source: MondoRescue/branches/2.2.9/mindi-busybox/util-linux/script.c@ 2725

Last change on this file since 2725 was 2725, checked in by Bruno Cornec, 13 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
  • Property svn:eol-style set to native
File size: 5.2 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * script implementation for busybox
4 *
5 * pascal.bellard@ads-lu.com
6 *
7 * Based on code from util-linux v 2.12r
8 * Copyright (c) 1980
9 * The Regents of the University of California. All rights reserved.
10 *
11 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
12 */
13#include "libbb.h"
14
15int script_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
16int script_main(int argc UNUSED_PARAM, char **argv)
17{
18 int opt;
19 int mode;
20 int child_pid;
21 int attr_ok; /* NB: 0: ok */
22 int winsz_ok;
23 int pty;
24 char pty_line[GETPTY_BUFSIZE];
25 struct termios tt, rtt;
26 struct winsize win;
27 const char *fname = "typescript";
28 const char *shell;
29 char shell_opt[] = "-i";
30 char *shell_arg = NULL;
31 enum {
32 OPT_a = (1 << 0),
33 OPT_c = (1 << 1),
34 OPT_f = (1 << 2),
35 OPT_q = (1 << 3),
36 OPT_t = (1 << 4),
37 };
38
39#if ENABLE_LONG_OPTS
40 static const char getopt_longopts[] ALIGN1 =
41 "append\0" No_argument "a"
42 "command\0" Required_argument "c"
43 "flush\0" No_argument "f"
44 "quiet\0" No_argument "q"
45 IF_SCRIPTREPLAY("timing\0" No_argument "t")
46 ;
47
48 applet_long_options = getopt_longopts;
49#endif
50
51 opt_complementary = "?1"; /* max one arg */
52 opt = getopt32(argv, "ac:fq" IF_SCRIPTREPLAY("t") , &shell_arg);
53 //argc -= optind;
54 argv += optind;
55 if (argv[0]) {
56 fname = argv[0];
57 }
58 mode = O_CREAT|O_TRUNC|O_WRONLY;
59 if (opt & OPT_a) {
60 mode = O_CREAT|O_APPEND|O_WRONLY;
61 }
62 if (opt & OPT_c) {
63 shell_opt[1] = 'c';
64 }
65 if (!(opt & OPT_q)) {
66 printf("Script started, file is %s\n", fname);
67 }
68 shell = getenv("SHELL");
69 if (shell == NULL) {
70 shell = DEFAULT_SHELL;
71 }
72
73 pty = xgetpty(pty_line);
74
75 /* get current stdin's tty params */
76 attr_ok = tcgetattr(0, &tt);
77 winsz_ok = ioctl(0, TIOCGWINSZ, (char *)&win);
78
79 rtt = tt;
80 cfmakeraw(&rtt);
81 rtt.c_lflag &= ~ECHO;
82 tcsetattr(0, TCSAFLUSH, &rtt);
83
84 /* "script" from util-linux exits when child exits,
85 * we wouldn't wait for EOF from slave pty
86 * (output may be produced by grandchildren of child) */
87 signal(SIGCHLD, record_signo);
88
89 /* TODO: SIGWINCH? pass window size changes down to slave? */
90
91 child_pid = xvfork();
92
93 if (child_pid) {
94 /* parent */
95#define buf bb_common_bufsiz1
96 struct pollfd pfd[2];
97 int outfd, count, loop;
98 double oldtime = ENABLE_SCRIPTREPLAY ? time(NULL) : 0;
99 smallint fd_count = 2;
100
101 outfd = xopen(fname, mode);
102 pfd[0].fd = pty;
103 pfd[0].events = POLLIN;
104 pfd[1].fd = STDIN_FILENO;
105 pfd[1].events = POLLIN;
106 ndelay_on(pty); /* this descriptor is not shared, can do this */
107 /* ndelay_on(STDIN_FILENO); - NO, stdin can be shared! Pity :( */
108
109 /* copy stdin to pty master input,
110 * copy pty master output to stdout and file */
111 /* TODO: don't use full_write's, use proper write buffering */
112 while (fd_count && !bb_got_signal) {
113 /* not safe_poll! we want SIGCHLD to EINTR poll */
114 if (poll(pfd, fd_count, -1) < 0 && errno != EINTR) {
115 /* If child exits too quickly, we may get EIO:
116 * for example, try "script -c true" */
117 break;
118 }
119 if (pfd[0].revents) {
120 errno = 0;
121 count = safe_read(pty, buf, sizeof(buf));
122 if (count <= 0 && errno != EAGAIN) {
123 /* err/eof from pty: exit */
124 goto restore;
125 }
126 if (count > 0) {
127 if (ENABLE_SCRIPTREPLAY && (opt & OPT_t)) {
128 struct timeval tv;
129 double newtime;
130
131 gettimeofday(&tv, NULL);
132 newtime = tv.tv_sec + (double) tv.tv_usec / 1000000;
133 fprintf(stderr, "%f %u\n", newtime - oldtime, count);
134 oldtime = newtime;
135 }
136 full_write(STDOUT_FILENO, buf, count);
137 full_write(outfd, buf, count);
138 if (opt & OPT_f) {
139 fsync(outfd);
140 }
141 }
142 }
143 if (pfd[1].revents) {
144 count = safe_read(STDIN_FILENO, buf, sizeof(buf));
145 if (count <= 0) {
146 /* err/eof from stdin: don't read stdin anymore */
147 pfd[1].revents = 0;
148 fd_count--;
149 } else {
150 full_write(pty, buf, count);
151 }
152 }
153 }
154 /* If loop was exited because SIGCHLD handler set bb_got_signal,
155 * there still can be some buffered output. But dont loop forever:
156 * we won't pump orphaned grandchildren's output indefinitely.
157 * Testcase: running this in script:
158 * exec dd if=/dev/zero bs=1M count=1
159 * must have "1+0 records in, 1+0 records out" captured too.
160 * (util-linux's script doesn't do this. buggy :) */
161 loop = 999;
162 /* pty is in O_NONBLOCK mode, we exit as soon as buffer is empty */
163 while (--loop && (count = safe_read(pty, buf, sizeof(buf))) > 0) {
164 full_write(STDOUT_FILENO, buf, count);
165 full_write(outfd, buf, count);
166 }
167 restore:
168 if (attr_ok == 0)
169 tcsetattr(0, TCSAFLUSH, &tt);
170 if (!(opt & OPT_q))
171 printf("Script done, file is %s\n", fname);
172 return EXIT_SUCCESS;
173 }
174
175 /* child: make pty slave to be input, output, error; run shell */
176 close(pty); /* close pty master */
177 /* open pty slave to fd 0,1,2 */
178 close(0);
179 xopen(pty_line, O_RDWR); /* uses fd 0 */
180 xdup2(0, 1);
181 xdup2(0, 2);
182 /* copy our original stdin tty's parameters to pty */
183 if (attr_ok == 0)
184 tcsetattr(0, TCSAFLUSH, &tt);
185 if (winsz_ok == 0)
186 ioctl(0, TIOCSWINSZ, (char *)&win);
187 /* set pty as a controlling tty */
188 setsid();
189 ioctl(0, TIOCSCTTY, 0 /* 0: don't forcibly steal */);
190
191 /* Non-ignored signals revert to SIG_DFL on exec anyway */
192 /*signal(SIGCHLD, SIG_DFL);*/
193 execl(shell, shell, shell_opt, shell_arg, (char *) NULL);
194 bb_simple_perror_msg_and_die(shell);
195}
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