23 lines
540 B
C
23 lines
540 B
C
#define _POSIX_C_SOURCE 200809L
|
|
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
|
|
int main(int argc, char * argv[]) {
|
|
char * logname = getlogin();
|
|
|
|
if(logname == NULL) {
|
|
switch(errno) {
|
|
case EMFILE: fprintf(stderr, "%s: all file descriptors open\n", argv[0]);
|
|
break;
|
|
case ENFILE: fprintf(stderr, "%s: too many files open", argv[0]); break;
|
|
default: fprintf(stderr, "%s: other/unknown error", argv[0]);
|
|
}
|
|
return 1;
|
|
}
|
|
else {
|
|
printf("%s\n", logname);
|
|
return 0;
|
|
}
|
|
} |