gnulib: lib/passfd.c annotate

annotate lib/passfd.c @ 40186:8964917f9574

autoupdate

author	Karl Berry <karl@freefriends.org>
date	Mon, 18 Feb 2019 08:02:49 -0800
parents	b06060465f09
children

rev	line source
40057 b06060465f09 maint: Run 'make update-copyright' Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	1 /* Copyright (C) 2011-2019 Free Software Foundation, Inc.
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	2
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	3 This program is free software: you can redistribute it and/or modify
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	4 it under the terms of the GNU General Public License as published by
14420 08622275f761 passfd module, part 2, tweaks. Bruno Haible <bruno@clisp.org> parents: 14419 diff changeset	5 the Free Software Foundation; either version 3 of the License, or
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	6 (at your option) any later version.
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	7
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	8 This program is distributed in the hope that it will be useful,
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	9 but WITHOUT ANY WARRANTY; without even the implied warranty of
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	11 GNU General Public License for more details.
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	12
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	13 You should have received a copy of the GNU General Public License
19190 9759915b2aca all: prefer https: URLs Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	14 along with this program. If not, see <https://www.gnu.org/licenses/>. */
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	15
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	16 #include <config.h>
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	17
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	18 /* Specification. */
14420 08622275f761 passfd module, part 2, tweaks. Bruno Haible <bruno@clisp.org> parents: 14419 diff changeset	19 #include "passfd.h"
08622275f761 passfd module, part 2, tweaks. Bruno Haible <bruno@clisp.org> parents: 14419 diff changeset	20
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	21 #include <errno.h>
14421 f23a6a383241 passfd module, part 3. Bastien Roucariès <roucaries.bastien@gmail.com> parents: 14420 diff changeset	22 #include <fcntl.h>
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	23 #include <stddef.h>
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	24 #include <stdlib.h>
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	25 #include <string.h>
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	26 #include <sys/types.h>
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	27 #include <unistd.h>
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	28
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	29 #include <sys/socket.h>
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	30
14421 f23a6a383241 passfd module, part 3. Bastien Roucariès <roucaries.bastien@gmail.com> parents: 14420 diff changeset	31 #include "cloexec.h"
f23a6a383241 passfd module, part 3. Bastien Roucariès <roucaries.bastien@gmail.com> parents: 14420 diff changeset	32
14663 d426501f792a passfd: Add comments. Bruno Haible <bruno@clisp.org> parents: 14626 diff changeset	33 /* The code that uses CMSG_FIRSTHDR is enabled on
16935 498a2211d839 Write "Mac OS X" instead of "MacOS X". Bruno Haible <bruno@clisp.org> parents: 16201 diff changeset	34 Linux, Mac OS X, FreeBSD, OpenBSD, NetBSD, AIX, OSF/1, Cygwin.
14663 d426501f792a passfd: Add comments. Bruno Haible <bruno@clisp.org> parents: 14626 diff changeset	35 The code that uses HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS is enabled on
d426501f792a passfd: Add comments. Bruno Haible <bruno@clisp.org> parents: 14626 diff changeset	36 HP-UX, IRIX, Solaris. */
d426501f792a passfd: Add comments. Bruno Haible <bruno@clisp.org> parents: 14626 diff changeset	37
d426501f792a passfd: Add comments. Bruno Haible <bruno@clisp.org> parents: 14626 diff changeset	38 /* MSG_CMSG_CLOEXEC is defined only on Linux, as of 2011. */
14509 509ee86b2306 passfd: standardize coding conventions Eric Blake <eblake@redhat.com> parents: 14508 diff changeset	39 #ifndef MSG_CMSG_CLOEXEC
509ee86b2306 passfd: standardize coding conventions Eric Blake <eblake@redhat.com> parents: 14508 diff changeset	40 # define MSG_CMSG_CLOEXEC 0
509ee86b2306 passfd: standardize coding conventions Eric Blake <eblake@redhat.com> parents: 14508 diff changeset	41 #endif
509ee86b2306 passfd: standardize coding conventions Eric Blake <eblake@redhat.com> parents: 14508 diff changeset	42
14599 2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	43 #if HAVE_SENDMSG
14420 08622275f761 passfd module, part 2, tweaks. Bruno Haible <bruno@clisp.org> parents: 14419 diff changeset	44 /* sendfd sends the file descriptor fd along the socket
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	45 to a process calling recvfd on the other end.
