Annotation of /trunk/mkinitrd-magellan/busybox/util-linux/script.c
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Revision 984 -
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Sun May 30 11:32:42 2010 UTC (14 years ago) by niro
File MIME type: text/plain
File size: 5428 byte(s)
Sun May 30 11:32:42 2010 UTC (14 years ago) by niro
File MIME type: text/plain
File size: 5428 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
1 | niro | 816 | /* 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 | niro | 984 | 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 | niro | 816 | |
39 | niro | 984 | #if ENABLE_LONG_OPTS |
40 | niro | 816 | 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 | niro | 984 | IF_SCRIPTREPLAY("timing\0" No_argument "t") |
46 | niro | 816 | ; |
47 | |||
48 | applet_long_options = getopt_longopts; | ||
49 | #endif | ||
50 | niro | 984 | |
51 | niro | 816 | opt_complementary = "?1"; /* max one arg */ |
52 | niro | 984 | opt = getopt32(argv, "ac:fq" IF_SCRIPTREPLAY("t") , &shell_arg); |
53 | niro | 816 | //argc -= optind; |
54 | argv += optind; | ||
55 | if (argv[0]) { | ||
56 | fname = argv[0]; | ||
57 | } | ||
58 | mode = O_CREAT|O_TRUNC|O_WRONLY; | ||
59 | niro | 984 | if (opt & OPT_a) { |
60 | niro | 816 | mode = O_CREAT|O_APPEND|O_WRONLY; |
61 | } | ||
62 | niro | 984 | if (opt & OPT_c) { |
63 | niro | 816 | shell_opt[1] = 'c'; |
64 | } | ||
65 | niro | 984 | if (!(opt & OPT_q)) { |
66 | niro | 816 | 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 | niro | 984 | signal(SIGCHLD, record_signo); |
88 | niro | 816 | |
89 | /* TODO: SIGWINCH? pass window size changes down to slave? */ | ||
90 | |||
91 | child_pid = vfork(); | ||
92 | if (child_pid < 0) { | ||
93 | bb_perror_msg_and_die("vfork"); | ||
94 | } | ||
95 | |||
96 | if (child_pid) { | ||
97 | /* parent */ | ||
98 | #define buf bb_common_bufsiz1 | ||
99 | struct pollfd pfd[2]; | ||
100 | int outfd, count, loop; | ||
101 | niro | 984 | double oldtime = ENABLE_SCRIPTREPLAY ? time(NULL) : 0; |
102 | smallint fd_count = 2; | ||
103 | niro | 816 | |
104 | outfd = xopen(fname, mode); | ||
105 | pfd[0].fd = pty; | ||
106 | pfd[0].events = POLLIN; | ||
107 | niro | 984 | pfd[1].fd = STDIN_FILENO; |
108 | niro | 816 | pfd[1].events = POLLIN; |
109 | ndelay_on(pty); /* this descriptor is not shared, can do this */ | ||
110 | niro | 984 | /* ndelay_on(STDIN_FILENO); - NO, stdin can be shared! Pity :( */ |
111 | niro | 816 | |
112 | /* copy stdin to pty master input, | ||
113 | * copy pty master output to stdout and file */ | ||
114 | /* TODO: don't use full_write's, use proper write buffering */ | ||
115 | niro | 984 | while (fd_count && !bb_got_signal) { |
116 | niro | 816 | /* not safe_poll! we want SIGCHLD to EINTR poll */ |
117 | if (poll(pfd, fd_count, -1) < 0 && errno != EINTR) { | ||
118 | /* If child exits too quickly, we may get EIO: | ||
119 | * for example, try "script -c true" */ | ||
120 | break; | ||
121 | } | ||
122 | if (pfd[0].revents) { | ||
123 | errno = 0; | ||
