mirror of
https://git.busybox.net/busybox.git
synced 2024-11-23 21:53:25 +08:00
3c13da3dab
function old new delta xgettimeofday - 11 +11 get_local_var_value 280 281 +1 svlogd_main 1323 1322 -1 change_epoch 67 66 -1 timestamp_and_log 461 458 -3 hwclock_main 301 298 -3 fmt_time_bernstein_25 135 132 -3 step_time 331 326 -5 script_main 1207 1202 -5 machtime 34 28 -6 curtime 61 54 -7 ts_main 423 415 -8 nmeter_main 761 751 -10 gettime1900d 67 46 -21 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 1/12 up/down: 12/-73) Total: -61 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
241 lines
6.6 KiB
C
241 lines
6.6 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* script implementation for busybox
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*
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* pascal.bellard@ads-lu.com
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*
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* Based on code from util-linux v 2.12r
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* Copyright (c) 1980
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* The Regents of the University of California. All rights reserved.
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config SCRIPT
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//config: bool "script (8.6 kb)"
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//config: default y
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//config: help
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//config: The script makes typescript of terminal session.
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//applet:IF_SCRIPT(APPLET(script, BB_DIR_USR_BIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_SCRIPT) += script.o
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//usage:#define script_trivial_usage
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//usage: "[-afq] [-t[FILE]] [-c PROG] [OUTFILE]"
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//usage:#define script_full_usage "\n\n"
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//usage: "Default OUTFILE is 'typescript'"
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//usage: "\n"
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//usage: "\n -a Append output"
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//usage: "\n -c PROG Run PROG, not shell"
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/* Accepted but has no effect (we never buffer output) */
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/*//usage: "\n -f Flush output after each write"*/
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//usage: "\n -q Quiet"
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//usage: "\n -t[FILE] Send timing to stderr or FILE"
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//util-linux-2.28:
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//-e: return exit code of the child
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//FYI (reported as bbox bug #2749):
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// > script -q -c 'echo -e -n "1\n2\n3\n"' /dev/null </dev/null >123.txt
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// > The output file on full-blown ubuntu system contains 6 bytes.
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// > Output on Busybox system (arm-linux) contains extra '\r' byte in each line.
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//however, in my test, "script" from util-linux-2.28 seems to also add '\r' bytes.
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#include "libbb.h"
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#include "common_bufsiz.h"
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int script_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int script_main(int argc UNUSED_PARAM, char **argv)
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{
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int opt;
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int mode;
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int child_pid;
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int attr_ok; /* NB: 0: ok */
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int winsz_ok;
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int pty;
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char pty_line[GETPTY_BUFSIZE];
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struct termios tt, rtt;
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struct winsize win;
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FILE *timing_fp;
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const char *str_t = NULL;
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const char *fname = "typescript";
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const char *shell;
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char shell_opt[] = "-i";
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char *shell_arg = NULL;
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enum {
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OPT_a = (1 << 0),
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OPT_c = (1 << 1),
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OPT_f = (1 << 2),
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OPT_q = (1 << 3),
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OPT_t = (1 << 4),
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};
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#if ENABLE_LONG_OPTS
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static const char script_longopts[] ALIGN1 =
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"append\0" No_argument "a"
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"command\0" Required_argument "c"
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"flush\0" No_argument "f"
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"quiet\0" No_argument "q"
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"timing\0" Optional_argument "t"
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;
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#endif
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opt = getopt32long(argv, "^" "ac:fqt::" "\0" "?1"/* max one arg */,
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script_longopts,
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&shell_arg, &str_t
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);
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//argc -= optind;
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argv += optind;
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if (argv[0]) {
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fname = argv[0];
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}
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mode = O_CREAT|O_TRUNC|O_WRONLY;
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if (opt & OPT_a) {
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mode = O_CREAT|O_APPEND|O_WRONLY;
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}
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if (opt & OPT_c) {
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shell_opt[1] = 'c';
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}
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if (!(opt & OPT_q)) {
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printf("Script started, file is %s\n", fname);
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}
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timing_fp = stderr;
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if (str_t) {
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timing_fp = xfopen_for_write(str_t);
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}
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shell = get_shell_name();
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/* Some people run "script ... 0>&-".
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* Our code assumes that STDIN_FILENO != pty.
