1 files changed, 52 insertions, 0 deletions
diff --git a/src/stdio/__fdopen.c b/src/stdio/__fdopen.c
new file mode 100644
index 00000000..6ad7c57d
--- /dev/null
+++ b/src/stdio/__fdopen.c
@@ -0,0 +1,52 @@
+#include "stdio_impl.h"
+
+FILE *__fdopen(int fd, const char *mode)
+{
+	FILE *f;
+	struct termios tio;
+	int plus = !!strchr(mode, '+');
+
+	/* Check for valid initial mode character */
+	if (!strchr("rwa", *mode)) return 0;
+
+	/* Allocate FILE+buffer or fail */
+	if (!(f=malloc(sizeof *f + UNGET + BUFSIZ))) return 0;
+
+	/* Zero-fill only the struct, not the buffer */
+	memset(f, 0, sizeof *f);
+
+	/* Impose mode restrictions */
+	if (!plus) f->flags = (*mode == 'r') ? F_NOWR : F_NORD;
+
+	/* Set append mode on fd if opened for append */
+	if (*mode == 'a') {
+		int flags = __syscall_fcntl(fd, F_GETFL, 0);
+		__syscall_fcntl(fd, F_SETFL, flags | O_APPEND);
+	}
+
+	f->fd = fd;
+	f->buf = (unsigned char *)f + sizeof *f + UNGET;
+	f->buf_size = BUFSIZ;
+
+	/* Activate line buffered mode for terminals */
+	f->lbf = EOF;
+	if (!(f->flags & F_NOWR) && !__syscall_ioctl(fd, TCGETS, &tio))
+		f->lbf = '\n';
+
+	/* Initialize op ptrs. No problem if some are unneeded. */
+	f->read = __stdio_read;
+	f->write = __stdio_write;
+	f->seek = __stdio_seek;
+	f->close = __stdio_close;
+
+	/* Add new FILE to open file list */
+	OFLLOCK();
+	f->next = ofl_head;
+	if (ofl_head) ofl_head->prev = f;
+	ofl_head = f;
+	OFLUNLOCK();
+
+	return f;
+}
+
+weak_alias(__fdopen, fdopen);