When in lazyload mode, write the DOF to a temporary file and rename it

rather than writing directly to the output file.

CID:	1147172

1 files changed, 16 insertions, 13 deletions

diff --git a/cddl/contrib/opensolaris/lib/libdtrace/common/dt_link.c b/cddl/contrib/opensolaris/lib/libdtrace/common/dt_link.c
index eaf0961..af57e39 100644
--- a/cddl/contrib/opensolaris/lib/libdtrace/common/dt_link.c
+++ b/cddl/contrib/opensolaris/lib/libdtrace/common/dt_link.c
@@ -1785,17 +1785,11 @@ dtrace_program_link(dtrace_hdl_t *dtp, dtrace_prog_t *pgp, uint_t dflags,
 		    "failed to open %s: %s", file, strerror(errno)));
 	}
 #else
-	if (dtp->dt_lazyload) {
-		if ((fd = open(file, O_RDWR | O_CREAT | O_TRUNC, 0666)) < 0)
-			return (dt_link_error(dtp, NULL, -1, NULL,
-			    "failed to open %s: %s", file, strerror(errno)));
-	} else {
-		snprintf(tfile, sizeof(tfile), "%s.XXXXXX", file);
-		if ((fd = mkstemp(tfile)) == -1)
-			return (dt_link_error(dtp, NULL, -1, NULL,
-			    "failed to create temporary file %s: %s",
-			    tfile, strerror(errno)));
-	}
+	snprintf(tfile, sizeof(tfile), "%s.XXXXXX", file);
+	if ((fd = mkostemp(tfile, O_CLOEXEC)) == -1)
+		return (dt_link_error(dtp, NULL, -1, NULL,
+		    "failed to create temporary file %s: %s",
+		    tfile, strerror(errno)));
 #endif
 
 	/*
@@ -1951,14 +1945,23 @@ dtrace_program_link(dtrace_hdl_t *dtp, dtrace_prog_t *pgp, uint_t dflags,
 		}
 #endif
 	} else {
+#ifdef __FreeBSD__
+		if (rename(tfile, file) != 0) {
+			ret = dt_link_error(dtp, NULL, fd, NULL,
+			    "failed to rename %s to %s: %s", tfile, file,
+			    strerror(errno));
+			goto done;
+		}
+#endif
 		(void) close(fd);
 	}
 
 done:
 	dtrace_dof_destroy(dtp, dof);
 
-#ifndef illumos
-	unlink(tfile);
+#ifdef illumos
+	if (!dtp->dt_lazyload)
+		(void) unlink(tfile);
 #endif
 	return (ret);
 }