[PATCH 2/4] tools/bpf: musl compat: do not use DEFFILEMODE

From: Dominique Martinet
Date: Sun Apr 24 2022 - 01:11:04 EST

DEFFILEMODE is not defined on musl libc.

Linus has expressed preference towards using explicit octal value in
the past over combinaisons of S_Ix{USR,GRP,OTH}, so just replace it
with 0666 directly

Signed-off-by: Dominique Martinet <asmadeus@xxxxxxxxxxxxx>

I wanted to link to the Linus mail that said this, but it turns out
there weren't any list in Cc... I could be making this up but here's the
relevant part of his mail, which I hope is acceptable to forward as
there's nothing personal in it:
Date: Sat, 27 Feb 2021 11:29:31 -0800
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: [RFC][PATCHSET] inode type bits fixes
Message-ID: <CAHk-=whRkLinjW3gRJQ=fWHZcFP5iy37+4VVr38TzSXEwZrZGg@xxxxxxxxxxxxxx>


Finally, I absolutely _abhor_ the crazy "S_%&^%&^$" macros. They are
completely illegible garbage, imnsho. I'm looking at that

+ mode = stat->st_mode & S_IALLUGO;
+ mode |= inode->i_mode & ~S_IALLUGO;

and I'm like "WTF is that random character sequence again".

In this case, it's everything but the format. I think it would be
more legible written the other way around, ie

+ mode = stat->st_mode & ~S_IFMT;
+ mode |= inode->i_mode & S_IFMT;

because at least that one has _less_ of the stupid random-generated letters.

Every single one of the "UGO" things are pure and utter crap. The
octal representation of the actual permissions masks are _way_ more
legible than the insane "standard" names for them.

tools/bpf/bpf_jit_disasm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/bpf/bpf_jit_disasm.c b/tools/bpf/bpf_jit_disasm.c
index c8ae95804728..f748863e294c 100644
--- a/tools/bpf/bpf_jit_disasm.c
+++ b/tools/bpf/bpf_jit_disasm.c
@@ -303,7 +303,7 @@ int main(int argc, char **argv)
goto done;

- ofd = open(ofile, O_WRONLY | O_CREAT | O_TRUNC, DEFFILEMODE);
+ ofd = open(ofile, O_WRONLY | O_CREAT | O_TRUNC, 0666);
if (ofd < 0) {
fprintf(stderr, "Could not open file %s for writing: ", ofile);