14420 08622275f761 passfd module, part 2, tweaks. Bruno Haible <bruno@clisp.org> parents: 14419 diff changeset	46
08622275f761 passfd module, part 2, tweaks. Bruno Haible <bruno@clisp.org> parents: 14419 diff changeset	47 Return 0 on success, or -1 with errno set in case of error.
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	48 */
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	49 int
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	50 sendfd (int sock, int fd)
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	51 {
14626 0f3fba4a62b1 passfd: avoid compiler warning Eric Blake <eblake@redhat.com> parents: 14600 diff changeset	52 char byte = 0;
14509 509ee86b2306 passfd: standardize coding conventions Eric Blake <eblake@redhat.com> parents: 14508 diff changeset	53 struct iovec iov;
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	54 struct msghdr msg;
14600 f57a9fcc777a passfd: speed up configure and drop unused code Eric Blake <eblake@redhat.com> parents: 14599 diff changeset	55 # ifdef CMSG_FIRSTHDR
14510 9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	56 struct cmsghdr *cmsg;
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	57 char buf[CMSG_SPACE (sizeof fd)];
14599 2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	58 # endif
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	59
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	60 /* send at least one char */
14508 6bacc85ddf06 passfd: fix incorrect sendmsg arguments Eric Blake <eblake@redhat.com> parents: 14427 diff changeset	61 memset (&msg, 0, sizeof msg);
14626 0f3fba4a62b1 passfd: avoid compiler warning Eric Blake <eblake@redhat.com> parents: 14600 diff changeset	62 iov.iov_base = &byte;
14509 509ee86b2306 passfd: standardize coding conventions Eric Blake <eblake@redhat.com> parents: 14508 diff changeset	63 iov.iov_len = 1;
509ee86b2306 passfd: standardize coding conventions Eric Blake <eblake@redhat.com> parents: 14508 diff changeset	64 msg.msg_iov = &iov;
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	65 msg.msg_iovlen = 1;
14509 509ee86b2306 passfd: standardize coding conventions Eric Blake <eblake@redhat.com> parents: 14508 diff changeset	66 msg.msg_name = NULL;
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	67 msg.msg_namelen = 0;
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	68
14600 f57a9fcc777a passfd: speed up configure and drop unused code Eric Blake <eblake@redhat.com> parents: 14599 diff changeset	69 # ifdef CMSG_FIRSTHDR
14510 9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	70 msg.msg_control = buf;
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	71 msg.msg_controllen = sizeof buf;
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	72 cmsg = CMSG_FIRSTHDR (&msg);
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	73 cmsg->cmsg_level = SOL_SOCKET;
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	74 cmsg->cmsg_type = SCM_RIGHTS;
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	75 cmsg->cmsg_len = CMSG_LEN (sizeof fd);
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	76 /* Initialize the payload: */
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	77 memcpy (CMSG_DATA (cmsg), &fd, sizeof fd);
17934 b4da4a9fe406 passfd: avoid valgrind uninitalised data warning Pavel Hrdina <phrdina@redhat.com> parents: 17848 diff changeset	78 msg.msg_controllen = cmsg->cmsg_len;
14600 f57a9fcc777a passfd: speed up configure and drop unused code Eric Blake <eblake@redhat.com> parents: 14599 diff changeset	79 # elif HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
14510 9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	80 msg.msg_accrights = &fd;
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	81 msg.msg_accrightslen = sizeof fd;
14599 2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	82 # else
14510 9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	83 errno = ENOSYS;
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	84 return -1;
14599 2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	85 # endif
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	86
14509 509ee86b2306 passfd: standardize coding conventions Eric Blake <eblake@redhat.com> parents: 14508 diff changeset	87 if (sendmsg (sock, &msg, 0) != iov.iov_len)
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	88 return -1;
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	89 return 0;
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	90 }
14599 2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	91 #else
2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	92 int
2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	93 sendfd (int sock _GL_UNUSED, int fd _GL_UNUSED)
2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	94 {
2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	95 errno = ENOSYS;
2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	96 return -1;
2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	97 }
2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	98 #endif
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	99
14599 2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	100
2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	101 #if HAVE_RECVMSG
14420 08622275f761 passfd module, part 2, tweaks. Bruno Haible <bruno@clisp.org> parents: 14419 diff changeset	102 /* recvfd receives a file descriptor through the socket.
