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#if !defined(UNSHARE_NO_CODE_AT_ALL) && defined(__FreeBSD__)
#include <sys/types.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
static int _containers_unshare_parse_envint(const char *envname) {
char *p, *q;
long l;
p = getenv(envname);
if (p == NULL) {
return -1;
}
q = NULL;
l = strtol(p, &q, 10);
if ((q == NULL) || (*q != '\0')) {
fprintf(stderr, "Error parsing \"%s\"=\"%s\"!\n", envname, p);
_exit(1);
}
unsetenv(envname);
return l;
}
void _containers_unshare(void)
{
int pidfd, continuefd, n, pgrp, sid, ctty;
char buf[2048];
pidfd = _containers_unshare_parse_envint("_Containers-pid-pipe");
if (pidfd != -1) {
snprintf(buf, sizeof(buf), "%llu", (unsigned long long) getpid());
size_t size = write(pidfd, buf, strlen(buf));
if (size != strlen(buf)) {
fprintf(stderr, "Error writing PID to pipe on fd %d: %m\n", pidfd);
_exit(1);
}
close(pidfd);
}
continuefd = _containers_unshare_parse_envint("_Containers-continue-pipe");
if (continuefd != -1) {
n = read(continuefd, buf, sizeof(buf));
if (n > 0) {
fprintf(stderr, "Error: %.*s\n", n, buf);
_exit(1);
}
close(continuefd);
}
sid = _containers_unshare_parse_envint("_Containers-setsid");
if (sid == 1) {
if (setsid() == -1) {
fprintf(stderr, "Error during setsid: %m\n");
_exit(1);
}
}
pgrp = _containers_unshare_parse_envint("_Containers-setpgrp");
if (pgrp == 1) {
if (setpgrp(0, 0) == -1) {
fprintf(stderr, "Error during setpgrp: %m\n");
_exit(1);
}
}
ctty = _containers_unshare_parse_envint("_Containers-ctty");
if (ctty != -1) {
if (ioctl(ctty, TIOCSCTTY, 0) == -1) {
fprintf(stderr, "Error while setting controlling terminal to %d: %m\n", ctty);
_exit(1);
}
}
}
#endif
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