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