Mercurial > gnulib
view tests/test-passfd.c @ 17573:c67bafa8ca26
passfd: give nicer error for recvfd at eof
I noticed that recvfd() fails with errno set to EACCES if the
other end of the socket has closed (such as if it calls _exit());
but "Permission denied" as the strerror() message doesn't read
very well. This improves things to give the nicer message:
"Transport endpoint is not connected".
* lib/passfd.c (recvfd): Fake ENOTCONN if other end closes early.
* tests/test-passfd.c (main): Enhance test to cover this.
Signed-off-by: Eric Blake <eblake@redhat.com>
author | Eric Blake <eblake@redhat.com> |
---|---|
date | Tue, 24 Dec 2013 11:16:07 -0700 |
parents | 639f60219717 |
children | 344018b6e5d7 |
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/* Test of passing file descriptors. Copyright (C) 2011-2013 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include <config.h> #include "passfd.h" #include <errno.h> #include <fcntl.h> #include <signal.h> #include <stdlib.h> #include <stdio.h> #include <unistd.h> #include <sys/types.h> #include <sys/socket.h> #include <sys/stat.h> #include <sys/wait.h> #include "macros.h" int main () { #if HAVE_SOCKETPAIR int pair[2]; int ret; pid_t pid; int status; int fdnull; int fd; struct stat st; # if HAVE_DECL_ALARM /* Avoid hanging on failure. */ int alarm_value = 5; signal (SIGALRM, SIG_DFL); alarm (alarm_value); # endif fdnull = open ("/dev/null", O_RDWR); if (fdnull < 0) { perror ("Could not open /dev/null"); return 1; } ret = socketpair (AF_UNIX, SOCK_STREAM, 0, pair); if (ret < 0) { perror ("socket pair failed"); return 2; } pid = fork (); if (pid == -1) { perror ("fork"); return 3; } if (pid == 0) { ret = sendfd (pair[1], fdnull); if (ret == -1) { perror ("sendfd"); return 64; } return 0; } /* father */ else { ASSERT (close (pair[1]) == 0); fd = recvfd (pair[0], 0); if (fd == -1) { perror ("recvfd"); return 16; } ret = waitpid (pid, &status, 0); if (ret == -1) { perror ("waitpid"); return 17; } ASSERT (ret == pid); if (!WIFEXITED (status)) { fprintf (stderr, "Child does not normally exit\n"); return 65; } ret = WEXITSTATUS (status); if (ret != 0) { fprintf (stderr, "Send fd fail\n"); return ret; } /* try to stat new fd */ ret = fstat (fd, &st); if (ret < 0) { perror ("fstat"); return 80; } /* Check behavior when sender no longer around */ errno = 0; fd = recvfd (pair[0], 0); ASSERT (fd == -1); ASSERT (errno == ENOTCONN); return 0; } #else errno = 0; ASSERT(sendfd (0, 0) == -1); ASSERT(errno == ENOSYS); errno = 0; ASSERT(recvfd (0, 0) == -1); ASSERT(errno == ENOSYS); fputs ("skipping test: socketpair not supported on this system\n", stderr); return 77; #endif }