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#ifndef _WIN32
// includes
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <wordexp.h>
#include <sys/wait.h>
#include "pipex.h"
// prototypes
static void my_close(int fd);
static void my_dup2(int old_fd, int new_fd) ;
// functions
// pipex_open()
void pipex_open(pipex_t *pipex,
const char *name,
const char *working_dir,
const char *command){
char string[StringSize];
int argc;
char * ptr;
char * argv[256];
int from_child[2], to_child[2];
wordexp_t p;
int i,ret;
pipex->pid=-1;
pipex->io->name=name;
pipex->quit_pending=FALSE;
pipex->command=command;
if(command==NULL){
pipex->io->in_fd = STDIN_FILENO;
pipex->io->out_fd = STDOUT_FILENO;
// attach standard error to standard output
my_dup2(STDOUT_FILENO,STDERR_FILENO);
io_init(pipex->io);
}else{
// parse the command line and create the argument list
#if 0
if (strlen(command) >= StringSize) my_fatal("pipex_open(): buffer overflow\n");
strcpy(string,command);
argc = 0;
for (ptr = strtok(string," "); ptr != NULL; ptr = strtok(NULL," ")) {
argv[argc++] = ptr;
}
argv[argc] = NULL;
#else
//printf("command=[%s]\n",command);
//Buffer overflow alert
ret=wordexp(command, &p, 0);
if(ret!=0){
my_fatal("pipex_open(): %s: Unable to parse command.\n",command);
}
argc = p.we_wordc;
if(argc>=256-2){
my_fatal("pipex_open(): %s: Too many arguments.\n",command);
}
for(i=0;i<argc;i++){
argv[i] = p.we_wordv[i];
}
// int i;
//for(i=0;i<argc;i++){
// printf("[%s]",argv[i]);
//}
//printf("\n");
argv[argc] = NULL;
#endif
// create the pipes
if (pipe(from_child) == -1) {
my_fatal("pipex_open(): pipe(): %s\n",strerror(errno));
}
if (pipe(to_child) == -1) {
my_fatal("pipex_open(): pipe(): %s\n",strerror(errno));
}
// create the child process
pipex->pid = fork();
if (pipex->pid == -1) {
my_fatal("pipex_open(): fork(): %s\n",strerror(errno));
} else if (pipex->pid == 0) {
// child
// close unused pipe descriptors to avoid deadlocks
my_close(from_child[0]);
my_close(to_child[1]);
// attach the pipe to standard input
my_dup2(to_child[0],STDIN_FILENO);
my_close(to_child[0]);
// attach the pipe to standard output
my_dup2(from_child[1],STDOUT_FILENO);
my_close(from_child[1]);
// attach standard error to standard output
// commenting this out gives error messages on the console
my_dup2(STDOUT_FILENO,STDERR_FILENO);
if(chdir(working_dir)){
printf("%s pipex_open(): %s: %s\n",
PIPEX_MAGIC,
working_dir,
strerror(errno));
goto wait_for_eof;
}
// launch the new executable file
execvp(argv[0],&argv[0]);
// execvp() only returns when an error has occured
printf("%s pipex_open(): execvp(): %s: %s\n",
PIPEX_MAGIC,
argv[0],
strerror(errno));
wait_for_eof:
while(fgets(string,StringSize,stdin));
exit(EXIT_SUCCESS);
} else { // pid > 0
ASSERT(pipex->pid>0);
// parent
// close unused pipe descriptors to avoid deadlocks
my_close(from_child[1]);
my_close(to_child[0]);
// fill in the pipex struct
pipex->io->in_fd = from_child[0];
pipex->io->out_fd = to_child[1];
pipex->state|=PIPEX_ACTIVE; // can we test if this really TRUE?
