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#include <stdio.h>
FILE * popen(command, rw)
char * command;
char * rw;
{
int pipe_fd[2];
int pid, reading;
if( pipe(pipe_fd) < 0 ) return NULL;
reading = (rw[0] == 'r');
pid = vfork();
if( pid < 0 ) { close(pipe_fd[0]); close(pipe_fd[1]); return NULL; }
if( pid == 0 )
{
close(pipe_fd[!reading]);
close(reading);
if( pipe_fd[reading] != reading )
{
dup2(pipe_fd[reading], reading);
close(pipe_fd[reading]);
}
execl("/bin/sh", "sh", "-c", command, (char*)0);
_exit(255);
}
close(pipe_fd[reading]);
return fdopen(pipe_fd[!reading], rw);
}
int pclose(fd)
FILE *fd;
{
int waitstat;
if( fclose(fd) != 0 ) return EOF;
wait(&waitstat);
}
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