blob: 8fb991d15f8a1b1038a1102bd4c4ee88c7a83580
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 | |
14 | //usage:#define script_trivial_usage |
15 | //usage: "[-afq" IF_SCRIPTREPLAY("t") "] [-c PROG] [OUTFILE]" |
16 | //usage:#define script_full_usage "\n\n" |
17 | //usage: " -a Append output" |
18 | //usage: "\n -c PROG Run PROG, not shell" |
19 | //usage: "\n -f Flush output after each write" |
20 | //usage: "\n -q Quiet" |
21 | //usage: IF_SCRIPTREPLAY( |
22 | //usage: "\n -t Send timing to stderr" |
23 | //usage: ) |
24 | |
25 | #include "libbb.h" |
26 | |
27 | int script_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
28 | int script_main(int argc UNUSED_PARAM, char **argv) |
29 | { |
30 | int opt; |
31 | int mode; |
32 | int child_pid; |
33 | int attr_ok; /* NB: 0: ok */ |
34 | int winsz_ok; |
35 | int pty; |
36 | char pty_line[GETPTY_BUFSIZE]; |
37 | struct termios tt, rtt; |
38 | struct winsize win; |
39 | const char *fname = "typescript"; |
40 | const char *shell; |
41 | char shell_opt[] = "-i"; |
42 | char *shell_arg = NULL; |
43 | enum { |
44 | OPT_a = (1 << 0), |
45 | OPT_c = (1 << 1), |
46 | OPT_f = (1 << 2), |
47 | OPT_q = (1 << 3), |
48 | OPT_t = (1 << 4), |
49 | }; |
50 | |
51 | #if ENABLE_LONG_OPTS |
52 | static const char getopt_longopts[] ALIGN1 = |
53 | "append\0" No_argument "a" |
54 | "command\0" Required_argument "c" |
55 | "flush\0" No_argument "f" |
56 | "quiet\0" No_argument "q" |
57 | IF_SCRIPTREPLAY("timing\0" No_argument "t") |
58 | ; |
59 | |
60 | applet_long_options = getopt_longopts; |
61 | #endif |
62 | |
63 | opt_complementary = "?1"; /* max one arg */ |
64 | opt = getopt32(argv, "ac:fq" IF_SCRIPTREPLAY("t") , &shell_arg); |
65 | //argc -= optind; |
66 | argv += optind; |
67 | if (argv[0]) { |
68 | fname = argv[0]; |
69 | } |
70 | mode = O_CREAT|O_TRUNC|O_WRONLY; |
71 | if (opt & OPT_a) { |
72 | mode = O_CREAT|O_APPEND|O_WRONLY; |
73 | } |
74 | if (opt & OPT_c) { |
75 | shell_opt[1] = 'c'; |
76 | } |
77 | if (!(opt & OPT_q)) { |
78 | printf("Script started, file is %s\n", fname); |
79 | } |
80 | shell = get_shell_name(); |
81 | |
82 | pty = xgetpty(pty_line); |
83 | |
84 | /* get current stdin's tty params */ |
85 | attr_ok = tcgetattr(0, &tt); |
86 | winsz_ok = ioctl(0, TIOCGWINSZ, (char *)&win); |
87 | |
88 | rtt = tt; |
89 | cfmakeraw(&rtt); |
90 | rtt.c_lflag &= ~ECHO; |
91 | tcsetattr(0, TCSAFLUSH, &rtt); |
92 | |
93 | /* "script" from util-linux exits when child exits, |
94 | * we wouldn't wait for EOF from slave pty |
95 | * (output may be produced by grandchildren of child) */ |
96 | signal(SIGCHLD, record_signo); |
97 | |
98 | /* TODO: SIGWINCH? pass window size changes down to slave? */ |
99 | |
100 | child_pid = xvfork(); |
101 | |
102 | if (child_pid) { |
103 | /* parent */ |
104 | #define buf bb_common_bufsiz1 |
105 | struct pollfd pfd[2]; |
106 | int outfd, count, loop; |
107 | double oldtime = ENABLE_SCRIPTREPLAY ? time(NULL) : 0; |
108 | smallint fd_count = 2; |
109 | |
110 | outfd = xopen(fname, mode); |
111 | pfd[0].fd = pty; |
112 | pfd[0].events = POLLIN; |
113 | pfd[1].fd = STDIN_FILENO; |
114 | pfd[1].events = POLLIN; |
115 | ndelay_on(pty); /* this descriptor is not shared, can do this */ |
116 | /* ndelay_on(STDIN_FILENO); - NO, stdin can be shared! Pity :( */ |
