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kcov-example: Print helpful error if kcov feature is missing

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Ben Wiederhake 2021-11-21 03:35:20 +01:00 • committed by Andreas Kling
parent 253d62cb18
commit d5c687b50f
1 changed files with 1 additions and 0 deletions
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Userland/Utilities/kcov-example.cpp
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@ -21,6 +21,7 @@ int main(void)
int fd = open("/dev/kcov0", O_RDWR); int fd = open("/dev/kcov0", O_RDWR);
if (fd == -1) { if (fd == -1) {
perror("open"); perror("open");
fprintf(stderr, "Could not open /dev/kcov0 - is ENABLE_KERNEL_COVERAGE_COLLECTION enabled?\n");
return 1; return 1;
} }
if (ioctl(fd, KCOV_SETBUFSIZE, num_entries) == -1) { if (ioctl(fd, KCOV_SETBUFSIZE, num_entries) == -1) {