logwrapper.c revision 8c940ef7dbd423cadc92982b44a65ed1014389e2
149e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat/* 249e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat * Copyright (C) 2008 The Android Open Source Project 349e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat * 449e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat * Licensed under the Apache License, Version 2.0 (the "License"); 549e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat * you may not use this file except in compliance with the License. 649e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat * You may obtain a copy of the License at 749e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat * 849e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat * http://www.apache.org/licenses/LICENSE-2.0 949e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat * 1049e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat * Unless required by applicable law or agreed to in writing, software 1149e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat * distributed under the License is distributed on an "AS IS" BASIS, 1249e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1349e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat * See the License for the specific language governing permissions and 1449e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat * limitations under the License. 1549e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat */ 1649e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat 1749e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat#include <string.h> 1849e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat#include <sys/types.h> 1949e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat#include <sys/wait.h> 2049e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat#include <stdio.h> 2149e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat#include <stdlib.h> 2249e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat#include <unistd.h> 2349e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat#include <errno.h> 2449e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat#include <fcntl.h> 2549e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat 2649e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat#include "private/android_filesystem_config.h" 2749e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat#include "cutils/log.h" 2849e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat 2949e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehatint parent(const char *tag, int parent_read) { 3049e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat int status; 3149e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat char buffer[4096]; 3249e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat 3349e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat int a = 0; // start index of unprocessed data 3449e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat int b = 0; // end index of unprocessed data 3549e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat int sz; 3649e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat while ((sz = read(parent_read, &buffer[b], sizeof(buffer) - 1 - b)) > 0) { 3749e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat 3849e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat sz += b; 3949e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat // Log one line at a time 4049e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat for (b = 0; b < sz; b++) { 4149e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat if (buffer[b] == '\r') { 4249e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat buffer[b] = '\0'; 4349e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat } else if (buffer[b] == '\n') { 4449e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat buffer[b] = '\0'; 4549e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat 4649e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat LOG(LOG_INFO, tag, "%s", &buffer[a]); 4749e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat a = b + 1; 4849e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat } 4949e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat } 5049e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat 5149e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat if (a == 0 && b == sizeof(buffer) - 1) { 5249e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat // buffer is full, flush 5349e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat buffer[b] = '\0'; 5449e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat LOG(LOG_INFO, tag, &buffer[a]); 5549e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat b = 0; 5649e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat } else if (a != b) { 5749e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat // Keep left-overs 5849e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat b -= a; 5949e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat memmove(buffer, &buffer[a], b); 6049e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat a = 0; 6149e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat } else { 6249e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat a = 0; 6349e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat b = 0; 6449e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat } 6549e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat 6649e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat } 6749e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat // Flush remaining data 6849e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat if (a != b) { 6949e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat buffer[b] = '\0'; 7049e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat LOG(LOG_INFO, tag, &buffer[a]); 7149e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat } 7249e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat status = 0xAAAA; 7349e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat if (wait(&status) != -1) { // Wait for child 7449e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat if (WIFEXITED(status)) { 7549e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat LOG(LOG_INFO, "logwrapper", "%s terminated by exit(%d)", tag, 7649e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat WEXITSTATUS(status)); 7749e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat return WEXITSTATUS(status); 7849e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat } else if (WIFSIGNALED(status)) 7949e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat LOG(LOG_INFO, "logwrapper", "%s terminated by signal %d", tag, 8049e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat WTERMSIG(status)); 8149e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat else if (WIFSTOPPED(status)) 8249e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat LOG(LOG_INFO, "logwrapper", "%s stopped by signal %d", tag, 8349e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat WSTOPSIG(status)); 8449e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat } else 8549e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat LOG(LOG_INFO, "logwrapper", "%s wait() failed: %s (%d)", tag, 8649e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat