Annotation of /tags/mkinitrd-6_1_12/busybox/util-linux/script.c
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Revision 816 -
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Fri Apr 24 18:33:46 2009 UTC (15 years, 2 months ago) by niro
Original Path: trunk/mkinitrd-magellan/busybox/util-linux/script.c
File MIME type: text/plain
File size: 4956 byte(s)
Fri Apr 24 18:33:46 2009 UTC (15 years, 2 months ago) by niro
Original Path: trunk/mkinitrd-magellan/busybox/util-linux/script.c
File MIME type: text/plain
File size: 4956 byte(s)
-updated to busybox-1.13.4
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 | |||
14 | #include "libbb.h" | ||
15 | |||
16 | static smallint fd_count = 2; | ||
17 | |||
18 | static void handle_sigchld(int sig UNUSED_PARAM) | ||
19 | { | ||
20 | fd_count = 0; | ||
21 | } | ||
22 | |||
23 | int script_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; | ||
24 | int script_main(int argc UNUSED_PARAM, char **argv) | ||
25 | { | ||
26 | int opt; | ||
27 | int mode; | ||
28 | int child_pid; | ||
29 | int attr_ok; /* NB: 0: ok */ | ||
30 | int winsz_ok; | ||
31 | int pty; | ||
32 | char pty_line[GETPTY_BUFSIZE]; | ||
33 | struct termios tt, rtt; | ||
34 | struct winsize win; | ||
35 | const char *fname = "typescript"; | ||
36 | const char *shell; | ||
37 | char shell_opt[] = "-i"; | ||
38 | char *shell_arg = NULL; | ||
39 | |||
40 | #if ENABLE_GETOPT_LONG | ||
41 | static const char getopt_longopts[] ALIGN1 = | ||
42 | "append\0" No_argument "a" | ||
43 | "command\0" Required_argument "c" | ||
44 | "flush\0" No_argument "f" | ||
45 | "quiet\0" No_argument "q" | ||
46 | ; | ||
47 | |||
48 | applet_long_options = getopt_longopts; | ||
49 | #endif | ||
50 | opt_complementary = "?1"; /* max one arg */ | ||
51 | opt = getopt32(argv, "ac:fq", &shell_arg); | ||
52 | //argc -= optind; | ||
53 | argv += optind; | ||
54 | if (argv[0]) { | ||
55 | fname = argv[0]; | ||
56 | } | ||
57 | mode = O_CREAT|O_TRUNC|O_WRONLY; | ||
58 | if (opt & 1) { | ||
59 | mode = O_CREAT|O_APPEND|O_WRONLY; | ||
60 | } | ||
61 | if (opt & 2) { | ||
62 | shell_opt[1] = 'c'; | ||
63 | } | ||
64 | if (!(opt & 8)) { /* not -q */ | ||
65 | printf("Script started, file is %s\n", fname); | ||
66 | } | ||
67 | shell = getenv("SHELL"); | ||
68 | if (shell == NULL) { | ||
69 | shell = DEFAULT_SHELL; | ||
70 | } | ||
71 | |||
72 | pty = xgetpty(pty_line); | ||
73 | |||
74 | /* get current stdin's tty params */ | ||
75 | attr_ok = tcgetattr(0, &tt); | ||
76 | winsz_ok = ioctl(0, TIOCGWINSZ, (char *)&win); | ||
77 | |||
78 | rtt = tt; | ||
79 | cfmakeraw(&rtt); | ||
80 | rtt.c_lflag &= ~ECHO; | ||
81 | tcsetattr(0, TCSAFLUSH, &rtt); | ||
82 | |||
83 | /* "script" from util-linux exits when child exits, | ||
84 | * we wouldn't wait for EOF from slave pty | ||
85 | * (output may be produced by grandchildren of child) */ | ||
86 | signal(SIGCHLD, handle_sigchld); | ||
87 | |||
88 | /* TODO: SIGWINCH? pass window size changes down to slave? */ | ||
89 | |||
90 | child_pid = vfork(); | ||
