60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
/* $OpenBSD: tty.c,v 1.19 2021/10/24 21:24:21 deraadt Exp $ */
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <unistd.h>
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#include "sh.h"
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#include "tty.h"
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int tty_fd = -1; /* dup'd tty file descriptor */
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int tty_devtty; /* true if tty_fd is from /dev/tty */
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struct termios tty_state; /* saved tty state */
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void
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tty_close(void)
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{
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if (tty_fd >= 0) {
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close(tty_fd);
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tty_fd = -1;
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}
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}
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/* Initialize tty_fd. Used for saving/resetting tty modes upon
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* foreground job completion and for setting up tty process group.
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*/
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void
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tty_init(int init_ttystate)
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{
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int do_close = 1;
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int tfd;
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tty_close();
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tty_devtty = 1;
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tfd = open("/dev/tty", O_RDWR);
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if (tfd == -1) {
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tty_devtty = 0;
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warningf(false, "No controlling tty (open /dev/tty: %s)",
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strerror(errno));
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do_close = 0;
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if (isatty(0))
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tfd = 0;
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else if (isatty(2))
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tfd = 2;
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else {
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warningf(false, "Can't find tty file descriptor");
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return;
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}
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}
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if ((tty_fd = fcntl(tfd, F_DUPFD_CLOEXEC, FDBASE)) == -1) {
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warningf(false, "%s: dup of tty fd failed: %s",
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__func__, strerror(errno));
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} else if (init_ttystate)
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tcgetattr(tty_fd, &tty_state);
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if (do_close)
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close(tfd);
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}
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