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43 lines
1.1 KiB
Plaintext
43 lines
1.1 KiB
Plaintext
NAME
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freopen - close (if necessary) and reopen a filestream
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SYNOPSIS
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freopen(fs, mode) or freopen(fs, mode, filename)
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TYPES
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fs open or closed file stream
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mode one of the strings "r", "w", "a", "r+", "w+, "a+"
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filename string
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return null or error value
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DESCRIPTION
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With two arguments, this function closes the file stream fs and
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attempts to reopen it with the specified mode. A non-null value
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is returned only if the attempt fails.
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With three arguments, fs, if open, is closed, and an attempt is made to
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open the file with the specified name and assign it to the stream
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fs. A non-null value is returned only if the attempt fails.
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EXAMPLE
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> f = fopen("/tmp/junk", "w")
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> fputs(f, "Leonard Euler")
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> freopen(f, "r")
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> fgets(f)
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"Leonard Euler"
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> !chmod u-w /tmp/junk
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> freopen(f, "w")
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Error 10013
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LIMITS
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none - XXX - is this correct?
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LIBRARY
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none - XXX - is this correct?
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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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