hexedit: new applet

[oweals/busybox.git] / miscutils / time.c

diff --git a/miscutils/time.c b/miscutils/time.c
index 5cfbcef8ef64202e28166f5265e49aeec64c0750..65dbcdcf31ae0edc835a614441b061649430ed22 100644 (file)
--- a/miscutils/time.c
+++ b/miscutils/time.c
@@ -2,14 +2,36 @@
 /* 'time' utility to display resource usage of processes.
    Copyright (C) 1990, 91, 92, 93, 96 Free Software Foundation, Inc.
 
-   Licensed under GPL version 2, see file LICENSE in this tarball for details.
+   Licensed under GPLv2, see file LICENSE in this source tree.
 */
 /* Originally written by David Keppel <pardo@cs.washington.edu>.
    Heavily modified by David MacKenzie <djm@gnu.ai.mit.edu>.
    Heavily modified for busybox by Erik Andersen <andersen@codepoet.org>
 */
+//config:config TIME
+//config:      bool "time (7 kb)"
+//config:      default y
+//config:      help
+//config:      The time command runs the specified program with the given arguments.
+//config:      When the command finishes, time writes a message to standard output
+//config:      giving timing statistics about this program run.
+
+//applet:IF_TIME(APPLET(time, BB_DIR_USR_BIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_TIME) += time.o
+
+//usage:#define time_trivial_usage
+//usage:       "[-vpa] [-o FILE] PROG ARGS"
+//usage:#define time_full_usage "\n\n"
+//usage:       "Run PROG, display resource usage when it exits\n"
+//usage:     "\n       -v      Verbose"
+//usage:     "\n       -p      POSIX output format"
+//usage:     "\n       -f FMT  Custom format"
+//usage:     "\n       -o FILE Write result to FILE"
+//usage:     "\n       -a      Append (else overwrite)"
 
 #include "libbb.h"
+#include <sys/resource.h> /* getrusage */
 
 /* Information on the resources used by a child process.  */
 typedef struct {
@@ -63,7 +85,7 @@ static void resuse_end(pid_t pid, resource_t *resp)
        pid_t caught;
 
        /* Ignore signals, but don't ignore the children.  When wait3
-          returns the child process, set the time the command finished. */
+        * returns the child process, set the time the command finished. */
        while ((caught = wait3(&resp->waitstatus, 0, &resp->ru)) != pid) {
                if (caught == -1 && errno != EINTR) {
                        bb_perror_msg("wait");
@@ -105,13 +127,13 @@ static unsigned long ptok(const unsigned pagesize, const unsigned long pages)
 
 /* summarize: Report on the system use of a command.
 
-   Print the FMT argument except that `%' sequences
-   have special meaning, and `\n' and `\t' are translated into
-   newline and tab, respectively, and `\\' is translated into `\'.
+   Print the FMT argument except that '%' sequences
+   have special meaning, and '\n' and '\t' are translated into
+   newline and tab, respectively, and '\\' is translated into '\'.
 
-   The character following a `%' can be:
+   The character following a '%' can be:
    (* means the tcsh time builtin also recognizes it)
-   % == a literal `%'
+   % == a literal '%'
    C == command name and arguments
 *  D == average unshared data size in K (ru_idrss+ru_isrss)
 *  E == elapsed real (wall clock) time in [hour:]min:sec
@@ -372,16 +394,14 @@ static void run_command(char *const *cmd, resource_t *resp)
        void (*quit_signal)(int);
 
        resp->elapsed_ms = monotonic_ms();
-       pid = vfork();
-       if (pid < 0)
-               bb_perror_msg_and_die("vfork");
+       pid = xvfork();
        if (pid == 0) {
                /* Child */
                BB_EXECVP_or_die((char**)cmd);
        }
 
        /* Have signals kill the child but not self (if possible).  */
-//TODO: just block all sigs? and reenable them in the very end in main?
+//TODO: just block all sigs? and re-enable them in the very end in main?
        interrupt_signal = signal(SIGINT, SIG_IGN);
        quit_signal = signal(SIGQUIT, SIG_IGN);
 
@@ -396,29 +416,51 @@ int time_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int time_main(int argc UNUSED_PARAM, char **argv)
 {
        resource_t res;
-       const char *output_format = default_format;
+       /* $TIME has lowest prio (-v,-p,-f FMT overrride it) */
+       const char *output_format = getenv("TIME") ? : default_format;
+       char *output_filename;
+       int output_fd;
        int opt;
+       int ex;
+       enum {
+               OPT_v = (1 << 0),
+               OPT_p = (1 << 1),
+               OPT_a = (1 << 2),
+               OPT_o = (1 << 3),
+               OPT_f = (1 << 4),
+       };
 
-       opt_complementary = "-1"; /* at least one arg */
        /* "+": stop on first non-option */
-       opt = getopt32(argv, "+vp");
+       opt = getopt32(argv, "^+" "vpao:f:" "\0" "-1"/*at least one arg*/,
+                               &output_filename, &output_format
+       );
        argv += optind;
-       if (opt & 1)
+       if (opt & OPT_v)
                output_format = long_format;
-       if (opt & 2)
+       if (opt & OPT_p)
                output_format = posix_format;
+       output_fd = STDERR_FILENO;
+       if (opt & OPT_o) {
+               output_fd = xopen(output_filename,
+                       (opt & OPT_a) /* append? */
+                       ? (O_CREAT | O_WRONLY | O_CLOEXEC | O_APPEND)
+                       : (O_CREAT | O_WRONLY | O_CLOEXEC | O_TRUNC)
+               );
+       }
 
        run_command(argv, &res);
 
        /* Cheat. printf's are shorter :) */
-       xdup2(STDERR_FILENO, STDOUT_FILENO);
+       xdup2(output_fd, STDOUT_FILENO);
        summarize(output_format, argv, &res);
 
+       ex = WEXITSTATUS(res.waitstatus);
+       /* Impossible: we do not use WUNTRACED flag in wait()...
        if (WIFSTOPPED(res.waitstatus))
-               return WSTOPSIG(res.waitstatus);
+               ex = WSTOPSIG(res.waitstatus);
+       */
        if (WIFSIGNALED(res.waitstatus))
-               return WTERMSIG(res.waitstatus);
-       if (WIFEXITED(res.waitstatus))
-               return WEXITSTATUS(res.waitstatus);
-       fflush_stdout_and_exit(EXIT_SUCCESS);
+               ex = WTERMSIG(res.waitstatus);
+
+       fflush_stdout_and_exit(ex);
 }