d974f67a52
Test that reads from a newly-created efivarfs file (with no data written) will return EOF. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Cc: Matt Fleming <matt.fleming@intel.com> Cc: Lingzhu Xiang <lxiang@redhat.com> Cc: Dave Young <dyoung@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
39 lines
679 B
C
39 lines
679 B
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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#include <errno.h>
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#include <string.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[4];
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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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/* create a test variable */
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fd = open(path, O_RDWR | O_CREAT, 0600);
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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 = read(fd, buf, sizeof(buf));
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if (rc != 0) {
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fprintf(stderr, "Reading a new var should return EOF\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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