feat: c client (#6)

client.cu

@@ -0,0 +1,104 @@
+#define _GNU_SOURCE
+
+#include <arpa/inet.h>
+#include <stdio.h>
+#include <dlfcn.h>
+#include <string.h>
+#include <nvml.h>
+#include <unistd.h>
+#include <pthread.h>
+
+int sockfd;
+
+int open_rpc_client()
+{
+    int connfd;
+    struct sockaddr_in servaddr, cli;
+
+    if (sockfd != 0)
+    {
+        return sockfd;
+    }
+
+    sockfd = socket(AF_INET, SOCK_STREAM, 0);
+    if (sockfd == -1)
+    {
+        printf("socket creation failed...\n");
+        exit(0);
+    }
+
+    bzero(&servaddr, sizeof(servaddr));
+
+    // assign IP, PORT
+    servaddr.sin_family = AF_INET;
+    servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");
+    servaddr.sin_port = htons(14833);
+    if (connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) != 0)
+    {
+        printf("connection with the server failed...\n");
+        exit(0);
+    }
+    return sockfd;
+}
+
+int nextRequestId = 0, responseId = -1;
+
+int send_rpc_message(const char *op, const void *args, const int argslen)
+{
+    char oplen = (char)strlen(op);
+    if (write(sockfd, (void *)&nextRequestId, sizeof(int)) < 0)
+        return -1;
+    if (write(sockfd, (void *)&oplen, sizeof(char)) < 0)
+        return -1;
+    if (write(sockfd, op, oplen) < 0)
+        return -1;
+    if (write(sockfd, (void *)&argslen, sizeof(int)) < 0)
+        return -1;
+    if (write(sockfd, args, argslen) < 0)
+        return -1;
+}
+
+void close_rpc_client()
+{
+    close(sockfd);
+    sockfd = 0;
+}
+
+nvmlReturn_t nvmlInitWithFlags(unsigned int flags)
+{
+    open_rpc_client();
+    char buffer[1024];
+    sprintf(buffer, "nvmlInitWithFlags %d\n", flags);
+    write(sockfd, buffer, strlen(buffer));
+    return NVML_SUCCESS;
+}
+
+nvmlReturn_t nvmlDeviceGetName(nvmlDevice_t device, char *name, unsigned int length)
+{
+    // write "HI MUGIT" to the name buffer
+    strcpy(name, "HI MUGIT");
+    return NVML_SUCCESS;
+}
+
+nvmlReturn_t nvmlDeviceGetName(nvmlDevice_t device, char *name, unsigned int length)
+{
+    // write "HI MUGIT" to the name buffer
+    strcpy(name, "HI MUGIT");
+    return NVML_SUCCESS;
+}
+
+void *dlsym(void *handle, const char *name)
+{
+    printf("Resolving symbol: %s\n", name);
+
+    if (!strcmp(name, "nvmlDeviceGetName"))
+        return (void *)nvmlDeviceGetName;
+
+    static void *(*real_dlsym)(void *, const char *) = NULL;
+    if (real_dlsym == NULL)
+        real_dlsym = (void *(*)(void *, const char *))dlvsym(RTLD_NEXT, "dlsym", "GLIBC_2.2.5");
+    /* my target binary is even asking for dlsym() via dlsym()... */
+    if (!strcmp(name, "dlsym"))
+        return (void *)dlsym;
+    return real_dlsym(handle, name);
+}