32 lines
662 B
C
32 lines
662 B
C
#define _GNU_SOURCE
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#include <fcntl.h>
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#include <sched.h>
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#include <unistd.h>
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#include <stdlib.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
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main(int argc, char *argv[])
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{
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int fd;
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if (argc < 3) {
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fprintf(stderr, "%s /proc/PID/ns/FILE cmd args...\n", argv[0]);
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exit(EXIT_FAILURE);
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}
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fd = open(argv[1], O_RDONLY); /* Get descriptor for namespace */
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if (fd == -1)
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errExit("open");
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//if (setns(fd, CLONE_NEWNS) == -1)
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if (setns(fd, 0) == -1) /* Join that namespace */
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errExit("setns");
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execvp(argv[2], &argv[2]); /* Execute a command in namespace */
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errExit("execvp");
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}
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