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CUSERID(3) BSD Library Functions Manual CUSERID(3)
cuserid -- get user name
Compatibility Library (libcompat, -lcompat)
This interface is available from the compatibility library, libcompat and has been obsoleted
The cuserid() function returns a character string representation of the user name associated
with the effective user ID of the calling process.
If buf is not the NULL pointer, the user name is copied into the memory referenced by buf.
The argument buf is assumed to point to an array at least L_cuserid (as defined in the
include file <stdio.h>) bytes long. Otherwise, the user name is copied to a static buffer.
If buf is not the NULL pointer, buf is returned; otherwise the address of the static buffer
If the user name could not be determined, if buf is not the NULL pointer, the null character
'\0' will be stored at *buf; otherwise the NULL pointer is returned.
The cuserid() function conforms to IEEE Std 1003.1-1988 (``POSIX.1'').
Due to irreconcilable differences in historic implementations, cuserid() was removed from
the ISO/IEC 9945-1:1990 (``POSIX.1'') standard. This implementation exists purely for com-
patibility with existing programs. New programs should use one of the following three
alternatives to obtain the user name:
1. getlogin() to return the user's login name.
2. getpwuid(geteuid()) to return the user name associated with the calling process'
effective user ID.
3. getpwuid(getuid()) to return the user name associated with the calling process'
real user ID.
BSD November 28, 1993 BSD
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