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util/nvmutil: portable pread/pwrite

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not thread-safe

lucky we're single-threaded!

Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-10 09:04:20 +00:00
parent 5ae5d53751
commit 21f8d323f4
1 changed files with 20 additions and 6 deletions
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util/nvmutil/nvmutil.c
+20 -6
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@@ -216,6 +216,7 @@ static void rw_file_exact(int fd, uint8_t *mem, size_t len,
off_t off, int rw_type, const char *path, const char *rw_type_str); off_t off, int rw_type, const char *path, const char *rw_type_str);
static ssize_t prw(int fd, void *mem, size_t count, static ssize_t prw(int fd, void *mem, size_t count,
off_t offset, int rw_type, const char *path); off_t offset, int rw_type, const char *path);
static off_t lseek_eintr(int fd, off_t offset, int whence);
/* /*
* Error handling and cleanup * Error handling and cleanup
@@ -1397,14 +1398,13 @@ static ssize_t
prw(int fd, void *mem, size_t count, prw(int fd, void *mem, size_t count,
off_t offset, int rw_type, const char *path) off_t offset, int rw_type, const char *path)
{ {
off_t rs;
off_t old; off_t old;
ssize_t r; ssize_t r;
old = lseek(fd, 0, SEEK_CUR); if ((old = lseek_eintr(fd, (off_t)0, SEEK_CUR)) == (off_t)-1)
if (old == (off_t)-1)
return -1; return -1;
if ((r = lseek_eintr(fd, offset, SEEK_SET)) == (off_t)-1)
if (lseek(fd, offset, SEEK_SET) == (off_t)-1)
return -1; return -1;
do { do {
@@ -1416,12 +1416,26 @@ prw(int fd, void *mem, size_t count,
err(EIO, "%s: Invalid rw_type", path); err(EIO, "%s: Invalid rw_type", path);
} while (r < 0 && errno == EINTR); } while (r < 0 && errno == EINTR);
if (lseek(fd, old, SEEK_SET) == (off_t)-1 && r >= 0) if (r >= 0) {
errno = EIO; if ((rs = lseek_eintr(fd, old, SEEK_SET)) == (off_t)-1)
errno = EIO;
}
return r; return r;
} }
static off_t
lseek_eintr(int fd, off_t offset, int whence)
{
off_t old;
do {
old = lseek(fd, offset, whence);
} while (old == (off_t)-1 && errno == EINTR);
return old;
}
static void static void
err(int nvm_errval, const char *msg, ...) err(int nvm_errval, const char *msg, ...)
{ {