117 | |
118 | /* copy stdin to pty master input, |
119 | * copy pty master output to stdout and file */ |
120 | /* TODO: don't use full_write's, use proper write buffering */ |
121 | while (fd_count && !bb_got_signal) { |
122 | /* not safe_poll! we want SIGCHLD to EINTR poll */ |
123 | if (poll(pfd, fd_count, -1) < 0 && errno != EINTR) { |
124 | /* If child exits too quickly, we may get EIO: |
125 | * for example, try "script -c true" */ |
126 | break; |
127 | } |
128 | if (pfd[0].revents) { |
129 | errno = 0; |
130 | count = safe_read(pty, buf, sizeof(buf)); |
131 | if (count <= 0 && errno != EAGAIN) { |
132 | /* err/eof from pty: exit */ |
133 | goto restore; |
134 | } |
135 | if (count > 0) { |
136 | if (ENABLE_SCRIPTREPLAY && (opt & OPT_t)) { |
137 | struct timeval tv; |
138 | double newtime; |
139 | |
140 | gettimeofday(&tv, NULL); |
141 | newtime = tv.tv_sec + (double) tv.tv_usec / 1000000; |
142 | fprintf(stderr, "%f %u\n", newtime - oldtime, count); |
143 | oldtime = newtime; |
144 | } |
145 | full_write(STDOUT_FILENO, buf, count); |
146 | full_write(outfd, buf, count); |
147 | if (opt & OPT_f) { |
148 | fsync(outfd); |
149 | } |
150 | } |
151 | } |
152 | if (pfd[1].revents) { |
153 | count = safe_read(STDIN_FILENO, buf, sizeof(buf)); |
154 | if (count <= 0) { |
155 | /* err/eof from stdin: don't read stdin anymore */ |
156 | pfd[1].revents = 0; |
157 | fd_count--; |
158 | } else { |
159 | full_write(pty, buf, count); |
160 | } |
161 | } |
162 | } |
163 | /* If loop was exited because SIGCHLD handler set bb_got_signal, |
164 | * there still can be some buffered output. But dont loop forever: |
165 | * we won't pump orphaned grandchildren's output indefinitely. |
166 | * Testcase: running this in script: |
167 | * exec dd if=/dev/zero bs=1M count=1 |
168 | * must have "1+0 records in, 1+0 records out" captured too. |
169 | * (util-linux's script doesn't do this. buggy :) */ |
170 | loop = 999; |
171 | /* pty is in O_NONBLOCK mode, we exit as soon as buffer is empty */ |
172 | while (--loop && (count = safe_read(pty, buf, sizeof(buf))) > 0) { |
173 | full_write(STDOUT_FILENO, buf, count); |
174 | full_write(outfd, buf, count); |
175 | } |
176 | restore: |
177 | if (attr_ok == 0) |
178 | tcsetattr(0, TCSAFLUSH, &tt); |
179 | if (!(opt & OPT_q)) |
180 | printf("Script done, file is %s\n", fname); |
181 | return EXIT_SUCCESS; |
182 | } |
183 | |
184 | /* child: make pty slave to be input, output, error; run shell */ |
185 | close(pty); /* close pty master */ |
186 | /* open pty slave to fd 0,1,2 */ |
187 | close(0); |
188 | xopen(pty_line, O_RDWR); /* uses fd 0 */ |
189 | xdup2(0, 1); |
190 | xdup2(0, 2); |
191 | /* copy our original stdin tty's parameters to pty */ |
192 | if (attr_ok == 0) |
193 | tcsetattr(0, TCSAFLUSH, &tt); |
194 | if (winsz_ok == 0) |
195 | ioctl(0, TIOCSWINSZ, (char *)&win); |
196 | /* set pty as a controlling tty */ |
197 | setsid(); |
198 | ioctl(0, TIOCSCTTY, 0 /* 0: don't forcibly steal */); |
199 | |
200 | /* Non-ignored signals revert to SIG_DFL on exec anyway */ |
201 | /*signal(SIGCHLD, SIG_DFL);*/ |
202 | execl(shell, shell, shell_opt, shell_arg, (char *) NULL); |
203 | bb_simple_perror_msg_and_die(shell); |
204 | } |
205 |