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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <limits.h>
#include "syscall.h"
char *ctermid(char *s)
{
static char s2[L_ctermid];
int fd;
if (!s) s = s2;
*s = 0;
fd = open("/dev/tty", O_WRONLY | O_NOCTTY | O_CLOEXEC);
if (fd >= 0) {
ttyname_r(fd, s, L_ctermid);
__syscall(SYS_close, fd);
}
return s;
}
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