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#include "dietstdio.h"
#include <unistd.h>
extern char **environ;
FILE *popen(const char *command, const char *type) {
int pfd[2];
int fd0;
pid_t pid;
if (pipe(pfd)<0) return 0;
fd0=(*type=='r');
if ((pid=vfork())<0) {
close(pfd[0]);
close(pfd[1]);
return 0;
}
if (!pid) { /* child */
char *argv[]={"sh","-c",0,0};
close(pfd[!fd0]); close(fd0);
dup2(pfd[fd0],fd0); close(pfd[fd0]);
argv[2]=(char*)command;
execve("/bin/sh",argv,environ);
_exit(255);
}
close(pfd[fd0]);
{
register FILE* f;
if ((f=fdopen(pfd[!fd0],type)))
f->popen_kludge=pid;
return f;
}
}
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