From 4abab5ad6c8465a7528ccdd5f49367da05f78bbd Mon Sep 17 00:00:00 2001 From: Vladimir Azarov Date: Tue, 1 Oct 2024 15:47:05 +0200 Subject: Initial version --- src/network/sendmsg.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 src/network/sendmsg.c (limited to 'src/network/sendmsg.c') diff --git a/src/network/sendmsg.c b/src/network/sendmsg.c new file mode 100644 index 0000000..acdfdf2 --- /dev/null +++ b/src/network/sendmsg.c @@ -0,0 +1,32 @@ +#include +#include +#include +#include +#include "syscall.h" + +ssize_t sendmsg(int fd, const struct msghdr *msg, int flags) +{ +#if LONG_MAX > INT_MAX + struct msghdr h; + /* Kernels before 2.6.38 set SCM_MAX_FD to 255, allocate enough + * space to support an SCM_RIGHTS ancillary message with 255 fds. + * Kernels since 2.6.38 set SCM_MAX_FD to 253. */ + struct cmsghdr chbuf[CMSG_SPACE(255*sizeof(int))/sizeof(struct cmsghdr)+1], *c; + if (msg) { + h = *msg; + h.__pad1 = h.__pad2 = 0; + msg = &h; + if (h.msg_controllen) { + if (h.msg_controllen > sizeof chbuf) { + errno = ENOMEM; + return -1; + } + memcpy(chbuf, h.msg_control, h.msg_controllen); + h.msg_control = chbuf; + for (c=CMSG_FIRSTHDR(&h); c; c=CMSG_NXTHDR(&h,c)) + c->__pad1 = 0; + } + } +#endif + return socketcall_cp(sendmsg, fd, msg, flags, 0, 0, 0); +} -- cgit v1.2.3