124 | count = safe_read(pty, buf, sizeof(buf)); | ||
125 | if (count <= 0 && errno != EAGAIN) { | ||
126 | /* err/eof from pty: exit */ | ||
127 | goto restore; | ||
128 | } | ||
129 | if (count > 0) { | ||
130 | niro | 984 | if (ENABLE_SCRIPTREPLAY && (opt & OPT_t)) { |
131 | struct timeval tv; | ||
132 | double newtime; | ||
133 | |||
134 | gettimeofday(&tv, NULL); | ||
135 | newtime = tv.tv_sec + (double) tv.tv_usec / 1000000; | ||
136 | fprintf(stderr, "%f %u\n", newtime - oldtime, count); | ||
137 | oldtime = newtime; | ||
138 | } | ||
139 | niro | 816 | full_write(STDOUT_FILENO, buf, count); |
140 | full_write(outfd, buf, count); | ||
141 | niro | 984 | if (opt & OPT_f) { |
142 | niro | 816 | fsync(outfd); |
143 | } | ||
144 | } | ||
145 | } | ||
146 | if (pfd[1].revents) { | ||
147 | count = safe_read(STDIN_FILENO, buf, sizeof(buf)); | ||
148 | if (count <= 0) { | ||
149 | /* err/eof from stdin: don't read stdin anymore */ | ||
150 | pfd[1].revents = 0; | ||
151 | fd_count--; | ||
152 | } else { | ||
153 | full_write(pty, buf, count); | ||
154 | } | ||
155 | } | ||
156 | } | ||
157 | niro | 984 | /* If loop was exited because SIGCHLD handler set bb_got_signal, |
158 | * there still can be some buffered output. But dont loop forever: | ||
159 | niro | 816 | * we won't pump orphaned grandchildren's output indefinitely. |
160 | * Testcase: running this in script: | ||
161 | * exec dd if=/dev/zero bs=1M count=1 | ||
162 | * must have "1+0 records in, 1+0 records out" captured too. | ||
163 | * (util-linux's script doesn't do this. buggy :) */ | ||
164 | loop = 999; | ||
165 | /* pty is in O_NONBLOCK mode, we exit as soon as buffer is empty */ | ||
166 | while (--loop && (count = safe_read(pty, buf, sizeof(buf))) > 0) { | ||
167 | full_write(STDOUT_FILENO, buf, count); | ||
168 | full_write(outfd, buf, count); | ||
169 | } | ||
170 | restore: | ||
171 | if (attr_ok == 0) | ||
172 | tcsetattr(0, TCSAFLUSH, &tt); | ||
173 | niro | 984 | if (!(opt & OPT_q)) |
174 | niro | 816 | printf("Script done, file is %s\n", fname); |
175 | return EXIT_SUCCESS; | ||
176 | } | ||
177 | |||
178 | /* child: make pty slave to be input, output, error; run shell */ | ||
179 | close(pty); /* close pty master */ | ||
180 | /* open pty slave to fd 0,1,2 */ | ||
181 | close(0); | ||
182 | xopen(pty_line, O_RDWR); /* uses fd 0 */ | ||
183 | xdup2(0, 1); | ||
184 | xdup2(0, 2); | ||
185 | /* copy our original stdin tty's parameters to pty */ | ||
186 | if (attr_ok == 0) | ||
187 | tcsetattr(0, TCSAFLUSH, &tt); | ||
188 | if (winsz_ok == 0) | ||
189 | ioctl(0, TIOCSWINSZ, (char *)&win); | ||
190 | /* set pty as a controlling tty */ | ||
191 | setsid(); | ||
192 | ioctl(0, TIOCSCTTY, 0 /* 0: don't forcibly steal */); | ||
193 | |||
194 | /* Non-ignored signals revert to SIG_DFL on exec anyway */ | ||
195 | /*signal(SIGCHLD, SIG_DFL);*/ | ||
196 | niro | 984 | execl(shell, shell, shell_opt, shell_arg, (char *) NULL); |
197 | niro | 816 | bb_simple_perror_msg_and_die(shell); |
198 | } |