14421 f23a6a383241 passfd module, part 3. Bastien Roucariès <roucaries.bastien@gmail.com> parents: 14420 diff changeset	103 The flags are a bitmask, possibly including O_CLOEXEC (defined in <fcntl.h>).
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	104
17014 dac0cd2e8030 passfd: fix comment on recvfd Eric Blake <eblake@redhat.com> parents: 16935 diff changeset	105 Return the fd on success, or -1 with errno set in case of error.
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	106 */
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	107 int
14421 f23a6a383241 passfd module, part 3. Bastien Roucariès <roucaries.bastien@gmail.com> parents: 14420 diff changeset	108 recvfd (int sock, int flags)
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	109 {
14626 0f3fba4a62b1 passfd: avoid compiler warning Eric Blake <eblake@redhat.com> parents: 14600 diff changeset	110 char byte = 0;
14509 509ee86b2306 passfd: standardize coding conventions Eric Blake <eblake@redhat.com> parents: 14508 diff changeset	111 struct iovec iov;
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	112 struct msghdr msg;
14510 9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	113 int fd = -1;
17573 c67bafa8ca26 passfd: give nicer error for recvfd at eof Eric Blake <eblake@redhat.com> parents: 17249 diff changeset	114 ssize_t len;
14600 f57a9fcc777a passfd: speed up configure and drop unused code Eric Blake <eblake@redhat.com> parents: 14599 diff changeset	115 # ifdef CMSG_FIRSTHDR
14510 9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	116 struct cmsghdr *cmsg;
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	117 char buf[CMSG_SPACE (sizeof fd)];
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	118 int flags_recvmsg = flags & O_CLOEXEC ? MSG_CMSG_CLOEXEC : 0;
14599 2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	119 # endif
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	120
14421 f23a6a383241 passfd module, part 3. Bastien Roucariès <roucaries.bastien@gmail.com> parents: 14420 diff changeset	121 if ((flags & ~O_CLOEXEC) != 0)
f23a6a383241 passfd module, part 3. Bastien Roucariès <roucaries.bastien@gmail.com> parents: 14420 diff changeset	122 {
f23a6a383241 passfd module, part 3. Bastien Roucariès <roucaries.bastien@gmail.com> parents: 14420 diff changeset	123 errno = EINVAL;
f23a6a383241 passfd module, part 3. Bastien Roucariès <roucaries.bastien@gmail.com> parents: 14420 diff changeset	124 return -1;
f23a6a383241 passfd module, part 3. Bastien Roucariès <roucaries.bastien@gmail.com> parents: 14420 diff changeset	125 }
f23a6a383241 passfd module, part 3. Bastien Roucariès <roucaries.bastien@gmail.com> parents: 14420 diff changeset	126
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	127 /* send at least one char */
14510 9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	128 memset (&msg, 0, sizeof msg);
14626 0f3fba4a62b1 passfd: avoid compiler warning Eric Blake <eblake@redhat.com> parents: 14600 diff changeset	129 iov.iov_base = &byte;
14509 509ee86b2306 passfd: standardize coding conventions Eric Blake <eblake@redhat.com> parents: 14508 diff changeset	130 iov.iov_len = 1;
509ee86b2306 passfd: standardize coding conventions Eric Blake <eblake@redhat.com> parents: 14508 diff changeset	131 msg.msg_iov = &iov;
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	132 msg.msg_iovlen = 1;
14509 509ee86b2306 passfd: standardize coding conventions Eric Blake <eblake@redhat.com> parents: 14508 diff changeset	133 msg.msg_name = NULL;
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	134 msg.msg_namelen = 0;
236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	135
14600 f57a9fcc777a passfd: speed up configure and drop unused code Eric Blake <eblake@redhat.com> parents: 14599 diff changeset	136 # ifdef CMSG_FIRSTHDR
14510 9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	137 msg.msg_control = buf;
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	138 msg.msg_controllen = sizeof buf;
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	139 cmsg = CMSG_FIRSTHDR (&msg);
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	140 cmsg->cmsg_level = SOL_SOCKET;
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	141 cmsg->cmsg_type = SCM_RIGHTS;
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	142 cmsg->cmsg_len = CMSG_LEN (sizeof fd);
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	143 /* Initialize the payload: */
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	144 memcpy (CMSG_DATA (cmsg), &fd, sizeof fd);
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	145 msg.msg_controllen = cmsg->cmsg_len;
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	146
17573 c67bafa8ca26 passfd: give nicer error for recvfd at eof Eric Blake <eblake@redhat.com> parents: 17249 diff changeset	147 len = recvmsg (sock, &msg, flags_recvmsg);
c67bafa8ca26 passfd: give nicer error for recvfd at eof Eric Blake <eblake@redhat.com> parents: 17249 diff changeset	148 if (len < 0)
14510 9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	149 return -1;
