use libc-internal malloc for pthread_atfork

[musl] / src / unistd / isatty.c

diff --git a/src/unistd/isatty.c b/src/unistd/isatty.c
index cff6e9f..75a9c18 100644 (file)
--- a/src/unistd/isatty.c
+++ b/src/unistd/isatty.c
@@ -1,8 +1,13 @@
 #include <unistd.h>
-#include <termios.h>
+#include <errno.h>
+#include <sys/ioctl.h>
+#include "syscall.h"
 
 int isatty(int fd)
 {
-       struct termios t;
-       return tcgetattr(fd, &t) == 0;
+       struct winsize wsz;
+       unsigned long r = syscall(SYS_ioctl, fd, TIOCGWINSZ, &wsz);
+       if (r == 0) return 1;
+       if (errno != EBADF) errno = ENOTTY;
+       return 0;
 }