37 lines
1.5 KiB
Plaintext
37 lines
1.5 KiB
Plaintext
sendto
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======
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:title: Shellcode Compiler Runtime
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---------------------------------------------
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ssize_t sendto(int fd, const void* buf, size_t n, int flags, const struct sockaddr* addr, socklen_t addrlen);
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---------------------------------------------
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Sends `n` bytes from the buffer `buf` over the socket `fd`. If `addr` is not `NULL`, specifies the address that the
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data will be sent to. Returns the number of bytes sent, or the negation of the error code on error. It is possible
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for the number of bytes sent to be smaller than the number of bytes requested.
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The supported address types for the `addr` parameter are below:
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---------------------------------------------
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struct sockaddr_in;
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struct sockaddr_in6;
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struct sockaddr_un;
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---------------------------------------------
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IMPORTANT: The socket family member of the address structure must use the `AF_*` constants. The
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`PF_*` constants must only be used when creating sockets. This is to automatically set the length
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field present only on BSD. The length fields are not explicitly present in this runtime.
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IMPORTANT: If the system call is interrupted, this function will return `-EINTR`. This differs from most C runtimes,
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where `-1` is returned with `errno` set to `EINTR`. As this runtime does not have `errno`, callers should check
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for `-EINTR` and a result less than zero in the error checking code.
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See also
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--------
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link:recv.html[recv],
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link:recv_all.html[recv_all],
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link:recvfrom.html[recvfrom],
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link:send.html[send],
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link:send_all.html[send_all],
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link:send_string.html[send_string]
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