https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221331
Oleksandr Tymoshenko <go...@freebsd.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |d...@freebsd.org
Component|Documentation |Manual Pages
Assignee|d...@freebsd.org |b...@freebsd.org
WHR <msl0000023...@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |msl0000023...@gmail.com
--- Comment #1 from WHR <msl0000023...@gmail.com> ---
There was a case that unlink(2) may return EISDIR.
Function kern_unlinkat calls namei(9) to find the parent directory of the file;
it will return EISDIR if the requested path was '/'.
Since '/' isn't a real link (but '/.' and '/..'), it can't be unlinked anyways.
Test:
# cat unlink.c
#include <unistd.h>
#include <stdio.h>
int main(int argc, char **argv) {
if(argc != 2) {
fprintf(stderr, "Usage: %s <path>\n", argv[0]);
return -1;
}
if(unlink(argv[1]) < 0) {
perror(argv[1]);
return 1;
}
return 0;
}
# gcc -Wall -O1 unlink.c -o unlink
# ./unlink /etc/
/etc/: Operation not permitted
# ./unlink /.
/.: Operation not permitted
# ./unlink /
/: Is a directory
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