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libbpf: preserve errno before calling into user callback

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pr_warning ultimately may call into user-provided callback function,
which can clobber errno value, so we need to save it before that.

Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Andrii Nakryiko
2019-05-29 10:36:04 -07:00
committed by Andrii Nakryiko
parent 1aedc35d5d
commit 64852b2fb9
1 changed files with 4 additions and 4 deletions
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8
src/libbpf.c
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@@ -565,12 +565,12 @@ static int bpf_object__elf_init(struct bpf_object *obj)
} else { } else {
obj->efile.fd = open(obj->path, O_RDONLY); obj->efile.fd = open(obj->path, O_RDONLY);
if (obj->efile.fd < 0) { if (obj->efile.fd < 0) {
char errmsg[STRERR_BUFSIZE]; char errmsg[STRERR_BUFSIZE], *cp;
char *cp = libbpf_strerror_r(errno, errmsg,
sizeof(errmsg));
err = -errno;
cp = libbpf_strerror_r(err, errmsg, sizeof(errmsg));
pr_warning("failed to open %s: %s\n", obj->path, cp); pr_warning("failed to open %s: %s\n", obj->path, cp);
return -errno; return err;
} }
obj->efile.elf = elf_begin(obj->efile.fd, obj->efile.elf = elf_begin(obj->efile.fd,