965de87e54
This adds a basic test for bpf_override_return to verify it works. We override the main function for mounting a btrfs fs so it'll return -ENOMEM and then make sure that trying to mount a btrfs fs will fail. Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
29 lines
483 B
C
29 lines
483 B
C
#define _GNU_SOURCE
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#include <stdio.h>
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#include <linux/bpf.h>
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#include <unistd.h>
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#include "libbpf.h"
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#include "bpf_load.h"
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int main(int argc, char **argv)
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{
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FILE *f;
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char filename[256];
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char command[256];
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int ret;
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snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
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if (load_bpf_file(filename)) {
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printf("%s", bpf_log_buf);
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return 1;
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}
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snprintf(command, 256, "mount %s tmpmnt/", argv[1]);
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f = popen(command, "r");
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ret = pclose(f);
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return ret ? 0 : 1;
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}
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