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| author | Eric Andersen <andersen@codepoet.org> | 1999-10-25 23:32:44 +0000 |
|---|---|---|
| committer | Eric Andersen <andersen@codepoet.org> | 1999-10-25 23:32:44 +0000 |
| commit | 0460ff2e5d443b485c2f6447c8c2ece1b3bec9c3 (patch) | |
| tree | d761a790ee864a0a566d29c9d56173763fa04888 /utility.c | |
| parent | d143e8f2bd03470e891a5e3ccca5734edd917e73 (diff) | |
| download | busybox-w32-0460ff2e5d443b485c2f6447c8c2ece1b3bec9c3.tar.gz busybox-w32-0460ff2e5d443b485c2f6447c8c2ece1b3bec9c3.tar.bz2 busybox-w32-0460ff2e5d443b485c2f6447c8c2ece1b3bec9c3.zip | |
Stuf
Diffstat (limited to 'utility.c')
| -rw-r--r-- | utility.c | 92 |
1 files changed, 92 insertions, 0 deletions
| @@ -720,5 +720,97 @@ extern int find_match(char *haystack, char *needle, int ignoreCase) | |||
| 720 | } | 720 | } |
| 721 | #endif | 721 | #endif |
| 722 | 722 | ||
| 723 | |||
| 724 | |||
| 725 | #if (defined BB_CHVT) || (defined BB_DEALLOCVT) | ||
| 726 | |||
| 727 | |||
| 728 | #include <linux/kd.h> | ||
| 729 | #include <sys/ioctl.h> | ||
| 730 | |||
| 731 | int is_a_console(int fd) | ||
| 732 | { | ||
| 733 | char arg; | ||
| 734 | |||
| 735 | arg = 0; | ||
| 736 | return (ioctl(fd, KDGKBTYPE, &arg) == 0 | ||
| 737 | && ((arg == KB_101) || (arg == KB_84))); | ||
| 738 | } | ||
| 739 | |||
| 740 | static int open_a_console(char *fnam) | ||
| 741 | { | ||
| 742 | int fd; | ||
| 743 | |||
| 744 | /* try read-only */ | ||
| 745 | fd = open(fnam, O_RDWR); | ||
| 746 | |||
| 747 | /* if failed, try read-only */ | ||
| 748 | if (fd < 0 && errno == EACCES) | ||
| 749 | fd = open(fnam, O_RDONLY); | ||
| 750 | |||
| 751 | /* if failed, try write-only */ | ||
| 752 | if (fd < 0 && errno == EACCES) | ||
| 753 | fd = open(fnam, O_WRONLY); | ||
| 754 | |||
| 755 | /* if failed, fail */ | ||
| 756 | if (fd < 0) | ||
| 757 | return -1; | ||
| 758 | |||
| 759 | /* if not a console, fail */ | ||
| 760 | if (! is_a_console(fd)) | ||
| 761 | { | ||
| 762 | close(fd); | ||
| 763 | return -1; | ||
| 764 | } | ||
| 765 | |||
| 766 | /* success */ | ||
| 767 | return fd; | ||
| 768 | } | ||
| 769 | |||
| 770 | /* | ||
| 771 | * Get an fd for use with kbd/console ioctls. | ||
| 772 | * We try several things because opening /dev/console will fail | ||
| 773 | * if someone else used X (which does a chown on /dev/console). | ||
| 774 | * | ||
| 775 | * if tty_name is non-NULL, try this one instead. | ||
| 776 | */ | ||
| 777 | |||
| 778 | int get_console_fd(char* tty_name) | ||
| 779 | { | ||
| 780 | int fd; | ||
| 781 | |||
| 782 | if (tty_name) | ||
| 783 | { | ||
| 784 | if (-1 == (fd = open_a_console(tty_name))) | ||
| 785 | return -1; | ||
| 786 | else | ||
| 787 | return fd; | ||
| 788 | } | ||
| 789 | |||
| 790 | fd = open_a_console("/dev/tty"); | ||
| 791 | if (fd >= 0) | ||
| 792 | return fd; | ||
| 793 | |||
| 794 | fd = open_a_console("/dev/tty0"); | ||
| 795 | if (fd >= 0) | ||
| 796 | return fd; | ||
| 797 | |||
| 798 | fd = open_a_console("/dev/console"); | ||
| 799 | if (fd >= 0) | ||
| 800 | return fd; | ||
| 801 | |||
| 802 | for (fd = 0; fd < 3; fd++) | ||
| 803 | if (is_a_console(fd)) | ||
| 804 | return fd; | ||
| 805 | |||
| 806 | fprintf(stderr, | ||
| 807 | "Couldnt get a file descriptor referring to the console\n"); | ||
| 808 | return -1; /* total failure */ | ||
| 809 | } | ||
| 810 | |||
| 811 | |||
| 812 | #endif | ||
| 813 | |||
| 814 | |||
| 723 | /* END CODE */ | 815 | /* END CODE */ |
| 724 | 816 | ||