io_init(pipex->io);
}
}
}
void pipex_wait_event(pipex_t *pipex[]){
fd_set set[1];
pipex_t *p;
int fd_max;
int val;
pipex_t **q;
q=pipex;
// init
FD_ZERO(set);
fd_max = -1; // HACK
while((p=*(q++))!=NULL){
ASSERT(p->io->in_fd>=0);
FD_SET(p->io->in_fd,set);
if (p->io->in_fd > fd_max){
fd_max = p->io->in_fd;
}
}
// wait for something to read (no timeout)
ASSERT(fd_max>=0);
val = select(fd_max+1,set,NULL,NULL,NULL);
if (val == -1 && errno != EINTR) my_fatal("pipex_wait_event(): select(): %s\n",strerror(errno));
q=pipex;
if (val > 0) {
while((p=*(q++))!=NULL){
if (FD_ISSET(p->io->in_fd,set) /*&& !io_line_ready(p->io)*/){
io_get_update(p->io);
}
}
}
}
// pipex_active()
bool pipex_active(pipex_t *pipex){
return (pipex->state&PIPEX_ACTIVE)!=0;
}
// pipex_eof()
bool pipex_eof(pipex_t *pipex){
return (pipex->state&PIPEX_EOF)!=0;
}
// pipex_set_priority()
void pipex_set_priority(pipex_t *pipex, int value){
if(pipex->pid!=-1){
setpriority(PRIO_PROCESS,pipex->pid,value);
}
}
// pipex_set_affinity()
void pipex_set_affinity(pipex_t *pipex, int value){
my_log("POLYGLOT Setting affinity is not yet implemented on posix\n");
}
// pipex_send_eof()
void pipex_send_eof(pipex_t *pipex){
io_close(pipex->io);
}
// pipex_exit()
/* This routine waits for kill_timeout milliseconds for
* the process to exit by itself. If that doesn't
* happen it will kill the process.
*/
void pipex_exit(pipex_t *pipex, int kill_timeout){
int status;
int elapsed_time;
bool exited;
int ret;
my_log("POLYGLOT Waiting for child process to exit.\n");
elapsed_time=0;
exited=FALSE;
ret=0;
while(elapsed_time<kill_timeout){
ret=waitpid(pipex->pid,&status,WNOHANG);
if(ret==0){
my_log("POLYGLOT Child has not exited yet. Sleeping %dms.\n", WAIT_GRANULARITY);
my_sleep(WAIT_GRANULARITY);
elapsed_time+=WAIT_GRANULARITY;
}else{
exited=TRUE;
break;
}
}
if(!exited){
my_log("POLYGLOT Child wouldn't exit by itself. Terminating it.\n");
kill(pipex->pid,SIGKILL);
waitpid(pipex->pid,&status,0);
}
if(WIFEXITED(status)){
if(pipex->quit_pending){
my_log("POLYGLOT Child exited with status %d.\n",WEXITSTATUS(status));
}else{
// Suppress further messages.
pipex->quit_pending=TRUE;
my_fatal("pipex_exit(): %s: child exited with status %d.\n",pipex->command,WEXITSTATUS(status));
}
}else if(WIFSIGNALED(status)){
if(pipex->quit_pending){
my_log("POLYGLOT pipex_exit(): %s: child terminated with signal %d.\n",pipex->command,WTERMSIG(status));
}else{
// Suppress further messages.
pipex->quit_pending=TRUE;
my_fatal("pipex_exit(): %s: child terminated with signal %d.\n",pipex->command,WTERMSIG(status));
}
}
return;
}
// pipex_get_buffer()
char * pipex_get_buffer(pipex_t *pipex){
return pipex->io->in_buffer;
}
// pipex_readln()
bool pipex_readln(pipex_t *pipex, char *string){
while (!io_line_ready(pipex->io)) {
io_get_update(pipex->io);
}
if (!io_get_line(pipex->io,string,StringSize)) { // EOF
string[0]='\0';
pipex->state|=PIPEX_EOF;
return FALSE;
}
if(strncmp(PIPEX_MAGIC,string,strlen(PIPEX_MAGIC))==0){
my_fatal("%s\n",string+strlen(PIPEX_MAGIC)+1);
}
return TRUE;
}
// pipex_readln_nb()
bool pipex_readln_nb(pipex_t *pipex, char *string){
while(!pipex->io->in_eof && !io_line_ready(pipex->io) && io_peek(pipex->io)){
io_get_update(pipex->io);
}
if(io_line_ready(pipex->io)){
return pipex_readln(pipex,string);
}else if(pipex->io->in_eof){
string[0]='\0';
pipex->state|=PIPEX_EOF;
return FALSE;
}else {
string[0]='\0';
return FALSE;
}
}
// pipex_write()
void pipex_write(pipex_t *pipex, const char *string){
io_send_queue(pipex->io,"%s",string);
}
// pipex_writeln()
void pipex_writeln(pipex_t *pipex, const char *string){
io_send(pipex->io,"%s",string);
}
// my_close()
static void my_close(int fd) {
ASSERT(fd>=0);
if (close(fd) == -1) my_fatal("my_close(): close(): %s\n",strerror(errno));
}
// my_dup2()
static void my_dup2(int old_fd, int new_fd) {
ASSERT(old_fd>=0);
ASSERT(new_fd>=0);
if (dup2(old_fd,new_fd) == -1) my_fatal("my_dup2(): dup2(): %s\n",strerror(errno));
}
#endif
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