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perf symbol-elf: Add support for the block argument for libbfd

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James Clark caught that the BUILD_NONDISTRO=1 build with libbfd was
broken due to an update to the read_build_id function adding a
blocking argument. Add support for this argument by first opening the
file blocking or non-blocking, then switching from bfd_openr to
bfd_fdopenr and passing the opened fd. bfd_fdopenr closes the fd on
error and when bfd_close are called.

Reported-by: James Clark <james.clark@linaro.org>
Closes: https://lore.kernel.org/lkml/20250903-james-perf-read-build-id-fix-v1-2-6a694d0a980f@linaro.org/
Fixes: 2c369d91d0 ("perf symbol: Add blocking argument to filename__read_build_id")
Signed-off-by: Ian Rogers <irogers@google.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Link: https://lore.kernel.org/r/20250904161731.1193729-1-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Ian Rogers
2025-09-04 09:17:31 -07:00
committed by Namhyung Kim
parent 744175e972
commit ca81e74dc3
1 changed files with 7 additions and 3 deletions
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10
tools/perf/util/symbol-elf.c
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@@ -873,13 +873,17 @@ static int elf_read_build_id(Elf *elf, void *bf, size_t size)
#ifdef HAVE_LIBBFD_BUILDID_SUPPORT
static int read_build_id(const char *filename, struct build_id *bid)
static int read_build_id(const char *filename, struct build_id *bid, bool block)
{
size_t size = sizeof(bid->data);
int err = -1;
int err = -1, fd;
bfd *abfd;
abfd = bfd_openr(filename, NULL);
fd = open(filename, block ? O_RDONLY : (O_RDONLY | O_NONBLOCK));
if (fd < 0)
return -1;
abfd = bfd_fdopenr(filename, /*target=*/NULL, fd);
if (!abfd)
return -1;