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annotate toys/pending/openvt.c @ 1214:a31d747b0017 draft

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Please find the patches attached herewith for adding 3 new commands - 1. freeramdisk - If we unmount or detach the RAM disk based file system the Linux Kernel will not free the allocated memory associated with the RAM device. This can be useful if one wants to mount this device again: All data will be preserved. If we need to free the memory back to the Kernel, one can use the command: "toybox freeramdisk <RAM device>". 2. openvt - Successfully opens a new virtual terminal as mentioned with -c option otherwise search and open next available VT. with -s option it switches to new VT with -s -w option, it switch back successfully to originating VT. 3. deallocvt - Deallocate specified virtual teminal. if no virtual terminal is specified, it deallocates all unused VT.
author Vivek Bhagat <vivek.bhagat89@gmail.com>
date Sun, 09 Mar 2014 14:27:11 -0500
parents
children 3c855d5a75be
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1214
a31d747b0017 Please find the patches attached herewith for adding 3 new commands -
Vivek Bhagat <vivek.bhagat89@gmail.com>
parents:
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1 /* openvt.c - Run a program on a new VT
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2 *
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3 * Copyright 2014 Vivek Kumar Bhagat <vivek.bhagat89@gmail.com>
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4 *
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5 * No Standard
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6
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7 USE_OPENVT(NEWTOY(openvt, "c#<1>63sw", TOYFLAG_BIN|TOYFLAG_NEEDROOT))
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8
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9 config OPENVT
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10 bool "openvt"
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11 default n
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12 help
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13 usage: openvt [-c N] [-s] [-w] [--] [command [command_options]]
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14
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15 start a program on a new virtual terminal (VT)
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16
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17 -c N Use VT N
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18 -s Switch to new VT
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19 -w Wait for command to exit
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20 if -s and -w option used together, switch back
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21 to originating VT when command completes
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22 */
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23
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24 #define FOR_openvt
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25 #include "toys.h"
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26 #include <linux/vt.h>
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27 #include <linux/kd.h>
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28
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29 GLOBALS(
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30 unsigned long vt_num;
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31 )
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32
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33 int find_console_fd(void)
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34 {
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35 char *console_name[] = {"/dev/tty", "/dev/tty0", "/dev/console"};
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36 int i;
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37 int fd;
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38 char arg;
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39
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40 for (i = 0; i < 3; i++) {
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41 fd = open(console_name[i], O_RDWR);
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42 if (fd < 0 && errno == EACCES)
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43 fd = open(console_name[i], O_RDONLY);
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44
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45 if (fd < 0 && errno == EACCES)
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46 fd = open(console_name[i], O_WRONLY);
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47
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48 if (fd >= 0) {
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49 arg = 0;
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50 if (0 == ioctl(fd, KDGKBTYPE, &arg))
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51 return fd;
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52 else
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53 close(fd);
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54 }
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55 }
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56
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57 /* check std fd 0, 1 and 2 */
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58 for (fd = 0; fd < 3; fd++) {
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59 arg = 0;
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60 if (0 == ioctl(fd, KDGKBTYPE, &arg))
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61 return fd;
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62 }
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63
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64 return -1;
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65 }
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66
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67 int xvtnum(int fd)
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68 {
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69 int ret;
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70
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71 ret = ioctl(fd, VT_OPENQRY, (int *)&TT.vt_num);
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72 if (ret != 0 || TT.vt_num <= 0) perror_exit("can't find open VT");
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73
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74 return TT.vt_num;
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75 }
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76
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77 void openvt_main(void)
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78 {
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79 int fd = -1, vt_fd = -1, pid, ret = 0;
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80 struct vt_stat vstate;
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81
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82 if (!(toys.optflags & FLAG_c)) {
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83 // check if fd 0,1 or 2 is already opened
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84 for (fd = 0; fd < 3; fd++)
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85 if (!ioctl(fd, VT_GETSTATE, &vstate)) {
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86 ret = xvtnum(fd);
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87 break;
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88 }
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89
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90 // find VT number using /dev/console
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91 if (!ret) {
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92 fd = xopen("/dev/console", O_RDONLY | O_NONBLOCK);
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93 xioctl(fd, VT_GETSTATE, &vstate);
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94 xvtnum(fd);
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95 }
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96 }
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97
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98 sprintf(toybuf, "/dev/tty%lu", TT.vt_num);
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99 fd = find_console_fd();
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100 xioctl(fd, VT_GETSTATE, &vstate);
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101
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102 close(0); //new vt becomes stdin
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103 vt_fd = xopen(toybuf, O_RDWR);
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104 if (toys.optflags & FLAG_s) {
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105 ioctl(vt_fd, VT_ACTIVATE, TT.vt_num);
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106 ioctl(vt_fd, VT_WAITACTIVE, TT.vt_num);
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107 }
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108
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109 close(1);
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110 close(2);
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111 dup2(vt_fd, 1);
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112 dup2(vt_fd, 2);
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113 while (vt_fd > 2)
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114 close(vt_fd--);
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115
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116 pid = vfork();
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117 if (pid < 0) perror_exit("Fork failed");
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118 else if (!pid) {
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119 setsid();
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120 ioctl(vt_fd, TIOCSCTTY, 0);
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121 xexec(toys.optargs);
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122 }
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123
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124 if (toys.optflags & FLAG_w) {
a31d747b0017 Please find the patches attached herewith for adding 3 new commands -
Vivek Bhagat <vivek.bhagat89@gmail.com>
parents:
diff changeset
125 while (-1 == waitpid(pid, NULL, 0) && errno == EINTR)
a31d747b0017 Please find the patches attached herewith for adding 3 new commands -
Vivek Bhagat <vivek.bhagat89@gmail.com>
parents:
diff changeset
126 ;
a31d747b0017 Please find the patches attached herewith for adding 3 new commands -
Vivek Bhagat <vivek.bhagat89@gmail.com>
parents:
diff changeset
127 if (toys.optflags & FLAG_s) {
a31d747b0017 Please find the patches attached herewith for adding 3 new commands -
Vivek Bhagat <vivek.bhagat89@gmail.com>
parents:
diff changeset
128 ioctl(fd, VT_ACTIVATE, vstate.v_active);
a31d747b0017 Please find the patches attached herewith for adding 3 new commands -
Vivek Bhagat <vivek.bhagat89@gmail.com>
parents:
diff changeset
129 ioctl(fd, VT_WAITACTIVE, vstate.v_active);
a31d747b0017 Please find the patches attached herewith for adding 3 new commands -
Vivek Bhagat <vivek.bhagat89@gmail.com>
parents:
diff changeset
130 //check why deallocate isn't working here
a31d747b0017 Please find the patches attached herewith for adding 3 new commands -
Vivek Bhagat <vivek.bhagat89@gmail.com>
parents:
diff changeset
131 xioctl(fd, VT_DISALLOCATE, (void *)(ptrdiff_t)TT.vt_num);
a31d747b0017 Please find the patches attached herewith for adding 3 new commands -
Vivek Bhagat <vivek.bhagat89@gmail.com>
parents:
diff changeset
132 }
a31d747b0017 Please find the patches attached herewith for adding 3 new commands -
Vivek Bhagat <vivek.bhagat89@gmail.com>
parents:
diff changeset
133 }
a31d747b0017 Please find the patches attached herewith for adding 3 new commands -
Vivek Bhagat <vivek.bhagat89@gmail.com>
parents:
diff changeset
134 }