scriptreplay: new applet. +423 bytes

Signed-off-by: Pascal Bellard <pascal.bellard@ads-lu.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

6 files changed, 95 insertions, 21 deletions

diff --git a/include/applets.h b/include/applets.h
index 359440def..7838757f5 100644
--- a/include/applets.h
+++ b/include/applets.h
@@ -326,6 +326,7 @@ IF_RUNSV(APPLET(runsv, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 IF_RUNSVDIR(APPLET(runsvdir, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 IF_RX(APPLET(rx, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 IF_SCRIPT(APPLET(script, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
+IF_SCRIPTREPLAY(APPLET(scriptreplay, _BB_DIR_BIN, _BB_SUID_NEVER))
 IF_SED(APPLET(sed, _BB_DIR_BIN, _BB_SUID_NEVER))
 IF_SELINUXENABLED(APPLET(selinuxenabled, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
 IF_SENDMAIL(APPLET(sendmail, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
diff --git a/include/usage.h b/include/usage.h
index 123462a02..1e327fb97 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -3512,6 +3512,11 @@
      "\n        -g      Process group id(s)" \
      "\n        -u      Process user name(s) and/or id(s)" \
 
+#define scriptreplay_trivial_usage \
+       "timingfile [typescript [divisor]]"
+#define scriptreplay_full_usage "\n\n" \
+       "Play back typescripts, using timing information"
+
 #define reset_trivial_usage \
        ""
 #define reset_full_usage "\n\n" \
@@ -3706,13 +3711,16 @@
        "$ rx /tmp/foo\n"
 
 #define script_trivial_usage \
-       "[-afq] [-c COMMAND] [OUTFILE]"
+       "[-afq" IF_SCRIPTREPLAY("t") "] [-c COMMAND] [OUTFILE]"
 #define script_full_usage "\n\n" \
        "Options:" \
      "\n        -a      Append output" \
      "\n        -c      Run COMMAND, not shell" \
      "\n        -f      Flush output after each write" \
      "\n        -q      Quiet" \
+        IF_SCRIPTREPLAY( \
+     "\n        -t      Send timing to stderr" \
+        )
 
 #define sed_trivial_usage \
        "[-efinr] pattern [files...]"
diff --git a/util-linux/Config.in b/util-linux/Config.in
index e5c053fcf..024550172 100644
--- a/util-linux/Config.in
+++ b/util-linux/Config.in
@@ -764,6 +764,13 @@ config SCRIPT
         help
           The script makes typescript of terminal session.
 
+config SCRIPTREPLAY
+        bool "scriptreplay"
+        default n
+        help
+          This program replays a typescript, using timing information
+          given by script -t.
+
 config SETARCH
         bool "setarch"
         default n
diff --git a/util-linux/Kbuild b/util-linux/Kbuild
index ac071c620..eaad3319d 100644
--- a/util-linux/Kbuild
+++ b/util-linux/Kbuild
@@ -33,6 +33,7 @@ lib-$(CONFIG_RDEV)              += rdev.o
 lib-$(CONFIG_READPROFILE)       += readprofile.o
 lib-$(CONFIG_RTCWAKE)           += rtcwake.o
 lib-$(CONFIG_SCRIPT)            += script.o
+lib-$(CONFIG_SCRIPTREPLAY)      += scriptreplay.o
 lib-$(CONFIG_SETARCH)           += setarch.o
 lib-$(CONFIG_SWAPONOFF)         += swaponoff.o
 lib-$(CONFIG_SWITCH_ROOT)       += switch_root.o
diff --git a/util-linux/script.c b/util-linux/script.c
index a9f24b10e..d16a2914a 100644
--- a/util-linux/script.c
+++ b/util-linux/script.c
@@ -10,16 +10,8 @@
  *
  * Licensed under GPLv2 or later, see file License in this tarball for details.
  */
-
 #include "libbb.h"
 
-static smallint fd_count = 2;
-
-static void handle_sigchld(int sig UNUSED_PARAM)
-{
-        fd_count = 0;
-}
-
 int script_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int script_main(int argc UNUSED_PARAM, char **argv)
 {
@@ -36,6 +28,15 @@ int script_main(int argc UNUSED_PARAM, char **argv)
         const char *shell;
         char shell_opt[] = "-i";
         char *shell_arg = NULL;
+        enum {
+                OPT_a = (1 << 0),
+                OPT_c = (1 << 1),
+                OPT_f = (1 << 2),
+                OPT_q = (1 << 3),
+#if ENABLE_SCRIPTREPLAY
+                OPT_t = (1 << 4),
+#endif
+        };
 
 #if ENABLE_GETOPT_LONG
         static const char getopt_longopts[] ALIGN1 =
@@ -43,25 +44,28 @@ int script_main(int argc UNUSED_PARAM, char **argv)
                 "command\0" Required_argument "c"
                 "flush\0"   No_argument       "f"
                 "quiet\0"   No_argument       "q"
+# if ENABLE_SCRIPTREPLAY
+                "timing\0"  No_argument       "t"
+# endif
                 ;
 
