fclose) without causing errors. This same
|
|
action occurs to all copies of the file value. You do not need to
|
|
explicitly close all the copies of a file value.
|
|
|
|
Standard input, standard output and standard error are always opened
|
|
and cannot be closed.
|
|
|
|
The truth value of an closed file is FALSE.
|
|
|
|
The fclose function returns the numeric value of errno if
|
|
there had been an error using the file, or the null value if
|
|
there was no error.
|
|
|
|
Closing a closed file is permitted. Fclose returns null in
|
|
this case.
|
|
|
|
EXAMPLE
|
|
> fd = fopen("/etc/motd", "r")
|
|
> if (fd) print "file is open";
|
|
file is open
|
|
|
|
> err = fclose(fd);
|
|
> if (isnull(err)) print "close successful"; else errno(err);
|
|
close successful
|
|
|
|
> if (!fd) print "file is closed";
|
|
file is closed
|
|
|
|
LIMITS
|
|
fd != files(0) && fd != files(1) && fd != files(2)
|
|
|
|
LIBRARY
|
|
none
|
|
|
|
SEE ALSO
|
|
errno, fclose, feof, ferror, fflush, fgetc, fgetline, fgets, files, fopen,
|
|
fprintf, fputc, fputs, fseek, fsize, ftell, isfile, printf, prompt
|