diff options
Diffstat (limited to 'bin/dd/dd.c')
| -rw-r--r-- | bin/dd/dd.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/bin/dd/dd.c b/bin/dd/dd.c index 64484bd7d564..7977d18b4bfc 100644 --- a/bin/dd/dd.c +++ b/bin/dd/dd.c @@ -143,6 +143,7 @@ static void setup(void) { u_int cnt; + int oflags; cap_rights_t rights; unsigned long cmds[] = { FIODTYPE, MTIOCTOP }; @@ -171,17 +172,28 @@ setup(void) /* No way to check for read access here. */ out.fd = STDOUT_FILENO; out.name = "stdout"; + if (ddflags & C_OFSYNC) { + oflags = fcntl(out.fd, F_GETFL); + if (oflags == -1) + err(1, "unable to get fd flags for stdout"); + oflags |= O_FSYNC; + if (fcntl(out.fd, F_SETFL, oflags) == -1) + err(1, "unable to set fd flags for stdout"); + } } else { -#define OFLAGS \ - (O_CREAT | (ddflags & (C_SEEK | C_NOTRUNC) ? 0 : O_TRUNC)) - out.fd = open(out.name, O_RDWR | OFLAGS, DEFFILEMODE); + oflags = O_CREAT; + if (!(ddflags & (C_SEEK | C_NOTRUNC))) + oflags |= O_TRUNC; + if (ddflags & C_OFSYNC) + oflags |= O_FSYNC; + out.fd = open(out.name, O_RDWR | oflags, DEFFILEMODE); /* * May not have read access, so try again with write only. * Without read we may have a problem if output also does * not support seeks. */ if (out.fd == -1) { - out.fd = open(out.name, O_WRONLY | OFLAGS, DEFFILEMODE); + out.fd = open(out.name, O_WRONLY | oflags, DEFFILEMODE); out.flags |= NOREAD; cap_rights_clear(&rights, CAP_READ); } |