Last change
on this file since 388 was 388, checked in by coas-nagasima, 5 years ago |
Azure IoT Hub Device C SDK を使ったサンプルの追加
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Property svn:eol-style
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Property svn:keywords
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Id
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Property svn:mime-type
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text/x-csrc
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File size:
983 bytes
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Rev | Line | |
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[388] | 1 | #define _GNU_SOURCE
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| 2 | #include <sys/socket.h>
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| 3 | #include <limits.h>
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| 4 | #include <errno.h>
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| 5 | #include "syscall.h"
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| 6 |
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| 7 | int sendmmsg(int fd, struct mmsghdr *msgvec, unsigned int vlen, unsigned int flags)
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| 8 | {
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| 9 | #if LONG_MAX > INT_MAX
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| 10 | /* Can't use the syscall directly because the kernel has the wrong
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| 11 | * idea for the types of msg_iovlen, msg_controllen, and cmsg_len,
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| 12 | * and the cmsg blocks cannot be modified in-place. */
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| 13 | int i;
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| 14 | if (vlen > IOV_MAX) vlen = IOV_MAX; /* This matches the kernel. */
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| 15 | if (!vlen) return 0;
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| 16 | for (i=0; i<vlen; i++) {
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| 17 | /* As an unfortunate inconsistency, the sendmmsg API uses
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| 18 | * unsigned int for the resulting msg_len, despite sendmsg
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| 19 | * returning ssize_t. However Linux limits the total bytes
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| 20 | * sent by sendmsg to INT_MAX, so the assignment is safe. */
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| 21 | ssize_t r = sendmsg(fd, &msgvec[i].msg_hdr, flags);
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| 22 | if (r < 0) goto error;
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| 23 | msgvec[i].msg_len = r;
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| 24 | }
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| 25 | error:
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| 26 | return i ? i : -1;
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| 27 | #else
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| 28 | return syscall_cp(SYS_sendmmsg, fd, msgvec, vlen, flags);
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| 29 | #endif
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| 30 | }
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