63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
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/*
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* Copyright (c) 2016 Red Hat, Inc.
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*
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* This program is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see http://www.gnu.org/licenses/.
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*
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*/
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#include <linux/fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#define errExit(msg) do { perror(msg); exit(EXIT_FAILURE); \
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} while (0)
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int main(int argc, char *argv[])
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{
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int fd;
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unsigned int seals;
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if (argc != 2) {
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fprintf(stderr, "%s /proc/PID/fd/FD\n", argv[0]);
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exit(EXIT_FAILURE);
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}
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fd = open(argv[1], O_RDWR);
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if (fd == -1)
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errExit("open");
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seals = fcntl(fd, F_GET_SEALS);
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if (seals == -1)
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errExit("fcntl");
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printf("Existing seals:");
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if (seals & F_SEAL_SEAL)
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printf(" SEAL");
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if (seals & F_SEAL_GROW)
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printf(" GROW");
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if (seals & F_SEAL_WRITE)
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printf(" WRITE");
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if (seals & F_SEAL_SHRINK)
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printf(" SHRINK");
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printf("\n");
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/* Code to map the file and access the contents of the
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resulting mapping omitted */
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exit(EXIT_SUCCESS);
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}
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