nginx/src/os/unix/ngx_readv_chain.c

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#include <ngx_config.h>
#include <ngx_core.h>
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#include <ngx_event.h>
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ssize_t ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *entry)
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{
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ssize_t n;
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struct iovec *iov;
ngx_err_t err;
ngx_array_t io;
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#if (NGX_SUPPRESS_WARN)
iov = NULL;
#endif
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ngx_init_array(io, c->pool, 10, sizeof(struct iovec), NGX_ERROR);
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while (entry) {
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ngx_test_null(iov, ngx_push_array(&io), NGX_ERROR);
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iov->iov_base = entry->hunk->pos;
iov->iov_len = entry->hunk->end - entry->hunk->last;
entry = entry->next;
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}
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ngx_log_debug(c->log, "recv: %d:%d" _ io.nelts _ iov->iov_len);
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n = readv(c->fd, (struct iovec *) io.elts, io.nelts);
ngx_destroy_array(&io);
if (n == -1) {
c->read->ready = 0;
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err = ngx_errno;
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if (err == NGX_EAGAIN) {
ngx_log_error(NGX_LOG_INFO, c->log, err, "readv() returned EAGAIN");
return NGX_AGAIN;
}
ngx_log_error(NGX_LOG_ERR, c->log, err, "readv() failed");
return NGX_ERROR;
}
return n;
}