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annotate toys/pending/openvt.c @ 1215:4eaac3e63fa7 draft

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Cleanup freeramdisk: tabs to 2 spaces, square brackets for option name, do optional cleanup under if (CFG_TOYBOX_FREE) guard.
author Rob Landley <rob@landley.net>
date Sun, 09 Mar 2014 14:38:51 -0500
parents a31d747b0017
children 3c855d5a75be
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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) {
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125 while (-1 == waitpid(pid, NULL, 0) && errno == EINTR)
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126 ;
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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 }