64 lines
1.1 KiB
C
64 lines
1.1 KiB
C
#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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int main(int argc, char **argv)
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{
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const char *path;
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char buf[5];
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int fd, rc;
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if (argc < 2) {
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fprintf(stderr, "usage: %s <path>\n", argv[0]);
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return EXIT_FAILURE;
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}
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path = argv[1];
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/* attributes: EFI_VARIABLE_NON_VOLATILE |
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* EFI_VARIABLE_BOOTSERVICE_ACCESS |
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* EFI_VARIABLE_RUNTIME_ACCESS
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*/
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*(uint32_t *)buf = 0x7;
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buf[4] = 0;
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/* create a test variable */
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fd = open(path, O_WRONLY | O_CREAT);
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if (fd < 0) {
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perror("open(O_WRONLY)");
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return EXIT_FAILURE;
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}
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rc = write(fd, buf, sizeof(buf));
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if (rc != sizeof(buf)) {
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perror("write");
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return EXIT_FAILURE;
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}
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close(fd);
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fd = open(path, O_RDONLY);
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if (fd < 0) {
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perror("open");
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return EXIT_FAILURE;
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}
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if (unlink(path) < 0) {
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perror("unlink");
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return EXIT_FAILURE;
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}
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rc = read(fd, buf, sizeof(buf));
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if (rc > 0) {
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fprintf(stderr, "reading from an unlinked variable "
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"shouldn't be possible\n");
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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