Last change
on this file since 445 was 444, checked in by coas-nagasima, 4 years ago |
muslのソースコードを追加
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File size:
983 bytes
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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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