diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/oldrecvmmsg.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/oldrecvmmsg.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/oldrecvmmsg.c b/sysdeps/unix/sysv/linux/oldrecvmmsg.c new file mode 100644 index 0000000000..4bf849bb58 --- /dev/null +++ b/sysdeps/unix/sysv/linux/oldrecvmmsg.c @@ -0,0 +1,87 @@ +/* Compatibility version of recvmsg. + Copyright (C) 2010-2016 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <sys/socket.h> +#include <sysdep-cancel.h> +#include <socketcall.h> +#include <shlib-compat.h> + +#if __WORDSIZE == 64 +# if SHLIB_COMPAT (libc, GLIBC_2_12, GLIBC_2_24) + +/* Do not use the recvmmsg syscall on socketcall architectures unless + it was added at the same time as the socketcall support or can be + assumed to be present. */ +# if defined __ASSUME_SOCKETCALL \ + && !defined __ASSUME_RECVMMSG_SYSCALL_WITH_SOCKETCALL \ + && !defined __ASSUME_RECVMMSG_SYSCALL +# undef __NR_recvmmsg +# endif + +int +__old_recvmmsg (int fd, struct mmsghdr *vmessages, unsigned int vlen, + int flags, struct timespec *tmo) +{ +# ifdef __NR_recvmmsg + return SYSCALL_CANCEL (recvmmsg, fd, vmessages, vlen, flags, tmo); +# elif defined __NR_socketcall +# ifdef __ASSUME_RECVMMSG_SOCKETCALL + return SOCKETCALL_CANCEL (recvmmsg, fd, vmessages, vlen, flags, tmo); +# else + static int have_recvmmsg; + if (__glibc_likely (have_recvmmsg >= 0)) + { + int ret = SOCKETCALL_CANCEL (recvmmsg, fd, vmessages, vlen, flags, + tmo); + /* The kernel returns -EINVAL for unknown socket operations. + We need to convert that error to an ENOSYS error. */ + if (__builtin_expect (ret < 0, 0) + && have_recvmmsg == 0 + && errno == EINVAL) + { + /* Try another call, this time with an invalid file + descriptor and all other parameters cleared. This call + will not cause any harm and it will return + immediately. */ + ret = SOCKETCALL_CANCEL (invalid, -1); + if (errno == EINVAL) + { + have_recvmmsg = -1; + __set_errno (ENOSYS); + } + else + { + have_recvmmsg = 1; + __set_errno (EINVAL); + } + return -1; + } + return ret; + } + __set_errno (ENOSYS); + return -1; +# endif /* __ASSUME_RECVMMSG_SOCKETCALL */ +# else + __set_errno (ENOSYS); + return -1; +# endif +} +compat_symbol (libc, __old_recvmmsg, recvmmsg, GLIBC_2_12); + +# endif /* SHLIB_COMPAT (libc, GLIBC_2_12, GLIBC_2_24) */ +#endif /* __WORDSIZE == 64 */ |