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| author | Leah Rowe <leah@libreboot.org> | 2026-03-10 10:26:12 +0000 |
|---|---|---|
| committer | Leah Rowe <leah@libreboot.org> | 2026-03-10 10:26:12 +0000 |
| commit | 91a6395e5cbfd70f5227d1a6b347444dcb7dea5f (patch) | |
| tree | e63335109ceb9d9db5be8e6da0354dbe6e8c3fc1 /util/nvmutil | |
| parent | 5a005eff9e404873876ec676917f55f27333ddf5 (diff) | |
util/nvmutil: preserve errno during i/o
do not clobber errno
yeah we're basically being libc now
Signed-off-by: Leah Rowe <leah@libreboot.org>
Diffstat (limited to 'util/nvmutil')
| -rw-r--r-- | util/nvmutil/nvmutil.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/util/nvmutil/nvmutil.c b/util/nvmutil/nvmutil.c index 2bc74615..71e16f46 100644 --- a/util/nvmutil/nvmutil.c +++ b/util/nvmutil/nvmutil.c @@ -1372,6 +1372,7 @@ prw(int fd, void *mem, size_t count, { off_t old; ssize_t r; + int saved_errno = 0; if ((old = lseek_eintr(fd, (off_t)0, SEEK_CUR)) == (off_t)-1) return -1; @@ -1388,9 +1389,15 @@ prw(int fd, void *mem, size_t count, err(EIO, "%s: Invalid rw_type", path); } while (r < 0 && errno == EINTR); + if (r < 0) + saved_errno = errno; + if (lseek_eintr(fd, old, SEEK_SET) == (off_t)-1) return -1; + if (r < 0) + errno = saved_errno; + return r; } |