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cuserid.0
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CUSERID(3) UNIX Programmer's Manual CUSERID(3)
NNAAMMEE
ccuusseerriidd - get user name
SSYYNNOOPPSSIISS
##iinncclluuddee <<ssttddiioo..hh>>
_c_h_a_r _*
ccuusseerriidd(_c_h_a_r _*_b_u_f)
DDEESSCCRRIIPPTTIIOONN
TThhiiss iinntteerrffaaccee iiss aavvaaiillaabbllee ffrroomm tthhee ccoommppaattiibbiilliittyy lliibbrraarryy,, lliibbccoommppaatt..
The ccuusseerriidd() function returns a character string representation of the
user name associated with the effective user ID of the calling process.
If _b_u_f is not the NULL pointer, the user name is copied into the memory
referenced by _b_u_f. The argument _b_u_f is assumed to point to an array at
least L_cuserid (as defined in the include file <_s_t_d_i_o_._h>) bytes long.
Otherwise, the user name is copied to a static buffer.
RREETTUURRNN VVAALLUUEESS
If _b_u_f is not the NULL pointer, _b_u_f is returned; otherwise the address of
the static buffer is returned.
If the user name could not be determined, if _b_u_f is not the NULL pointer,
the null character `\0' will be stored at _*_b_u_f; otherwise the NULL point-
er is returned.
SSEEEE AALLSSOO
getlogin(2), getpwent(3)
SSTTAANNDDAARRDDSS
The ccuusseerriidd() function conforms to IEEE Std1003.1-1988 (``POSIX'').
BBUUGGSS
Due to irreconcilable differences in historic implementations, ccuusseerriidd()
was removed from the standard. This implementation exists purely for
compatibility with existing programs. New programs should use one of the
following three alternatives to obtain the user name:
1. ggeettllooggiinn() to return the user's login name.
2. ggeettppwwuuiidd(ggeetteeuuiidd()) to return the user name associated with
the calling process' effective user ID.
3. ggeettppwwuuiidd(ggeettuuiidd()) to return the user name associated with the
calling process' real user ID.
The ccuusseerriidd() function uses ggeettppwwuuiidd(); thus the results of a user's call
to ggeettppwweenntt(), ggeettppwwnnaamm() or ggeettppwwuuiidd() will be overwritten by subsequent
calls to ccuusseerriidd().
BSD Experimental November 28, 1993 1