53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* disalloc.c - aeb - 940501 - Disallocate virtual terminal(s)
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* Renamed deallocvt.
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*/
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#include "internal.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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/* From <linux/vt.h> */
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#define VT_DISALLOCATE 0x5608 /* free memory associated to vt */
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const char deallocvt_usage[] =
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"deallocvt N\n"
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#ifndef BB_FEATURE_TRIVIAL_HELP
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"\nDeallocate unused virtual terminal /dev/ttyN\n"
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#endif
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;
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int deallocvt_main(int argc, char *argv[])
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{
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int fd, num, i;
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if ((argc != 2) || (**(argv + 1) == '-'))
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usage(deallocvt_usage);
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fd = get_console_fd("/dev/console");
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if (argc == 1) {
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/* deallocate all unused consoles */
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if (ioctl(fd, VT_DISALLOCATE, 0)) {
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perror("VT_DISALLOCATE");
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exit( FALSE);
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}
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} else
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for (i = 1; i < argc; i++) {
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num = atoi(argv[i]);
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if (num == 0)
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errorMsg("0: illegal VT number\n");
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else if (num == 1)
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errorMsg("VT 1 cannot be deallocated\n");
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else if (ioctl(fd, VT_DISALLOCATE, num)) {
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perror("VT_DISALLOCATE");
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errorMsg("could not deallocate console %d\n", num);
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exit( FALSE);
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}
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}
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return( TRUE);
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}
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