#include <fcntl.h>
#include <unistd.h>
#include <limits.h>
+#include "syscall.h"
char *ctermid(char *s)
{
- static char *s2;
+ static char s2[L_ctermid];
int fd;
- if (!s) {
- if (!s2) s2 = malloc(L_ctermid);
- s = s2;
+ 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);
}
- fd = open("/dev/tty", O_WRONLY | O_NOCTTY);
- if (fd < 0)
- return strcpy(s, "");
- if (ttyname_r(fd, s, L_ctermid))
- strcpy(s, "");
- close(fd);
return s;
}