07-29-2008
Socket Handling Differences Between Linux & Unix?
Sorry if this is a stupid question!
I have been developing a Java application that I am deploying on both Unix and Linux servers, which uses lots of socket handling. When the server side connection is dropped by the server un-gracefully I have been seeing close_waits and null connections.
I am working through socket handling and fixing problems as I go, but my question is:
Do I need to re-test everything on both Linux and Unix, or is the socket handling identical between the 2? i.e. if I complete all testing on Linux, can I release the applicaion on Unix with 100% confidence that there are no underlying socket handling differences that could cause close_wait or null connection problems later?
Unix = HP-UX 11i
Linux = RH4
Thanks.
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LEARN ABOUT MOJAVE
curlopt_unix_socket_path
CURLOPT_UNIX_SOCKET_PATH(3) curl_easy_setopt options CURLOPT_UNIX_SOCKET_PATH(3)
NAME
CURLOPT_UNIX_SOCKET_PATH - set Unix domain socket
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_UNIX_SOCKET_PATH, char *path);
DESCRIPTION
Enables the use of Unix domain sockets as connection endpoint and sets the path to path. If path is NULL, then Unix domain sockets are dis-
abled. An empty string will result in an error at some point, it will not disable use of Unix domain sockets.
When enabled, curl will connect to the Unix domain socket instead of establishing a TCP connection to a host. Since no TCP connection is
created, curl does not need to resolve the DNS hostname in the URL.
The maximum path length on Cygwin, Linux and Solaris is 107. On other platforms it might be even less.
Proxy and TCP options such as CURLOPT_TCP_NODELAY(3) are not supported. Proxy options such as CURLOPT_PROXY(3) have no effect either as
these are TCP-oriented, and asking a proxy server to connect to a certain Unix domain socket is not possible.
The application does not have to keep the string around after setting this option.
DEFAULT
Default is NULL, meaning that no Unix domain sockets are used.
PROTOCOLS
All protocols except for file:// and FTP are supported in theory. HTTP, IMAP, POP3 and SMTP should in particular work (including their
SSL/TLS variants).
EXAMPLE
Given that you have an nginx server running, listening on /tmp/nginx.sock, you can request a HTTP resource with:
curl_easy_setopt(curl_handle, CURLOPT_UNIX_SOCKET_PATH, "/tmp/nginx.sock");
curl_easy_setopt(curl_handle, CURLOPT_URL, "http://localhost/");
If you are on Linux and somehow have a need for paths larger than 107 bytes, you could use the proc filesystem to bypass the limitation:
int dirfd = open(long_directory_path_to_socket, O_DIRECTORY | O_RDONLY);
char path[108];
snprintf(path, sizeof(path), "/proc/self/fd/%d/nginx.sock", dirfd);
curl_easy_setopt(curl_handle, CURLOPT_UNIX_SOCKET_PATH, path);
/* Be sure to keep dirfd valid until you discard the handle */
AVAILABILITY
Since 7.40.0.
RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
SEE ALSO
CURLOPT_OPENSOCKETFUNCTION(3), unix(7),
libcurl 7.54.0 December 21, 2016 CURLOPT_UNIX_SOCKET_PATH(3)