Created
November 19, 2015 16:27
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TCP keepalive test
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# /* | |
this_md5="$(md5sum < "$0" | cut -d' ' -f1)" | |
last_md5="$(readelf -p SOURCE_FILE_HASH "${0%.c}" 2>/dev/null | awk '/\[ *0\]/ { print $3 }')" | |
if [ "$this_md5" != "$last_md5" ]; then | |
gcc -pipe -Wall -Wextra -std=gnu11 -g -march=native -O3 -DTHIS_MD5="\"$this_md5\"" -o "${0%.c}" "$0" || | |
exit 1 | |
fi | |
exec "${0%.c}" "$@" | |
exit 1 | |
# */ | |
#ifndef THIS_MD5 | |
# define THIS_MD5 "not set" | |
#endif | |
char MD5[] __attribute__((section ("SOURCE_FILE_HASH"))) = THIS_MD5; | |
#include <stdlib.h> | |
#include <stdio.h> | |
#include <string.h> | |
#include <unistd.h> | |
#include <sys/types.h> | |
#include <sys/socket.h> | |
#include <netinet/in.h> | |
#include <netinet/tcp.h> | |
int main() | |
{ | |
int s = socket(AF_INET, SOCK_STREAM, 0 ); | |
if( s < 0 ) { | |
perror( "socket" ); | |
return EXIT_FAILURE; | |
} | |
int opt = 1; | |
if( setsockopt( s, SOL_SOCKET, SO_KEEPALIVE, &opt, sizeof(opt) ) < 0 ) { | |
perror( "setsockopt( SO_KEEPALIVE )" ); | |
return EXIT_FAILURE; | |
} | |
opt = 1; | |
if( setsockopt( s, SOL_TCP, TCP_KEEPIDLE, &opt, sizeof(opt) ) < 0 ) { | |
perror( "setsockopt( TCP_KEEPIDLE )" ); | |
return EXIT_FAILURE; | |
} | |
opt = 1; | |
if( setsockopt( s, SOL_TCP, TCP_KEEPINTVL, &opt, sizeof(opt) ) < 0 ) { | |
perror( "setsockopt( TCP_KEEPINTVL )" ); | |
return EXIT_FAILURE; | |
} | |
opt = 10; | |
if( setsockopt( s, SOL_TCP, TCP_KEEPCNT, &opt, sizeof(opt) ) < 0 ) { | |
perror( "setsockopt( TCP_KEEPCNT )" ); | |
return EXIT_FAILURE; | |
} | |
struct sockaddr_in addr; | |
memset( &addr, 0, sizeof(addr) ); | |
addr.sin_family = AF_INET; | |
addr.sin_addr.s_addr = INADDR_ANY; | |
addr.sin_port = htons(8080); | |
if( bind( s, (struct sockaddr *)&addr, sizeof(addr) ) < 0 ) { | |
perror( "bind" ); | |
return EXIT_FAILURE; | |
} | |
if( listen( s, 1 ) < 0 ) { | |
perror( "listen" ); | |
return EXIT_FAILURE; | |
} | |
int c = accept( s, NULL, NULL ); | |
if( c < 0 ) { | |
perror( "accept" ); | |
return EXIT_FAILURE; | |
} | |
FILE *f = fdopen( c, "r" ); | |
if( f == NULL ) { | |
perror( "fdopen" ); | |
return EXIT_FAILURE; | |
} | |
char *line = NULL; | |
size_t line_sz = 0; | |
while( getline( &line, &line_sz, f ) != -1 ) | |
fputs( line, stdout ); | |
free( line ); | |
if( close(c) < 0 ) { | |
perror( "close" ); | |
return EXIT_FAILURE; | |
} | |
if( close(s) < 0 ) { | |
perror( "close" ); | |
return EXIT_FAILURE; | |
} | |
return EXIT_SUCCESS; | |
} |
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