97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <cutils/klog.h>
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#include <log/log.h>
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#include <logwrap/logwrap.h>
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void fatal(const char *msg) {
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fprintf(stderr, "%s", msg);
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ALOG(LOG_ERROR, "logwrapper", "%s", msg);
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exit(-1);
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}
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void usage() {
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fatal(
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"Usage: logwrapper [-a] [-d] [-k] BINARY [ARGS ...]\n"
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"\n"
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"Forks and executes BINARY ARGS, redirecting stdout and stderr to\n"
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"the Android logging system. Tag is set to BINARY, priority is\n"
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"always LOG_INFO.\n"
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"\n"
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"-a: Causes logwrapper to do abbreviated logging.\n"
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" This logs up to the first 4K and last 4K of the command\n"
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" being run, and logs the output when the command exits\n"
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"-d: Causes logwrapper to SIGSEGV when BINARY terminates\n"
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" fault address is set to the status of wait()\n"
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"-k: Causes logwrapper to log to the kernel log instead of\n"
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" the Android system log\n");
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}
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int main(int argc, char* argv[]) {
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int seg_fault_on_exit = 0;
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int log_target = LOG_ALOG;
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bool abbreviated = false;
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int ch;
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int status = 0xAAAA;
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int rc;
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while ((ch = getopt(argc, argv, "adk")) != -1) {
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switch (ch) {
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case 'a':
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abbreviated = true;
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break;
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case 'd':
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seg_fault_on_exit = 1;
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break;
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case 'k':
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log_target = LOG_KLOG;
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klog_set_level(6);
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break;
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case '?':
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (argc < 1) {
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usage();
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}
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rc = android_fork_execvp_ext(argc, &argv[0], &status, true,
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log_target, abbreviated, NULL, NULL, 0);
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if (!rc) {
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if (WIFEXITED(status))
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rc = WEXITSTATUS(status);
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else
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rc = -ECHILD;
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}
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if (seg_fault_on_exit) {
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uintptr_t fault_address = (uintptr_t) status;
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*(int *) fault_address = 0; // causes SIGSEGV with fault_address = status
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}
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return rc;
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}
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