strerror(errno), errno); 8749e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat return -EAGAIN; 8849e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat} 8949e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat 9049e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehatvoid child(int argc, const char**argv) { 9149e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat // create null terminated argv_child array 9249e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat char* argv_child[argc + 1]; 9349e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat memcpy(argv_child, argv, argc * sizeof(char *)); 9449e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat argv_child[argc] = NULL; 9549e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat 9649e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat // XXX: PROTECT FROM VIKING KILLER 9749e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat if (execv(argv_child[0], argv_child)) { 9849e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat LOG(LOG_ERROR, "logwrapper", 9949e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat "executing %s failed: %s", argv_child[0], strerror(errno)); 10049e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat exit(-1); 10149e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat } 10249e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat} 10349e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat 10449e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehatint logwrap(int argc, const char* argv[], int background) 10549e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat{ 10649e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat pid_t pid; 10749e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat 10849e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat int parent_ptty; 10949e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat int child_ptty; 11049e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat char *child_devname = NULL; 11149e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat 11249e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat /* Use ptty instead of socketpair so that STDOUT is not buffered */ 11349e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat parent_ptty = open("/dev/ptmx", O_RDWR); 11449e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat if (parent_ptty < 0) { 11549e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat LOG(LOG_ERROR, "logwrapper", "Cannot create parent ptty"); 11649e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat return -errno; 11749e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat } 11849e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat 11949e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat if (grantpt(parent_ptty) || unlockpt(parent_ptty) || 12049e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat ((child_devname = (char*)ptsname(parent_ptty)) == 0)) { 12149e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat LOG(LOG_ERROR, "logwrapper", "Problem with /dev/ptmx"); 1228c940ef7dbd423cadc92982b44a65ed1014389e2San Mehat close(parent_ptty); 12349e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat return -1; 12449e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat } 12549e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat 12649e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat pid = fork(); 12749e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat if (pid < 0) { 12849e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat LOG(LOG_ERROR, "logwrapper", "Failed to fork"); 12949e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat return -errno; 13049e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat } else if (pid == 0) { 1318c940ef7dbd423cadc92982b44a65ed1014389e2San Mehat /* 1328c940ef7dbd423cadc92982b44a65ed1014389e2San Mehat * Child 1338c940ef7dbd423cadc92982b44a65ed1014389e2San Mehat */ 13449e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat child_ptty = open(child_devname, O_RDWR); 13549e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat if (child_ptty < 0) { 13649e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat LOG(LOG_ERROR, "logwrapper", "Problem with child ptty"); 13749e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat return -errno; 13849e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat } 13949e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat 14049e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat // redirect stdout and stderr 14149e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat close(parent_ptty); 14249e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat dup2(child_ptty, 1); 14349e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat dup2(child_ptty, 2); 14449e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat close(child_ptty); 14549e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat 14649e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat if (background) { 14749e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat int fd = open("/dev/cpuctl/bg_non_interactive/tasks", O_WRONLY); 14849e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat 14949e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat if (fd >=0 ) { 15049e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat char text[64]; 15149e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat 15249e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat sprintf(text, "%d", getpid()); 15349e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat if (write(fd, text, strlen(text)) < 0) { 15449e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat LOG(LOG_WARN, "logwrapper", 15549e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat "Unable to background process (%s)", strerror(errno)); 15649e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat close(fd); 15749e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat } 15849e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat close(fd); 15949e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat } else { 16049e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat LOG(LOG_WARN, "logwrapper", 16149e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat "Unable to background process (%s)", strerror(errno)); 16249e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat } 16349e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat } 16449e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat 16549e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat child(argc, argv); 16649e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat } else { 1678c940ef7dbd423cadc92982b44a65ed1014389e2San Mehat /* 1688c940ef7dbd423cadc92982b44a65ed1014389e2San Mehat * Parent 1698c940ef7dbd423cadc92982b44a65ed1014389e2San Mehat */ 1708c940ef7dbd423cadc92982b44a65ed1014389e2San Mehat int rc = parent(argv[0], parent_ptty); 1718c940ef7dbd423cadc92982b44a65ed1014389e2San Mehat close(parent_ptty); 1728c940ef7dbd423cadc92982b44a65ed1014389e2San Mehat return rc; 17349e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat } 17449e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat 17549e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat return 0; 17649e2bce5b74129c26a35e25d4693cbfe98c4688eSan Mehat} 177