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Asked: 2026-06-11T06:50:10+00:00

I am using ssize_t send(int sockfd, const void *buf, size_t len, int flags); from

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I am using ssize_t send(int sockfd, const void *buf, size_t len, int flags); from socket.h file. I have some doubts about it.

Doubt 1:If suppose the string I am passing to send is of length 10 and the length i specified in the third parameter is 15. Then what will send only send 10 chars or it will send 15 chars (which it gets by reading unallocated memory for last 5 chars).
What will happen in the reverse case means if length of second parameter is more than third parameter.

Doubt 2:I am assuming the length of second parameter is equal to third parameter. Now if the second parameter is say – "abc\0def\0qw". Its length is 11. Will send send the whole string or \0 have any of its effect. I think it will send the whole string. How really send works.

If someone know any good source about send, recv which discuss these function in depth pls share.

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1 Answer

  1. Editorial Team

    The send function knows nothing about “strings”. If you give it a pointer, and tell it to send the next 15 bytes after that pointer, then that is EXACTLY what it will try to do. (You may well encounter a Seg-Fault or similar if you give it an inappropriate len value).

    There is no justification for believing that it would stop just because it finds a byte with value 0x00. After all, many network protocols are FILLED with 0x00 all over the place. You can’t have send stopping every time it happens to find that value.

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