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/*
20160225
Jan Mojzis
Public domain.
*/
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>
int main(int argc, char **argv) {
pid_t pid;
int tochild[2] = {-1, -1};
int fromchild[2] = {-1, -1};
if (argc < 2) _exit(111);
if (!argv[0]) _exit(111);
if (!argv[1]) _exit(111);
++argv;
if (pipe(tochild) == -1) _exit(111);
if (pipe(fromchild) == -1) _exit(111);
pid = fork();
if (pid == -1) _exit(111);
if (pid == 0) {
close(tochild[1]);
close(fromchild[0]);
close(1); /* simulate closed connection */
if (dup2(tochild[0], 0) == -1) _exit(111);
if (dup2(fromchild[1], 1) == -1) _exit(111);
execvp(*argv, argv);
_exit(111);
}
close(tochild[0]);
close(fromchild[1]);
close(0);
if (dup2(fromchild[0], 0) == -1) _exit(111);
close(1);
if (dup2(tochild[1], 1) == -1) _exit(111);
signal(SIGPIPE, SIG_IGN);
_exit(111);
}
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