splatink/lbmk
1
0
Fork 0
mirror of https://codeberg.org/libreboot/lbmk.git synced 2026-03-25 13:29:03 +02:00
Code Issues Packages Projects Releases Wiki Activity

util/nvmutil: support real pwrite/pread

Browse Source 
build flag

Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-14 15:52:10 +00:00
parent 6d456e403b
commit 144965d9e6
1 changed files with 22 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
util/nvmutil/nvmutil.c
View File

@@ -1868,7 +1868,9 @@ err_rw_file_once:
*
* This limitation is acceptable, since nvmutil is
* single-threaded. Portability is the main goal.
* If you need real pwrite/pread, just edit prw()
*
* If you need real pwrite/pread, just compile
* with flag: HAVE_REAL_PREAD_PWRITE=1
*
* A fallback is provided for regular read/write.
* rw_type can be IO_READ, IO_WRITE, IO_PREAD
@@ -1915,10 +1917,21 @@ prw(int fd, void *mem, size_t nrw,
try_rw_again:
if (!positional_rw) {
#if defined(HAVE_REAL_PREAD_PWRITE) && \
HAVE_REAL_PREAD_PWRITE > 0
real_pread_pwrite:
#endif
if (rw_type == IO_WRITE)
r = write(fd, mem, nrw);
else if (rw_type == IO_READ)
r = read(fd, mem, nrw);
#if defined(HAVE_REAL_PREAD_PWRITE) && \
HAVE_REAL_PREAD_PWRITE > 0
else if (rw_type == IO_WRITE)
r = pwrite(fd, mem, nrw, off);
else if (rw_type == IO_PREAD)
r = pread(fd, mem, nrw, off);
#endif
if (r == -1 && (errno == try_err(loop_eintr, EINTR)
|| errno == try_err(loop_eagain, EAGAIN)))
@@ -1940,6 +1953,10 @@ try_rw_again:
if (flags & O_APPEND)
goto err_prw;
#if defined(HAVE_REAL_PREAD_PWRITE) && \
HAVE_REAL_PREAD_PWRITE > 0
goto real_pread_pwrite;
#else
if ((off_orig = lseek_loop(fd, (off_t)0, SEEK_CUR,
loop_eagain, loop_eintr)) == (off_t)-1)
r = -1;
@@ -1967,6 +1984,7 @@ try_rw_again:
errno = saved_errno;
return rw_over_nrw(r, nrw);
#endif
err_prw:
errno = EIO;
@@ -2017,6 +2035,8 @@ err_rw_over_nrw:
return -1;
}
#if !defined(HAVE_REAL_PREAD_PWRITE) || \
HAVE_REAL_PREAD_PWRITE < 1
/*
* lseek_loop() does lseek() but optionally
* on an EINTR/EAGAIN wait loop. Used by prw()
@@ -2036,6 +2056,7 @@ lseek_loop(int fd, off_t off, int whence,
return old;
}
#endif
/*
* If a given error loop is enabled,