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/*
* rhdropbox
*
* Copyright (C) 2009 Christian Pointner <equinox@helsinki.at>
*
* This file is part of rhdropbox.
*
* rhdropbox is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* rhdropbox is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with rhdropbox. If not, see <http://www.gnu.org/licenses/>.
*/
#include "datatypes.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/wait.h>
#include <sys/select.h>
#include <stdlib.h>
#include <string.h>
#include "sysexec.h"
#include "log.h"
void child_list_init(child_list_t* list)
{
if(!list)
return;
list->first_ = NULL;
}
void child_list_clear(child_list_t* list)
{
if(!list)
return;
while(list->first_) {
child_list_element_t* tmp;
tmp = list->first_;
list->first_ = tmp->next_;
if(tmp->script_)
free(tmp->script_);
free(tmp);
}
}
int child_list_add(child_list_t* list, pid_t pid, const char* script, int err_fd)
{
if(!list)
return -1;
if(!list->first_) {
list->first_ = malloc(sizeof(child_list_element_t));
if(!list->first_)
return -2;
list->first_->next_ = 0;
list->first_->pid_ = pid;
list->first_->err_fd_ = err_fd;
list->first_->script_ = strdup(script);
if(!list->first_->script_) {
free(list->first_);
list->first_ = NULL;
return -2;
}
}
else {
child_list_element_t* tmp = list->first_;
while(tmp->next_)
tmp = tmp->next_;
tmp->next_ = malloc(sizeof(child_list_element_t));
if(!tmp->next_)
return -2;
tmp->next_->next_ = 0;
tmp->next_->pid_ = pid;
tmp->next_->err_fd_ = err_fd;
tmp->next_->script_ = strdup(script);
if(!tmp->next_->script_) {
free(tmp->next_);
tmp->next_ = NULL;
return -2;
}
}
return 0;
}
void child_list_rm(child_list_t* list, pid_t pid)
{
if(!list)
return;
child_list_element_t* tmp = NULL;
if(list->first_->pid_ == pid) {
tmp = list->first_;
list->first_ = list->first_->next_;
if(tmp->script_)
free(tmp->script_);
free(tmp);
return;
}
child_list_element_t* prev = list->first_;
tmp = list->first_->next_;
while(tmp) {
if(tmp->pid_ == pid) {
prev->next_ = tmp->next_;
if(tmp->script_)
free(tmp->script_);
free(tmp);
return;
}
prev = tmp;
tmp = tmp->next_;
}
}
child_list_element_t* child_list_find(child_list_t* list, pid_t pid)
{
if(!list)
return NULL;
child_list_element_t* tmp = list->first_;
while(tmp) {
if(tmp->pid_ == pid)
return tmp;
tmp = tmp->next_;
}
return NULL;
}
int rh_exec(const char* script, char* const argv[], char* const evp[], child_list_t* child_lst)
{
if(!script)
return -1;
int pipefd[2];
if(pipe(pipefd) == -1) {
log_printf(ERROR, "executing script '%s' pipe() error: %s", script, strerror(errno));
return -1;
}
pid_t pid;
pid = fork();
if(pid == -1) {
log_printf(ERROR, "executing script '%s' fork() error: %s", script, strerror(errno));
return -1;
}
if(!pid) {
int fd;
for (fd=getdtablesize();fd>=0;--fd) // close all file descriptors
if(fd != pipefd[1]) close(fd);
fd = open("/dev/null",O_RDWR); // stdin
if(fd == -1)
log_printf(WARNING, "can't open stdin");
else {
if(dup(fd) == -1) // stdout
log_printf(WARNING, "can't open stdout");
if(dup(fd) == -1) // stderr
log_printf(WARNING, "can't open stderr");
}
execve(script, argv, evp);
// if execve returns, an error occurred, but logging doesn't work
// because we closed all file descriptors, so just write errno to
// pipe and call exit
write(pipefd[1], (void*)(&errno), sizeof(errno));
exit(-1);
}
close(pipefd[1]);
log_printf(INFO, "called script '%s' with pid %d", script, pid);
return child_list_add(child_lst, pid, script, pipefd[0]);
}
int rh_waitpid(child_list_t* child_lst)
{
int status = 0;
pid_t pid = waitpid(-1, &status, WNOHANG);
if(!pid || (pid < 0 && errno == ECHILD))
return 0;
if(pid < 0) {
log_printf(ERROR, "waitpid returned with error: %s", strerror(errno));
return pid;
}
child_list_element_t* child = child_list_find(child_lst, pid);
if(!child) {
log_printf(ERROR, "waitpid returned unknown child pid (%d)", pid);
return 0;
}
fd_set rfds;
FD_ZERO(&rfds);
FD_SET(child->err_fd_, &rfds);
struct timeval tv = { 0 , 0 };
if(select(child->err_fd_+1, &rfds, NULL, NULL, &tv) == 1) {
int err = 0;
if(read(child->err_fd_, (void*)(&err), sizeof(err)) >= sizeof(err)) {
log_printf(INFO, "script '%s' exec() error: %s", child->script_, strerror(err));
close(child->script_);
return -1;
}
}
if(WIFEXITED(status))
log_printf(INFO, "script '%s' (pid %d) returned %d", child->script_, child->pid_, WEXITSTATUS(status));
else if(WIFSIGNALED(status))
log_printf(INFO, "script '%s' (pid %d) terminated after signal %d", child->script_, child->pid_, WTERMSIG(status));
else
log_printf(INFO, "executing script '%s' (pid %d): unkown error", child->script_, child->pid_);
close(child->err_fd_);
return status;
}
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