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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _chmod function changes the permission setting of the file
     specified by <filename>. The permission setting controls read and
     write access to the file.
 
     The constant expression <pmode> contains one or both of the
     manifest constants _S_IWRITE and _S_IREAD, defined in SYS\STAT.H.
     Any other values for <pmode> are ignored. When both constants are
     given, they are joined with the bitwise-OR operator (|). The
     meaning of the <pmode> argument is determined by either the
     _S_IWRITE or _S_IREAD manifest constant.
 
     If write permission is not given, the file is read-only. Note that
     all files are readable; it is not possible to give write-only
     permission. Thus the modes _S_IWRITE and _S_IREAD | _S_IWRITE are
     equivalent.
 
     Return Value
 
     The _chmod function returns the value 0 if the permission setting
     is successfully changed. A return value of -1 indicates an error;
     in this case, errno is set to ENOENT, indicating that the
     specified file could not be found.
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