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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "replace.h"
#include "closefrom_except.h"
#include <popt.h>
int closefrom_except(int lower, int *fds, size_t num_fds)
{
size_t i;
int max_keep = -1;
int fd, ret;
for (i=0; i<num_fds; i++) {
max_keep = MAX(max_keep, fds[i]);
}
if (max_keep == -1) {
return 0;
}
for (fd = lower; fd < max_keep; fd++) {
bool keep = false;
/*
* O(num_fds*max_keep), but we expect the number of
* fds to keep to be very small, typically 0,1,2 and
* very few more.
*/
for (i=0; i<num_fds; i++) {
if (fd == fds[i]) {
keep = true;
break;
}
}
if (keep) {
continue;
}
ret = close(fd);
if ((ret == -1) && (errno != EBADF)) {
return errno;
}
}
closefrom(MAX(lower, max_keep+1));
return 0;
}
int closefrom_except_fd_params(
int lower,
size_t num_fd_params,
const char *fd_params[],
int argc,
const char *argv[])
{
int fds[num_fd_params];
size_t i;
struct poptOption long_options[num_fd_params + 1];
poptContext pc;
int ret;
for (i=0; i<num_fd_params; i++) {
fds[i] = -1;
long_options[i] = (struct poptOption) {
.longName = fd_params[i],
.argInfo = POPT_ARG_INT,
.arg = &fds[i],
};
}
long_options[num_fd_params] = (struct poptOption) { .longName=NULL, };
pc = poptGetContext(argv[0], argc, argv, long_options, 0);
while ((ret = poptGetNextOpt(pc)) != -1) {
/* do nothing */
}
poptFreeContext(pc);
ret = closefrom_except(lower, fds, ARRAY_SIZE(fds));
return ret;
}
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