91 | if (child_pid < 0) { | ||
92 | bb_perror_msg_and_die("vfork"); | ||
93 | } | ||
94 | |||
95 | if (child_pid) { | ||
96 | /* parent */ | ||
97 | #define buf bb_common_bufsiz1 | ||
98 | struct pollfd pfd[2]; | ||
99 | int outfd, count, loop; | ||
100 | |||
101 | outfd = xopen(fname, mode); | ||
102 | pfd[0].fd = pty; | ||
103 | pfd[0].events = POLLIN; | ||
104 | pfd[1].fd = 0; | ||
105 | pfd[1].events = POLLIN; | ||
106 | ndelay_on(pty); /* this descriptor is not shared, can do this */ | ||
107 | /* ndelay_on(0); - 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) { | ||
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 | full_write(STDOUT_FILENO, buf, count); | ||
128 | full_write(outfd, buf, count); | ||
129 | if (opt & 4) { /* -f */ | ||
130 | fsync(outfd); | ||
131 | } | ||
132 | } | ||
133 | } | ||
134 | if (pfd[1].revents) { | ||
135 | count = safe_read(STDIN_FILENO, buf, sizeof(buf)); | ||
136 | if (count <= 0) { | ||
137 | /* err/eof from stdin: don't read stdin anymore */ | ||
138 | pfd[1].revents = 0; | ||
139 | fd_count--; | ||
140 | } else { | ||
141 | full_write(pty, buf, count); | ||
142 | } | ||
143 | } | ||
144 | } | ||
145 | /* If loop was exited because SIGCHLD handler set fd_count to 0, | ||
146 | * there still can be some buffered output. But not loop forever: | ||
147 | * we won't pump orphaned grandchildren's output indefinitely. | ||
148 | * Testcase: running this in script: | ||
149 | * exec dd if=/dev/zero bs=1M count=1 | ||
150 | * must have "1+0 records in, 1+0 records out" captured too. | ||
151 | * (util-linux's script doesn't do this. buggy :) */ | ||
152 | loop = 999; | ||
153 | /* pty is in O_NONBLOCK mode, we exit as soon as buffer is empty */ | ||
154 | while (--loop && (count = safe_read(pty, buf, sizeof(buf))) > 0) { | ||
155 | full_write(STDOUT_FILENO, buf, count); | ||
156 | full_write(outfd, buf, count); | ||
157 | } | ||
158 | restore: | ||
159 | if (attr_ok == 0) | ||
160 | tcsetattr(0, TCSAFLUSH, &tt); | ||
161 | if (!(opt & 8)) /* not -q */ | ||
162 | printf("Script done, file is %s\n", fname); | ||
163 | return EXIT_SUCCESS; | ||
164 | } | ||
165 | |||
166 | /* child: make pty slave to be input, output, error; run shell */ | ||
167 | close(pty); /* close pty master */ | ||
168 | /* open pty slave to fd 0,1,2 */ | ||
169 | close(0); | ||
170 | xopen(pty_line, O_RDWR); /* uses fd 0 */ | ||
171 | xdup2(0, 1); | ||
172 | xdup2(0, 2); | ||
173 | /* copy our original stdin tty's parameters to pty */ | ||
174 | if (attr_ok == 0) | ||
175 | tcsetattr(0, TCSAFLUSH, &tt); | ||
176 | if (winsz_ok == 0) | ||
177 | ioctl(0, TIOCSWINSZ, (char *)&win); | ||
178 | /* set pty as a controlling tty */ | ||
179 | setsid(); | ||
180 | ioctl(0, TIOCSCTTY, 0 /* 0: don't forcibly steal */); | ||
181 | |||
182 | /* Non-ignored signals revert to SIG_DFL on exec anyway */ | ||
183 | /*signal(SIGCHLD, SIG_DFL);*/ | ||
184 | execl(shell, shell, shell_opt, shell_arg, NULL); | ||
185 | bb_simple_perror_msg_and_die(shell); | ||
186 | } |