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206 lines
5.8 KiB
C++
206 lines
5.8 KiB
C++
/**
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* Copyright (c) 2007-2012, Timothy Stack
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Timothy Stack nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @file piper_proc.cc
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*/
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#include "config.h"
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#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <paths.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/param.h>
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#include <sys/time.h>
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#include <signal.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include "piper_proc.hh"
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#include "line_buffer.hh"
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using namespace std;
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static const char *STDIN_EOF_MSG = "---- END-OF-STDIN ----";
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static int write_timestamp(int fd, off_t woff)
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{
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char time_str[64];
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struct timeval tv;
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char ms_str[8];
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gettimeofday(&tv, NULL);
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strftime(time_str, sizeof(time_str), "%FT%T", localtime(&tv.tv_sec));
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snprintf(ms_str, sizeof(ms_str), ".%03d", (int)(tv.tv_usec / 1000));
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strcat(time_str, ms_str);
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strcat(time_str, " ");
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return pwrite(fd, time_str, strlen(time_str), woff);
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}
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piper_proc::piper_proc(int pipefd, bool timestamp, const char *filename)
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: pp_fd(-1), pp_child(-1)
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{
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assert(pipefd >= 0);
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if (filename) {
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if ((this->pp_fd =
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open(filename, O_RDWR | O_CREAT | O_TRUNC, 0600)) == -1) {
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perror("Unable to open output file for stdin");
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throw error(errno);
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}
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}
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else {
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char piper_tmpname[PATH_MAX];
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const char *tmpdir;
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if ((tmpdir = getenv("TMPDIR")) == NULL) {
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tmpdir = _PATH_VARTMP;
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}
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snprintf(piper_tmpname, sizeof(piper_tmpname),
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"%s/lnav.piper.XXXXXX",
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tmpdir);
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if ((this->pp_fd = mkstemp(piper_tmpname)) == -1) {
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throw error(errno);
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}
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unlink(piper_tmpname);
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}
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fcntl(this->pp_fd, F_SETFD, FD_CLOEXEC);
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this->pp_child = fork();
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switch (this->pp_child) {
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case -1:
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throw error(errno);
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case 0:
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{
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auto_fd infd(pipefd);
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line_buffer lb;
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off_t woff = 0;
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off_t off = 0;
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char * line;
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size_t len;
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int nullfd;
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nullfd = open("/dev/null", O_RDWR);
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dup2(nullfd, STDOUT_FILENO);
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fcntl(infd.get(), F_SETFL, O_NONBLOCK);
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lb.set_fd(infd);
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do {
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fd_set rready;
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FD_ZERO(&rready);
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FD_SET(lb.get_fd(), &rready);
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select(lb.get_fd() + 1, &rready, NULL, NULL, NULL);
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while ((line = lb.read_line(off, len)) != NULL) {
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int wrc;
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if (timestamp) {
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wrc = write_timestamp(this->pp_fd, woff);
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if (wrc == -1) {
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perror("Unable to write to output file for stdin");
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break;
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}
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woff += wrc;
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}
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line[len] = '\n';
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/* Need to do pwrite here since the fd is used by the main
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* lnav process as well.
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*/
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wrc = pwrite(this->pp_fd, line, len + 1, woff);
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if (wrc == -1) {
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perror("Unable to write to output file for stdin");
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break;
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}
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woff += wrc;
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}
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} while (lb.get_file_size() == (size_t)-1);
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if (timestamp) {
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int wrc;
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wrc = write_timestamp(this->pp_fd, woff);
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if (wrc == -1) {
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perror("Unable to write to output file for stdin");
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break;
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}
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woff += wrc;
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wrc = pwrite(this->pp_fd,
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STDIN_EOF_MSG, strlen(STDIN_EOF_MSG),
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woff);
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if (wrc == -1) {
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perror("Unable to write to output file for stdin");
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break;
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}
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woff += wrc;
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}
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}
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exit(0);
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break;
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default:
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break;
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}
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}
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bool piper_proc::has_exited()
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{
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if (this->pp_child > 0) {
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int rc, status;
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rc = waitpid(this->pp_child, &status, WNOHANG);
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if (rc == -1 || rc == 0) {
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return false;
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}
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this->pp_child = -1;
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}
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return true;
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}
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piper_proc::~piper_proc()
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{
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if (this->pp_child > 0) {
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int status;
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kill(this->pp_child, SIGTERM);
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while (waitpid(this->pp_child, &status, 0) < 0 && (errno == EINTR)) {
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;
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}
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this->pp_child = -1;
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}
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}
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