Felipe Gasper created SOLR-10390:
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Summary: lsof has too many kernel dependencies
Key: SOLR-10390
URL: https://issues.apache.org/jira/browse/SOLR-10390
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Felipe Gasper
lsof seems a very "heavy" solution for just checking whether a socket is open.
In Linux in particular it's problematic because there are kernel options that
will break lsof, e.g. CloudLinux's *kernel.user_ptrace* and
*kernel.user_ptrace_self* options.
If all that's needed here is a simple connect() to the socket, what about
shipping something simple like this:
{code}
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
void _fail() {
exit(EXIT_FAILURE);
}
void error(const char *msg) {
perror(msg);
_fail();
}
int main(int argc, char *argv[]) {
int sockfd, portno, n;
struct sockaddr_in serv_addr;
struct hostent *server;
char buffer[256];
if (argc < 3) {
fprintf(stderr,"usage %s hostname port\n", argv[0]);
_fail();
}
portno = atoi(argv[2]);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0) {
error("ERROR opening socket");
}
server = gethostbyname(argv[1]);
if (server == NULL) {
fprintf(stderr,"ERROR: no such host\n");
_fail();
}
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
bcopy((char *)server->h_addr,
(char *)&serv_addr.sin_addr.s_addr,
server->h_length);
serv_addr.sin_port = htons(portno);
if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0) {
error("ERROR connecting");
}
fprintf(stdout, "OK\n");
return 0;
}
{code}
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