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util/nvmutil: clearer error messages on valid_read

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Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-03 23:09:54 +00:00
parent 75bcc46de4
commit ae080c35e4
1 changed files with 12 additions and 7 deletions
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util/nvmutil/nvmutil.c
+12 -7
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@@ -28,7 +28,7 @@ static void set_mac_nib(int, int, uint8_t *);
static uint8_t hextonum(char);
static uint8_t rhex(void);
static void read_urandom(uint8_t *, size_t);
static int valid_read(const char *, ssize_t, size_t, int);
static int valid_read(const char *, ssize_t, size_t, int, const char *);
static int write_mac_part(int);
static void cmd_dump(void);
static void print_mac_address(int);
@@ -252,8 +252,10 @@ read_gbe_part(int p, int invert)
rval = pread(fd, buf + (SIZE_4KB * (p ^ invert)),
SIZE_4KB, p * partsize);
if (valid_read(fname, rval, (ssize_t) SIZE_4KB, retry))
if (valid_read(fname, rval,
(ssize_t) SIZE_4KB, retry, "pread")) {
break;
}
}
swap(p ^ invert); /* handle big-endian host CPU */
@@ -374,23 +376,26 @@ read_urandom(uint8_t *rnum, size_t rsize)
for (retry = 0; retry < (int) MAX_RETRY_READ; retry++) {
rval = read(rfd, (uint8_t *) rnum, rsize);
if (valid_read("/dev/urandom", rval, rsize, retry))
if (valid_read("/dev/urandom", rval, rsize, retry, "read"))
break;
}
}
static int
valid_read(const char *rpath, ssize_t rval, size_t rsize, int retry)
valid_read(const char *rpath, ssize_t rval, size_t rsize,
int retry, const char *readtype)
{
if (rval == (ssize_t) rsize)
return 1; /* Successful read */
if (rval != -1)
err(ECANCELED, "Short read, %zd: %s", rval, rpath);
err(ECANCELED, "Short %s, %zd bytes, on file: %s",
readtype, rval, rpath);
if (errno != EINTR)
err(ECANCELED, "read '%s'", rpath);
err(ECANCELED, "Could not %s file: '%s'", readtype, rpath);
if (retry == MAX_RETRY_READ - 1)
err(EINTR, "read: max retries exceeded: %s", rpath);
err(EINTR, "%s: max retries exceeded on file: %s",
readtype, rpath);
/*
* Bad read, with errno EINTR (syscall interrupted).