Module: Kernel

Defined in:
(unknown)

Instance Method Summary collapse

Instance Method Details

#execute_sh(rb_stdin, rb_timeout, rb_command) ⇒ Object

Ruby classes and functions



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# File 'ext/sse/sse.c', line 59

VALUE rb_execute_sh(VALUE self, VALUE rb_stdin, VALUE rb_timeout, VALUE rb_command) {
    int stdin_ends[2];
    int stdout_ends[2];
    int stderr_ends[2];

    if(pipe(stdin_ends) == -1 || pipe(stdout_ends) == -1 || pipe(stderr_ends) == -1) {
        rb_raise(sse_PipeFailureError, "%s:%d (%d) pipe: %s\n", __FILE__, __LINE__, errno, strerror(errno));
    }

    char **command_list = split(StringValueCStr(rb_command), (char*)" ");
    char *stdin_buf = StringValueCStr(rb_stdin);
    pid_t pid = fork();

    if(pid > 0) {
        size_t stdout_buf_size = 0;
        size_t stderr_buf_size = 0;
        size_t stdout_buf_max = 1;
        size_t stderr_buf_max = 1;
        char *stdout_buf = malloc(1);
        char *stderr_buf = malloc(1);

        stdout_buf[0] = '\0';
        stderr_buf[0] = '\0';

        time_t start = time(NULL);
        time_t timeout = NUM2INT(rb_timeout);
        int sent_stdin = 0;

        close(stdin_ends[0]);
        close(stdout_ends[1]);
        close(stderr_ends[1]);

        while(difftime(time(NULL), start) < timeout) {
            int status = waitpid(pid, NULL, WNOHANG);

            if(status == -1) {
                rb_raise(sse_WaitpidFailureError, "%s:%d (%d) waitpid: %s\n", __FILE__, __LINE__, errno, strerror(errno));
            } else if(status == 0) {
                fd_set write_set;
                fd_set read_set;
                struct timeval select_timeout = { 0, 0 };
                int maxfd = (stdin_ends[1] > stdout_ends[0] ? (stdin_ends[1] > stderr_ends[0] ? stdin_ends[1] : stderr_ends[0]) : (stdout_ends[0] > stderr_ends[0] ? stdout_ends[0] : stderr_ends[0]));

                FD_ZERO(&write_set);
                FD_ZERO(&read_set);

                if(sent_stdin == 0) {
                    FD_SET(stdin_ends[1], &write_set);
                }

                FD_SET(stdout_ends[0], &read_set);
                FD_SET(stderr_ends[0], &read_set);

                select(maxfd+1, &read_set, &write_set, NULL, &select_timeout);

                if(FD_ISSET(stdin_ends[1], &write_set)) {
                    sent_stdin = 1;

                    if(write(stdin_ends[1], stdin_buf, strlen(stdin_buf)) == -1) {
                        rb_raise(sse_WriteFailureError, "%s:%d (%d) write: %s\n", __FILE__, __LINE__, errno, strerror(errno));
                    }

                    close(stdin_ends[1]);
                }

                if(FD_ISSET(stdout_ends[0], &read_set)) {
                    char tmp_buf[251];
                    ssize_t bytes_read = read(stdout_ends[0], tmp_buf, 250);

                    if(bytes_read == -1) {
                        rb_raise(sse_ReadFailureError, "%s:%d (%d) read: %s\n", __FILE__, __LINE__, errno, strerror(errno));
                    }

                    tmp_buf[bytes_read] = '\0';

                    while((stdout_buf_size + bytes_read+1) >= stdout_buf_max) {
                        stdout_buf_max *= 2;
                        stdout_buf = realloc(stdout_buf, stdout_buf_max);
                    }

                    strncpy(stdout_buf, tmp_buf, bytes_read);
                    stdout_buf_size += bytes_read;
                    stdout_buf[stdout_buf_size] = '\0';
                }

                if(FD_ISSET(stderr_ends[0], &read_set)) {
                    char tmp_buf[251];
                    ssize_t bytes_read = read(stderr_ends[0], tmp_buf, 250);

                    if(bytes_read == -1) {
                        rb_raise(sse_ReadFailureError, "%s:%d (%d) read: %s\n", __FILE__, __LINE__, errno, strerror(errno));
                    }

                    tmp_buf[bytes_read] = '\0';

                    while((stderr_buf_size + bytes_read+1) >= stderr_buf_max) {
                        stderr_buf_max *= 2;
                        stderr_buf = realloc(stderr_buf, stderr_buf_max);
                    }

                    strncpy(stderr_buf, tmp_buf, bytes_read);
                    stderr_buf_size += bytes_read;
                    stderr_buf[stderr_buf_size] = '\0';
                }
            } else {
                close(stdout_ends[0]);
                close(stderr_ends[1]);
                VALUE result = rb_ary_new2(3);
                rb_ary_store(result, 0, INT2NUM(difftime(time(NULL), start)));
                rb_ary_store(result, 1, rb_str_new_cstr(stdout_buf));
                rb_ary_store(result, 2, rb_str_new_cstr(stderr_buf));
                return result;
            }
        }

        kill(SIGINT, pid);
        rb_raise(sse_TimeoutError, "Proccess took too long to finish.\n");
    } else if(pid == 0) {
        dup2(stdin_ends[0], STDIN_FILENO);
        dup2(stdout_ends[1], STDOUT_FILENO);
        dup2(stderr_ends[1], STDERR_FILENO);
        close(stdin_ends[1]);
        close(stdout_ends[0]);
        close(stderr_ends[0]);

        if(execvp(command_list[0], command_list) == -1) {
            rb_raise(sse_ForkFailureError, "%s:%d (%d) execvp: %s\n", __FILE__, __LINE__, errno, strerror(errno));
        }
    } else {
        rb_raise(sse_FileNotFoundError, "%s:%d (%d) execvp: %s\n", __FILE__, __LINE__, errno, strerror(errno));
    }

    VALUE thunderfury_blessed_blade_of_the_windseeker = rb_ary_new2(3);
    rb_ary_store(thunderfury_blessed_blade_of_the_windseeker, 0, INT2NUM(42));
    rb_ary_store(thunderfury_blessed_blade_of_the_windseeker, 1, rb_str_new_cstr("this is stdout"));
    rb_ary_store(thunderfury_blessed_blade_of_the_windseeker, 2, rb_str_new_cstr("this is stderr"));
    return thunderfury_blessed_blade_of_the_windseeker;
}