/*

    Task Spooler - a task queue system for the unix user

    Copyright (C) 2007-2009  Lluís Batlle i Rossell

    Please find the license in the provided COPYING file.

*/

#include <unistd.h>

#include <stdio.h>

#include <signal.h>

#include <string.h>

#include <sys/types.h>

#include <sys/wait.h>

#include <stdlib.h>

#include <signal.h>

#include <time.h>

#include <sys/times.h>

#include <sys/time.h>

#include "main.h"

/* from signals.c */

extern int signals_child_pid; /* 0, not set. otherwise, set. */

/* Returns errorlevel */

static void run_parent(int fd_read_filename, int pid, struct Result *result)

{

    int status;

    char *ofname = 0;

    int namesize;

    int res;

    char *command;

    struct timeval starttv;

    struct timeval endtv;

    struct tms cpu_times;

    /* Read the filename */

    /* This is linked with the write() in this same file, in run_child() */

    if (command_line.store_output) {

        res = read(fd_read_filename, &namesize, sizeof(namesize));

        if (res == -1)

            error("read the filename from %i", fd_read_filename);

        if (res != sizeof(namesize))

            error("Reading the size of the name");

        ofname = (char *) malloc(namesize);

        res = read(fd_read_filename, ofname, namesize);

        if (res != namesize)

            error("Reading the the out file name");

    }

    res = read(fd_read_filename, &starttv, sizeof(starttv));

    if (res != sizeof(starttv))

        error("Reading the the struct timeval");

    close(fd_read_filename);

    /* All went fine - prepare the SIGINT and send runjob_ok */

    signals_child_pid = pid;

    unblock_sigint_and_install_handler();

    c_send_runjob_ok(ofname, pid);

    wait(&status);

    /* Set the errorlevel */

    if (WIFEXITED(status))

    {

        /* We force the proper cast */

        signed char tmp;

        tmp = WEXITSTATUS(status);

        result->errorlevel = tmp;

        result->died_by_signal = 0;

    }

    else if (WIFSIGNALED(status))

    {

        signed char tmp;

        tmp = WTERMSIG(status);

        result->signal = tmp;

        result->errorlevel = -1;

        result->died_by_signal = 1;

    }

    else

    {

        result->died_by_signal = 0;

        result->errorlevel = -1;

    }

    command = build_command_string();

    if (command_line.send_output_by_mail)

    {

        send_mail(command_line.jobid, result->errorlevel, ofname, command);

    }

    hook_on_finish(command_line.jobid, result->errorlevel, ofname, command);

    free(command);

    free(ofname);

    /* Calculate times */

    gettimeofday(&endtv, NULL);

    result->real_ms = endtv.tv_sec - starttv.tv_sec +

        ((float) (endtv.tv_usec - starttv.tv_usec) / 1000000.);

    times(&cpu_times);

    /* The times are given in clock ticks. The number of clock ticks per second

     * is obtained in POSIX using sysconf(). */

    result->user_ms = (float) cpu_times.tms_cutime /

        (float) sysconf(_SC_CLK_TCK);

    result->system_ms = (float) cpu_times.tms_cstime /

        (float) sysconf(_SC_CLK_TCK);

}

void create_closed_read_on(int dest)

{

    int p[2];

    /* Closing input */

    pipe(p);

    close(p[1]); /* closing the write handle */

    dup2(p[0], dest); /* the pipe reading goes to dest */

    if(p[0] != dest)

        close(p[0]);

}

/* This will close fd_out and fd_in in the parent */

static void run_gzip(int fd_out, int fd_in)

{

    int pid;

    pid = fork();

    switch(pid)

    {

        case 0: /* child */

            restore_sigmask();

            dup2(fd_in,0); /* stdout */

            dup2(fd_out,1); /* stdout */

            close(fd_in);

            close(fd_out);

            /* Without stderr */

            close(2);

            execlp("gzip", "gzip", NULL);

            exit(-1);

            /* Won't return */

       case -1:

            exit(-1); /* Fork error */

       default:

            close(fd_in);

            close(fd_out);

    }

}

static void run_child(int fd_send_filename)

{

    char outfname[] = "/tmp/ts-out.XXXXXX";

    int namesize;

    int outfd;

    struct timeval starttv;

    if (command_line.store_output)

    {

        int res;

        if (command_line.gzip)

        {

            int p[2];

            /* We assume that all handles are closed*/

            pipe(p);

            /* Program stdout and stderr */

            /* which go to pipe write handle */

            dup2(p[1], 1);

            dup2(p[1], 2);

            close(p[1]);

            /* gzip output goes to the filename */

            /* This will be the handle other than 0,1,2 */

            outfd = mkstemp(outfname); /* stdout */

            /* run gzip.

             * This wants p[0] in 0, so gzip will read

             * from it */

            run_gzip(outfd, p[0]);

        }

        else

        {

            /* Prepare the filename */

            outfd = mkstemp(outfname); /* stdout */

            dup2(outfd, 1); /* stdout */

            dup2(outfd, 2); /* stderr */

            close(outfd);

        }

        /* Send the filename */

        namesize = sizeof(outfname);

        res = write(fd_send_filename, (char *)&namesize, sizeof(namesize));

        write(fd_send_filename, outfname, sizeof(outfname));

    }

    /* Times */

    gettimeofday(&starttv, NULL);

    write(fd_send_filename, &starttv, sizeof(starttv));

    close(fd_send_filename);

    /* Closing input */

    if (command_line.should_go_background)

        create_closed_read_on(0);

    /* We create a new session, so we can kill process groups as:

         kill -- -`ts -p` */

    setsid();

    execvp(command_line.command.array[0], command_line.command.array);

}

int run_job(struct Result *res)

{

    int pid;

    int errorlevel;

    int p[2];

    /* For the parent */

    /*program_signal(); Still not needed*/

    block_sigint();

    /* Prepare the output filename sending */

    pipe(p);

    pid = fork();

    switch(pid)

    {

        case 0:

            restore_sigmask();

            close(server_socket);

            close(p[0]);

            run_child(p[1]);

            /* Not reachable, if the 'exec' of the command

             * works. Thus, command exists, etc. */

            fprintf(stderr, "ts could not run the command\n");

            exit(-1);

            /* To avoid a compiler warning */

            errorlevel = 0;

            break;

        case -1:

            /* To avoid a compiler warning */

            errorlevel = 0;

            error("forking");

        default:

            close(p[1]);

            run_parent(p[0], pid, res);

            break;

    }

    return errorlevel;

}

#if 0

Not needed

static void sigchld_handler(int val)

{

}

static void program_signal()

{

  struct sigaction act;

  act.sa_handler = sigchld_handler;

  /* Reset the mask */

  memset(&act.sa_mask,0,sizeof(act.sa_mask));

  act.sa_flags = SA_NOCLDSTOP;

  sigaction(SIGCHLD, &act, NULL);

}

#endif