avoid setting errno when checking for tty

setting errno here is completely valid, but some programs, notably
busybox printf, assume that errno will not be set during output and
treat this as an error condition. in any case, skipping it slightly
reduces code size and saves time.

2 files changed, 2 insertions, 2 deletions

diff --git a/src/stdio/__fdopen.c b/src/stdio/__fdopen.c
index 235d348f..a0102674 100644
--- a/src/stdio/__fdopen.c
+++ b/src/stdio/__fdopen.c
@@ -30,7 +30,7 @@ FILE *__fdopen(int fd, const char *mode)
 
 	/* Activate line buffered mode for terminals */
 	f->lbf = EOF;
-	if (!(f->flags & F_NOWR) && !syscall(SYS_ioctl, fd, TCGETS, &tio))
+	if (!(f->flags & F_NOWR) && !__syscall(SYS_ioctl, fd, TCGETS, &tio))
 		f->lbf = '\n';
 
 	/* Initialize op ptrs. No problem if some are unneeded. */
diff --git a/src/stdio/__stdout_write.c b/src/stdio/__stdout_write.c
index 4683ffc3..0cf71236 100644
--- a/src/stdio/__stdout_write.c
+++ b/src/stdio/__stdout_write.c
@@ -4,7 +4,7 @@ size_t __stdout_write(FILE *f, const unsigned char *buf, size_t len)
 {
 	struct termios tio;
 	f->write = __stdio_write;
-	if (!(f->flags & F_SVB) && syscall(SYS_ioctl, f->fd, TCGETS, &tio))
+	if (!(f->flags & F_SVB) && __syscall(SYS_ioctl, f->fd, TCGETS, &tio))
 		f->lbf = -1;
 	return __stdio_write(f, buf, len);
 }