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Index: bin/dd/args.c
===================================================================
--- bin/dd/args.c
+++ bin/dd/args.c
@@ -320,6 +320,7 @@
{ "ascii", C_ASCII, C_EBCDIC, e2a_POSIX },
{ "block", C_BLOCK, C_UNBLOCK, NULL },
{ "ebcdic", C_EBCDIC, C_ASCII, a2e_POSIX },
+ { "fsync", C_FSYNC, 0, NULL },
{ "ibm", C_EBCDIC, C_ASCII, a2ibm_POSIX },
{ "lcase", C_LCASE, C_UCASE, NULL },
{ "noerror", C_NOERROR, 0, NULL },
Index: bin/dd/dd.h
===================================================================
--- bin/dd/dd.h
+++ bin/dd/dd.h
@@ -101,6 +101,7 @@
#define C_NOXFER 0x10000000
#define C_NOINFO 0x20000000
#define C_PROGRESS 0x40000000
+#define C_FSYNC 0x80000000
#define C_PARITY (C_PAREVEN | C_PARODD | C_PARNONE | C_PARSET)
Index: bin/dd/dd.1
===================================================================
--- bin/dd/dd.1
+++ bin/dd/dd.1
@@ -252,6 +252,10 @@
and
.No pre- Ns Bx 4.3 reno
systems.
+.It Cm fsync
+Perform an
+.Xr fsync 2
+on the output file before closing it.
.It Cm lcase
Transform uppercase characters into lowercase characters.
.It Cm pareven , parnone , parodd , parset
Index: bin/dd/dd.c
===================================================================
--- bin/dd/dd.c
+++ bin/dd/dd.c
@@ -164,6 +164,8 @@
errx(1, "files is not supported for non-tape devices");
cap_rights_set(&rights, CAP_FTRUNCATE, CAP_IOCTL, CAP_WRITE);
+ if (ddflags & C_FSYNC)
+ cap_rights_set(&rights, CAP_FSYNC);
if (out.name == NULL) {
/* No way to check for read access here. */
out.fd = STDOUT_FILENO;
@@ -505,6 +507,11 @@
if (ftruncate(out.fd, out.seek_offset) == -1)
err(1, "truncating %s", out.name);
}
+
+ if (ddflags & C_FSYNC) {
+ if (fsync(out.fd) == -1)
+ err(1, "fsyncing %s", out.name);
+ }
}
void

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