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system/dd: align nshlib/cmd_dd

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nshlib/cmd_dd: Retry if read() was interrupted

    Without this patch

      nsh> ls /etc/group | dd | dd
      sh [13:100]
      sh [14:100]
      nsh: dd: read failed: 4
      nsh>

    Signed-off-by: wangjianyu3 <wangjianyu3@xiaomi.com>

Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>
This commit is contained in:
dongjiuzhu1 2025-04-12 18:37:49 +08:00 • committed by Lup Yuen Lee
parent 2a52c4c7f5
commit b608dd0e3f
1 changed files with 6 additions and 1 deletions
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7
system/dd/dd_main.c
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@ -135,6 +135,11 @@ static int dd_read(FAR struct dd_s *dd)
nbytes = read(dd->infd, buffer, dd->sectsize - dd->nbytes);
if (nbytes < 0)
{
if (errno == EINTR)
{
continue;
}
fprintf(stderr, "%s: failed to read: %s\n", g_dd, strerror(errno));
return ERROR;
}
@ -147,7 +152,7 @@ static int dd_read(FAR struct dd_s *dd)
break;
}
}
while (dd->nbytes < dd->sectsize && nbytes > 0);
while (dd->nbytes < dd->sectsize && nbytes != 0);
return OK;
}