ref: f58d99aa7a97ba5f79af89f38b78d5924d4e35a2
dir: /sys/src/ape/lib/ap/plan9/cuserid.c/
#include <unistd.h>
#include <stdio.h>
#include <string.h>
/*
* BUG: supposed to be for effective uid,
* but plan9 doesn't have that concept
*/
char *
cuserid(char *s)
{
char *logname;
static char buf[L_cuserid];
if((logname = getlogin()) == NULL)
return(NULL);
if(s == 0)
s = buf;
strncpy(s, logname, sizeof buf);
return(s);
}