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#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/resource.h>
#include <unistd.h>
int main(int argc, char **argv)
{
struct rlimit oldrlim;
struct rlimit newrlim;
int fd;
close(4); /* seems to be inherited from parent on SuSE 10.1 amd64 */
if (getrlimit(RLIMIT_NOFILE, &oldrlim) < 0)
{
perror("getrlimit");
exit(1);
}
newrlim.rlim_cur = oldrlim.rlim_cur / 2;
newrlim.rlim_max = oldrlim.rlim_max;
if (setrlimit(RLIMIT_NOFILE, &newrlim) < 0)
{
perror("setrlimit");
exit(1);
}
if (getrlimit(RLIMIT_NOFILE, &newrlim) < 0)
{
perror("getrlimit");
exit(1);
}
if (newrlim.rlim_cur != oldrlim.rlim_cur / 2)
{
fprintf(stderr, "rlim_cur is %lu (should be %lu)\n",
newrlim.rlim_cur, oldrlim.rlim_cur / 2);
}
if (newrlim.rlim_max != oldrlim.rlim_max)
{
fprintf(stderr, "rlim_max is %lu (should be %lu)\n",
newrlim.rlim_max, oldrlim.rlim_max);
}
newrlim.rlim_cur -= 3; /* allow for stdin, stdout and stderr */
while (newrlim.rlim_cur-- > 0)
{
if (open("/dev/null", O_RDONLY) < 0)
{
perror("open");
}
}
if ((fd = open("/dev/null", O_RDONLY)) >= 0)
{
fprintf(stderr, "open succeeded with fd %d - it should have failed!\n", fd);
}
else if (errno != EMFILE)
{
perror("open");
}
exit(0);
}
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