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qnx修改tcp和udp缓冲区默认大小

news 2025/8/21 12:04:45

拷贝/home/test/qnx/qos223/target/qnx7/aarch64le/sbin/sysctl进系统中

https://www.qnx.com/developers/docs/7.1/#com.qnx.doc.neutrino.utilities/topic/s/sysctl.html

kern.sbmax 默认262144，这个限制住了发送、接收缓冲器大小

./sysctl -w kern.sbmax=1000000 #to 1M 必须先执行
./sysctl -w net.inet.udp.sendspace=233000
./sysctl -w net.inet.udp.recvspace=233000
./sysctl -w net.inet.tcp.sendspace=233000
./sysctl -w net.inet.tcp.sendspace=233000

另外，可直接修改/etc/inetd.conf

https://www.qnx.com/developers/docs/7.1/#com.qnx.doc.neutrino.utilities/topic/i/inetd.conf.html
在这里插入图片描述

测试c语言函数


/* getsndrcv.c:* getsockopt sample c code* using getsockopt* Get SO_SNDBUF & SO_RCVBUF Options:*/
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
/** This function reports the error and* exits back to the shell:*/
static void displayError(const char *on_what) {if (errno != 0) {fputs(strerror(errno), stderr);fputs(": ", stderr);}fputs(on_what, stderr);fputc('\n', stderr);exit(1);
}
int main(int argc, char **argv) {int z;int s = -1;       /* Socket */int sndbuf = 0;   /* Send buffer size */int rcvbuf = 0;   /* Receive buffer size */socklen_t optlen; /* Option length *//** Create a TDP/IP socket to use:*/s = socket(PF_INET, SOCK_DGRAM, 0);/*s = socket(PF_INET,SOCK_DGRAM,0);  udp使用本行代码*/if (s == -1) {displayError("socket(2)");}/** Get socket option SO_SNDBUF:*/optlen = sizeof sndbuf;z = getsockopt(s, SOL_SOCKET, SO_SNDBUF, &sndbuf, &optlen);if (z) {displayError("getsockopt(s,SOL_SOCKET,""SO_SNDBUF)");}assert(optlen == sizeof sndbuf);/** Get socket option SO_SNDBUF:*/optlen = sizeof rcvbuf;z = getsockopt(s, SOL_SOCKET, SO_RCVBUF, &rcvbuf, &optlen);if (z) {displayError("getsockopt(s,SOL_SOCKET,""SO_RCVBUF)");}assert(optlen == sizeof rcvbuf);/** Report the buffer sizes:*/printf("Socket s : %d\n", s);printf("Send buf: %d bytes\n", sndbuf);printf("Recv buf: %d bytes\n", rcvbuf);close(s);return 0;
}
/** OUTPUT*[sgupta@rhel54x64 socket]$ gcc getsndrcv.c -o getsndrcv -lsocket[sgupta@rhel54x64 socket]$ ./getsndrcvSocket s : 3Send buf: 16384 bytesRecv buf: 87380 bytes[sgupta@rhel54x64 socket]$*/