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https://issues.apache.org/jira/browse/SOLR-10390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15947866#comment-15947866
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Hoss Man commented on SOLR-10390:
---------------------------------
In my experience, "lsof" is more likely to exist on a "barebones" linux system
then "perl" ... it's also easier to explain/document for users why we depend on
"lsof" (a relatively small utility) then to convince people they need to
install perl in order to run Solr.
If we want to remove the dependency on lsof, we might as well implement same
basic logic as your suggested C/perl code in SolrCLI so that we can use it on
windows as well.
> 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 EXIT_SUCCESS;
> }
> {code}
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