         applet_long_options = getopt_longopts;
 #endif
         opt_complementary = "?1"; /* max one arg */
-        opt = getopt32(argv, "ac:fq", &shell_arg);
+        opt = getopt32(argv, "ac:fq" IF_SCRIPTREPLAY("t") , &shell_arg);
         //argc -= optind;
         argv += optind;
         if (argv[0]) {
                 fname = argv[0];
         }
         mode = O_CREAT|O_TRUNC|O_WRONLY;
-        if (opt & 1) {
+        if (opt & OPT_a) {
                 mode = O_CREAT|O_APPEND|O_WRONLY;
         }
-        if (opt & 2) {
+        if (opt & OPT_c) {
                 shell_opt[1] = 'c';
         }
-        if (!(opt & 8)) { /* not -q */
+        if (!(opt & OPT_q)) {
                 printf("Script started, file is %s\n", fname);
         }
         shell = getenv("SHELL");
@@ -83,7 +87,7 @@ int script_main(int argc UNUSED_PARAM, char **argv)
         /* "script" from util-linux exits when child exits,
          * we wouldn't wait for EOF from slave pty
          * (output may be produced by grandchildren of child) */
-        signal(SIGCHLD, handle_sigchld);
+        signal(SIGCHLD, record_signo);
 
         /* TODO: SIGWINCH? pass window size changes down to slave? */
 
@@ -97,19 +101,23 @@ int script_main(int argc UNUSED_PARAM, char **argv)
 #define buf bb_common_bufsiz1
                 struct pollfd pfd[2];
                 int outfd, count, loop;
+#if ENABLE_SCRIPTREPLAY
+                double oldtime = time(NULL);
+#endif
+                smallint fd_count = 2;
 
                 outfd = xopen(fname, mode);
                 pfd[0].fd = pty;
                 pfd[0].events = POLLIN;
-                pfd[1].fd = 0;
+                pfd[1].fd = STDIN_FILENO;
                 pfd[1].events = POLLIN;
                 ndelay_on(pty); /* this descriptor is not shared, can do this */
-                /* ndelay_on(0); - NO, stdin can be shared! Pity :( */
+                /* ndelay_on(STDIN_FILENO); - NO, stdin can be shared! Pity :( */
 
                 /* copy stdin to pty master input,
                  * copy pty master output to stdout and file */
                 /* TODO: don't use full_write's, use proper write buffering */
-                while (fd_count) {
+                while (fd_count && !bb_got_signal) {
                         /* not safe_poll! we want SIGCHLD to EINTR poll */
                         if (poll(pfd, fd_count, -1) < 0 && errno != EINTR) {
                                 /* If child exits too quickly, we may get EIO:
@@ -124,9 +132,20 @@ int script_main(int argc UNUSED_PARAM, char **argv)
                                         goto restore;
                                 }
                                 if (count > 0) {
+#if ENABLE_SCRIPTREPLAY
+                                        if (opt & OPT_t) {
+                                                struct timeval tv;
+                                                double newtime;
+
+                                                gettimeofday(&tv, NULL);
+                                                newtime = tv.tv_sec + (double) tv.tv_usec / 1000000;
+                                                fprintf(stderr, "%f %u\n", newtime - oldtime, count);
+                                                oldtime = newtime;
+                                        }
+#endif
                                         full_write(STDOUT_FILENO, buf, count);
                                         full_write(outfd, buf, count);
-                                        if (opt & 4) { /* -f */
+                                        if (opt & OPT_f) {
                                                 fsync(outfd);
                                         }
                                 }
@@ -142,8 +161,8 @@ int script_main(int argc UNUSED_PARAM, char **argv)
                                 }
                         }
                 }
-                /* If loop was exited because SIGCHLD handler set fd_count to 0,
-                 * there still can be some buffered output. But not loop forever:
+                /* If loop was exited because SIGCHLD handler set bb_got_signal,
+                 * there still can be some buffered output. But dont loop forever:
                  * we won't pump orphaned grandchildren's output indefinitely.
                  * Testcase: running this in script:
                  *      exec dd if=/dev/zero bs=1M count=1
@@ -158,7 +177,7 @@ int script_main(int argc UNUSED_PARAM, char **argv)
  restore:
                 if (attr_ok == 0)
                         tcsetattr(0, TCSAFLUSH, &tt);
-                if (!(opt & 8)) /* not -q */
+                if (!(opt & OPT_q))
                         printf("Script done, file is %s\n", fname);
                 return EXIT_SUCCESS;
         }
diff --git a/util-linux/scriptreplay.c b/util-linux/scriptreplay.c
new file mode 100644
index 000000000..038dbdfe1
--- /dev/null
+++ b/util-linux/scriptreplay.c
@@ -0,0 +1,38 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * scriptreplay - play back typescripts, using timing information
+ *
+ * pascal.bellard@ads-lu.com
+ *
+ * Licensed under GPLv2 or later, see file License in this tarball for details.
+ *
+ */
+#include "libbb.h"
+
+int scriptreplay_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int scriptreplay_main(int argc UNUSED_PARAM, char **argv)
+{
+        const char *script = "typescript";
+        double delay, factor = 1000000.0;
+        int fd;
+        unsigned long count;
+        FILE *tfp;
+
+        if (argv[2]) {
+                script = argv[2];
+                if (argv[3])
+                        factor /= atof(argv[3]);
+        }
+
+        tfp = xfopen_for_read(argv[1]);
+        fd = xopen(script, O_RDONLY);
+        while (fscanf(tfp, "%lf %lu\n", &delay, &count) == 2) {
+                usleep(delay * factor);
+                bb_copyfd_exact_size(fd, STDOUT_FILENO, count);
+        }
+#if ENABLE_FEATURE_CLEAN_UP
+        close(fd);
+        fclose(tfp);
+#endif
+        return EXIT_SUCCESS;
+}