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	150
14510 9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	151 cmsg = CMSG_FIRSTHDR (&msg);
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	152 /* be paranoiac */
17573 c67bafa8ca26 passfd: give nicer error for recvfd at eof Eric Blake <eblake@redhat.com> parents: 17249 diff changeset	153 if (len == 0 \|\| cmsg == NULL \|\| cmsg->cmsg_len != CMSG_LEN (sizeof fd)
14510 9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	154 \|\| cmsg->cmsg_level != SOL_SOCKET \|\| cmsg->cmsg_type != SCM_RIGHTS)
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	155 {
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	156 /* fake errno: at end the file is not available */
17573 c67bafa8ca26 passfd: give nicer error for recvfd at eof Eric Blake <eblake@redhat.com> parents: 17249 diff changeset	157 errno = len ? EACCES : ENOTCONN;
14510 9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	158 return -1;
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	159 }
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	160
14510 9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	161 memcpy (&fd, CMSG_DATA (cmsg), sizeof fd);
14421 f23a6a383241 passfd module, part 3. Bastien Roucariès <roucaries.bastien@gmail.com> parents: 14420 diff changeset	162
14510 9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	163 /* set close-on-exec flag */
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	164 if (!MSG_CMSG_CLOEXEC && (flags & O_CLOEXEC))
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	165 {
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	166 if (set_cloexec_flag (fd, true) < 0)
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	167 {
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	168 int saved_errno = errno;
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	169 (void) close (fd);
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	170 errno = saved_errno;
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	171 return -1;
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	172 }
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	173 }
14421 f23a6a383241 passfd module, part 3. Bastien Roucariès <roucaries.bastien@gmail.com> parents: 14420 diff changeset	174
14600 f57a9fcc777a passfd: speed up configure and drop unused code Eric Blake <eblake@redhat.com> parents: 14599 diff changeset	175 # elif HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
14510 9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	176 msg.msg_accrights = &fd;
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	177 msg.msg_accrightslen = sizeof fd;
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	178 if (recvmsg (sock, &msg, 0) < 0)
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	179 return -1;
14421 f23a6a383241 passfd module, part 3. Bastien Roucariès <roucaries.bastien@gmail.com> parents: 14420 diff changeset	180
14510 9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	181 /* set close-on-exec flag */
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	182 if (flags & O_CLOEXEC)
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	183 {
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	184 if (set_cloexec_flag (fd, true) < 0)
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	185 {
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	186 int saved_errno = errno;
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	187 close (fd);
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	188 errno = saved_errno;
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	189 return -1;
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	190 }
9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	191 }
14599 2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	192 # else
14510 9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	193 errno = ENOSYS;
14599 2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	194 # endif
14421 f23a6a383241 passfd module, part 3. Bastien Roucariès <roucaries.bastien@gmail.com> parents: 14420 diff changeset	195
14510 9f461c37c0fa passfd: fix scoping bug Eric Blake <eblake@redhat.com> parents: 14509 diff changeset	196 return fd;
14419 236edbfecf1d passfd module, part 2. Bastien Roucariès <roucaries.bastien@gmail.com> parents: diff changeset	197 }
14599 2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	198 #else
2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	199 int
2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	200 recvfd (int sock _GL_UNUSED, int flags _GL_UNUSED)
2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	201 {
2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	202 errno = ENOSYS;
2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	203 return -1;
2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	204 }
2a40136b85ae passfd: allow compilation on mingw Eric Blake <eblake@redhat.com> parents: 14510 diff changeset	205 #endif

Mercurial > gnulib

annotate lib/passfd.c @ 40186:8964917f9574