12 #define STDOUT_FILENO 1
15 #define STDERR_FILENO 2
18 extern char **environ;
19 static void close_fd (int *fd) { if ((*fd) >= 0) close (*fd); *fd = -1; }
21 int main(int argc, char *argv[]) {
23 // TODO: if argv > 3, assume pok[] is given, notifify parent.
24 // usage() and a man-page (help2man) would not be bad, either :)
32 pok[0] = atoi(argv[1]);
33 pok[1] = atoi(argv[2]);
34 pin[0] = atoi(argv[3]);
35 pin[1] = atoi(argv[4]);
36 pout[0] = atoi(argv[5]);
37 pout[1] = atoi(argv[6]);
39 int stderr_mode = atoi(argv[7]);
40 int nicelevel = atoi(argv[8]);
42 /* vfork()ed child process - exec external process */
44 fcntl(pok[1], F_SETFD, FD_CLOEXEC);
47 if (pin[0] != STDIN_FILENO) {
48 dup2(pin[0], STDIN_FILENO);
52 if (pout[1] != STDOUT_FILENO) {
53 dup2(pout[1], STDOUT_FILENO);
56 if (stderr_mode == 2) {
57 /* merge STDERR into output */
58 if (pout[1] != STDERR_FILENO) {
59 dup2(pout[1], STDERR_FILENO);
61 } else if (stderr_mode == 1) {
68 if (pout[1] != STDOUT_FILENO && pout[1] != STDERR_FILENO) {
76 /* copy current environment */
79 envp = (char **) calloc(1, sizeof(char*));
80 for (i=0;environ[i];++i) {
81 envp[i] = strdup(environ[i]);
82 envp = (char **) realloc(envp, (i+2) * sizeof(char*));
87 sigset(SIGPIPE, SIG_DFL);
89 signal(SIGPIPE, SIG_DFL);
93 execve(argv[9], &argv[9], envp);
95 /* if we reach here something went wrong.. */
97 (void) write(pok[1], &buf, 1 );