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Diffstat (limited to 'src/unistd/ctermid.c')
-rw-r--r--src/unistd/ctermid.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/src/unistd/ctermid.c b/src/unistd/ctermid.c
new file mode 100644
index 00000000..21b44ec8
--- /dev/null
+++ b/src/unistd/ctermid.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <limits.h>
+
+char *ctermid(char *s)
+{
+ static char *s2;
+ int fd;
+ if (!s) {
+ if (!s2) s2 = malloc(L_ctermid);
+ s = s2;
+ }
+ 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;
+}