On Tue, Jun 13, 2017 at 07:04:21PM +0800, JingPiao Chen wrote: > +static void > +test_unix_diag_req(const int fd) > +{ > ... > + /* short read of unix_diag_req */ > + nlh = nlh0 - (sizeof(*req) - 1); > + memmove(nlh, nlh0 - sizeof(*req), NLMSG_HDRLEN + sizeof(*req) - 1); > + > + rc = sendto(fd, nlh, NLMSG_HDRLEN + sizeof(*req), MSG_DONTWAIT, > + NULL, 0); > + > + printf("sendto(%d, {{len=%u, type=SOCK_DIAG_BY_FAMILY" > + ", flags=NLM_F_REQUEST, seq=0, pid=0}, {family=AF_UNIX, %p}}" > + ", %u, MSG_DONTWAIT, NULL, 0) = %s\n", > + fd, NLMSG_HDRLEN + (unsigned int) sizeof(*req), > + NLMSG_DATA(nlh) + 1, > + NLMSG_HDRLEN + (unsigned int) sizeof(*req), > + sprintrc(rc)); > +} > > When (sizeof(*req) - 1 - sizeof(*family) > DEFAULT_STRLEN), the test will > fail.
Why? In this part of the test strace is expected to print a pointer, not a string, so it shouldn't be affected by DEFAULT_STRLEN. -- ldv
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