64 lines
1.3 KiB
C
64 lines
1.3 KiB
C
/** $MirBSD: src/bin/ksh/tty.c,v 2.4 2004/12/31 17:42:45 tg Exp $ */
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/* $OpenBSD: tty.c,v 1.5 2004/12/18 22:35:41 millert Exp $ */
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#include "sh.h"
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#include "ksh_stat.h"
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#define EXTERN
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#include "tty.h"
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#undef EXTERN
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__RCSID("$MirBSD: src/bin/ksh/tty.c,v 2.4 2004/12/31 17:42:45 tg Exp $");
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/* Initialize tty_fd. Used for saving/reseting 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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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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tty_devtty = 1;
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if ((tfd = open("/dev/tty", O_RDWR, 0)) < 0) {
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tty_devtty = 0;
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warningf(false,
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"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 = ksh_dupbase(tfd, FDBASE)) < 0) {
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warningf(false, "j_ttyinit: dup of tty fd failed: %s",
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strerror(errno));
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} else if (fcntl(tty_fd, F_SETFD, FD_CLOEXEC) < 0) {
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warningf(false, "j_ttyinit: can't set close-on-exec flag: %s",
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strerror(errno));
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close(tty_fd);
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tty_fd = -1;
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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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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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