Contents of /trunk/mkinitrd-magellan/busybox/util-linux/script.c
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Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
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Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
File MIME type: text/plain
File size: 5370 byte(s)
-updated to busybox-1.17.1
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 tarball for details. |
12 | */ |
13 | #include "libbb.h" |
14 | |
15 | int script_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
16 | int 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 | } |