Return a string describing an errno.
String_Type errno_string (Integer_Type err)
The errno_string function returns a string describing the integer error code err. The variable err usually corresponds to the errno intrinsic function. See the description for errno for more information.
The errno_string function may be used as follows:
define sizeof_file (file) { variable st = stat (file); if (st == NULL) verror ("%s: %s", file, errno_string (errno); return st.st_size; }
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