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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/samples/bpf/bpf_load.c
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@@ -16,7 +16,6 @@
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 #include <linux/netlink.h>
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 #include <linux/rtnetlink.h>
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 #include <linux/types.h>
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-#include <sys/types.h>
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 #include <sys/socket.h>
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 #include <sys/syscall.h>
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 #include <sys/ioctl.h>
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@@ -41,7 +40,7 @@
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 int prog_array_fd = -1;
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 struct bpf_map_data map_data[MAX_MAPS];
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-int map_data_count = 0;
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+int map_data_count;
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 static int populate_prog_array(const char *event, int prog_fd)
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 {
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@@ -66,7 +65,7 @@
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 	else
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 		flags = O_WRONLY | O_APPEND;
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-	fd = open("/sys/kernel/debug/tracing/kprobe_events", flags);
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+	fd = open(DEBUGFS "kprobe_events", flags);
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 	ret = write(fd, val, strlen(val));
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 	close(fd);
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@@ -302,8 +301,8 @@
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 							numa_node);
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 		}
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 		if (map_fd[i] < 0) {
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-			printf("failed to create a map: %d %s\n",
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-			       errno, strerror(errno));
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+			printf("failed to create map %d (%s): %d %s\n",
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+			       i, maps[i].name, errno, strerror(errno));
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 			return 1;
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 		}
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 		maps[i].fd = map_fd[i];
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@@ -491,8 +490,8 @@
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 		/* Verify no newer features were requested */
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 		if (validate_zero) {
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-			addr = (unsigned char*) def + map_sz_copy;
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-			end  = (unsigned char*) def + map_sz_elf;
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+			addr = (unsigned char *) def + map_sz_copy;
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+			end  = (unsigned char *) def + map_sz_elf;
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 			for (; addr < end; addr++) {
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 				if (*addr != 0) {
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 					free(sym);
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@@ -665,24 +664,4 @@
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 int load_bpf_file_fixup_map(const char *path, fixup_map_cb fixup_map)
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 {
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 	return do_load_bpf_file(path, fixup_map);
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-}
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-
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-void read_trace_pipe(void)
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-{
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-	int trace_fd;
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-
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-	trace_fd = open(DEBUGFS "trace_pipe", O_RDONLY, 0);
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-	if (trace_fd < 0)
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-		return;
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-
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-	while (1) {
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-		static char buf[4096];
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-		ssize_t sz;
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-
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-		sz = read(trace_fd, buf, sizeof(buf) - 1);
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-		if (sz > 0) {
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-			buf[sz] = 0;
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-			puts(buf);
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-		}
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-	}
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 }