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#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
#include <sched.h>
#include "zdtmtst.h"
#include "lock.h"
const char *test_doc =
"Create file descriptors with different numbers. Check that they do not intersect with service fds";
const char *test_author = "Kirill Tkhai <ktkhai@virtuozzo.com>";
int main(int argc, char **argv)
{
unsigned int i, max_nr, flags;
int fd, status, ret;
struct rlimit rlim;
futex_t *futex;
char buf[16];
pid_t pid;
test_init(argc, argv);
futex = mmap(NULL, sizeof(*futex), PROT_WRITE | PROT_READ, MAP_ANONYMOUS | MAP_SHARED, -1, 0);
if (futex == MAP_FAILED) {
fail("mmap");
exit(1);
}
futex_init(futex);
fd = open("/proc/sys/fs/nr_open", O_RDONLY);
if (fd < 0) {
fail("Can't open /proc/sys/fs/nr_open");
exit(1);
}
ret = read(fd, buf, sizeof(buf));
if (ret <= 0) {
fail("Can't read");
exit(1);
}
buf[ret] = '\0';
max_nr = (unsigned int)atol(buf);
if (max_nr == 0) {
fail("max_nr");
exit(1);
}
if (getrlimit(RLIMIT_NOFILE, &rlim)) {
fail("getrlimit");
exit(1);
}
rlim.rlim_cur = rlim.rlim_max;
if (max_nr < rlim.rlim_cur)
rlim.rlim_cur = max_nr;
if (prlimit(getpid(), RLIMIT_NOFILE, &rlim, NULL)) {
fail("rlimir: Can't setup RLIMIT_NOFILE for self");
exit(1);
}
for (i = 1; (fd = (1 << i)) < (rlim.rlim_cur >> 1); i++) {
FILE *fp = tmpfile();
if (!fp) {
fail("tmpfile");
exit(1);
}
/* This fd really exists, skip it */
if (fcntl(fd, F_GETFL) >= 0)
continue;
if (dup2(fileno(fp), fd) < 0) {
fail("dup2");
exit(1);
}
flags = SIGCHLD;
if (i % 2 == 0)
flags |= CLONE_FILES;
pid = sys_clone_unified(flags, NULL, NULL, NULL, 0);
if (pid < 0) {
fail("fork");
exit(1);
} else if (!pid) {
futex_wait_while(futex, 0);
exit(0);
}
}
test_daemon();
test_waitsig();
/* Cleanup */
futex_set_and_wake(futex, 1);
while (wait(&status) > 0) {
if (!WIFEXITED(status) || WEXITSTATUS(status)) {
fail("Wrong exit status: %d", status);
exit(1);
}
}
pass();
return 0;
}
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