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* Ensure STDIN_FILENO is not closed:
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*/
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bb_sanitize_stdio();
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pty = xgetpty(pty_line);
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/* get current stdin's tty params */
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attr_ok = tcgetattr(0, &tt);
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winsz_ok = ioctl(0, TIOCGWINSZ, (char *)&win);
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rtt = tt;
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cfmakeraw(&rtt);
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rtt.c_lflag &= ~ECHO;
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tcsetattr(0, TCSAFLUSH, &rtt);
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/* "script" from util-linux exits when child exits,
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* we wouldn't wait for EOF from slave pty
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* (output may be produced by grandchildren of child) */
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signal(SIGCHLD, record_signo);
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/* TODO: SIGWINCH? pass window size changes down to slave? */
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child_pid = xvfork();
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if (child_pid) {
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/* parent */
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struct pollfd pfd[2];
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int outfd, count, loop;
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double oldtime = time(NULL);
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smallint fd_count = 2;
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#define buf bb_common_bufsiz1
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setup_common_bufsiz();
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outfd = xopen(fname, mode);
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pfd[0].fd = pty;
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pfd[0].events = POLLIN;
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pfd[1].fd = STDIN_FILENO;
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pfd[1].events = POLLIN;
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ndelay_on(pty); /* this descriptor is not shared, can do this */
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/* ndelay_on(STDIN_FILENO); - NO, stdin can be shared! Pity :( */
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/* copy stdin to pty master input,
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* copy pty master output to stdout and file */
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/* TODO: don't use full_write's, use proper write buffering */
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while (fd_count && !bb_got_signal) {
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/* not safe_poll! we want SIGCHLD to EINTR poll */
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if (poll(pfd, fd_count, -1) < 0 && errno != EINTR) {
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/* If child exits too quickly, we may get EIO:
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* for example, try "script -c true" */
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break;
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}
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if (pfd[0].revents) {
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errno = 0;
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count = safe_read(pty, buf, COMMON_BUFSIZE);
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if (count <= 0 && errno != EAGAIN) {
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/* err/eof from pty: exit */
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goto restore;
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}
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if (count > 0) {
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if (opt & OPT_t) {
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struct timeval tv;
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double newtime;
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xgettimeofday(&tv);
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newtime = tv.tv_sec + (double) tv.tv_usec / 1000000;
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fprintf(timing_fp, "%f %u\n", newtime - oldtime, count);
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oldtime = newtime;
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}
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full_write(STDOUT_FILENO, buf, count);
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full_write(outfd, buf, count);
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// If we'd be using (buffered) FILE i/o, we'd need this:
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//if (opt & OPT_f) {
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// fflush(outfd);
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//}
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}
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}
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if (pfd[1].revents) {
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count = safe_read(STDIN_FILENO, buf, COMMON_BUFSIZE);
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if (count <= 0) {
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/* err/eof from stdin: don't read stdin anymore */
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pfd[1].revents = 0;
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fd_count--;
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} else {
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full_write(pty, buf, count);
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}
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}
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}
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/* If loop was exited because SIGCHLD handler set bb_got_signal,
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* there still can be some buffered output. But dont loop forever:
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* we won't pump orphaned grandchildren's output indefinitely.
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* Testcase: running this in script:
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* exec dd if=/dev/zero bs=1M count=1
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* must have "1+0 records in, 1+0 records out" captured too.
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* (util-linux's script doesn't do this. buggy :) */
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loop = 999;
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/* pty is in O_NONBLOCK mode, we exit as soon as buffer is empty */
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while (--loop && (count = safe_read(pty, buf, COMMON_BUFSIZE)) > 0) {
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full_write(STDOUT_FILENO, buf, count);
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full_write(outfd, buf, count);
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}
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restore:
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if (attr_ok == 0)
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tcsetattr(0, TCSAFLUSH, &tt);
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if (!(opt & OPT_q))
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printf("Script done, file is %s\n", fname);
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return EXIT_SUCCESS;
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}
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/* child: make pty slave to be input, output, error; run shell */
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close(pty); /* close pty master */
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/* open pty slave to fd 0,1,2 */
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close(0);
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xopen(pty_line, O_RDWR); /* uses fd 0 */
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xdup2(0, 1);
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xdup2(0, 2);
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/* copy our original stdin tty's parameters to pty */
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if (attr_ok == 0)
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tcsetattr(0, TCSAFLUSH, &tt);
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if (winsz_ok == 0)
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ioctl(0, TIOCSWINSZ, (char *)&win);
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/* set pty as a controlling tty */
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setsid();
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ioctl(0, TIOCSCTTY, 0 /* 0: don't forcibly steal */);
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/* Non-ignored signals revert to SIG_DFL on exec anyway */
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/*signal(SIGCHLD, SIG_DFL);*/
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execl(shell, shell, shell_opt, shell_arg, (char *) NULL);
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bb_simple_perror_msg_and_die(shell);
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}
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