examples/c: add support for clang-format

Add support for clang-format so the code style would be consistent
throughout the whole project for C examples.

Signed-off-by: Hosein Bakhtiari <[email protected]>

.clang-format

@@ -0,0 +1,153 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# clang-format configuration file. Intended for clang-format >= 11.
+#
+# For more information, see:
+#
+#   Documentation/process/clang-format.rst
+#   https://clang.llvm.org/docs/ClangFormat.html
+#   https://clang.llvm.org/docs/ClangFormatStyleOptions.html
+#
+---
+AccessModifierOffset: -4
+AlignAfterOpenBracket: Align
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: false
+AlignEscapedNewlines: Left
+AlignOperands: true
+AlignTrailingComments: false
+AllowAllParametersOfDeclarationOnNextLine: false
+AllowShortBlocksOnASingleLine: false
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: None
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: false
+BinPackArguments: true
+BinPackParameters: true
+BraceWrapping:
+  AfterClass: false
+  AfterControlStatement: false
+  AfterEnum: false
+  AfterFunction: true
+  AfterNamespace: true
+  AfterObjCDeclaration: false
+  AfterStruct: false
+  AfterUnion: false
+  AfterExternBlock: false
+  BeforeCatch: false
+  BeforeElse: false
+  IndentBraces: false
+  SplitEmptyFunction: true
+  SplitEmptyRecord: true
+  SplitEmptyNamespace: true
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Custom
+BreakBeforeInheritanceComma: false
+BreakBeforeTernaryOperators: false
+BreakConstructorInitializersBeforeComma: false
+BreakConstructorInitializers: BeforeComma
+BreakAfterJavaFieldAnnotations: false
+BreakStringLiterals: false
+ColumnLimit: 100
+CommentPragmas: '^ IWYU pragma:'
+CompactNamespaces: false
+ConstructorInitializerAllOnOneLineOrOnePerLine: false
+ConstructorInitializerIndentWidth: 8
+ContinuationIndentWidth: 8
+Cpp11BracedListStyle: false
+DerivePointerAlignment: false
+DisableFormat: false
+ExperimentalAutoDetectBinPacking: false
+FixNamespaceComments: false
+
+ForEachMacros:
+  - 'bpf__perf_for_each_map'
+  - 'bpf__perf_for_each_map_named'
+  - 'bpf_for_each_spilled_reg'
+  - 'bpf_object__for_each_map'
+  - 'bpf_object__for_each_program'
+  - 'bpf_object__for_each_safe'
+  - 'bpf_perf_object__for_each'
+  - 'for_each_btf_ext_rec'
+  - 'for_each_btf_ext_sec'
+  - 'hashmap__for_each_entry'
+  - 'hashmap__for_each_entry_safe'
+  - 'hashmap__for_each_key_entry'
+  - 'hashmap__for_each_key_entry_safe'
+  - 'list_for_each_entry'
+  - 'libbpf_nla_for_each_attr'
+  - 'list_for_each_entry'
+  - 'list_for_each_entry_continue'
+  - 'list_for_each_entry_continue_rcu'
+  - 'list_for_each_entry_continue_reverse'
+  - 'list_for_each_entry_from'
+  - 'list_for_each_entry_from_rcu'
+  - 'list_for_each_entry_from_reverse'
+  - 'list_for_each_entry_lockless'
+  - 'list_for_each_entry_rcu'
+  - 'list_for_each_entry_reverse'
+  - 'list_for_each_entry_safe'
+  - 'list_for_each_entry_safe_continue'
+  - 'list_for_each_entry_safe_from'
+  - 'list_for_each_entry_safe_reverse'
+  - 'list_for_each_entry_srcu'
+
+
+IncludeBlocks: Preserve
+IncludeCategories:
+  - Regex: '.*'
+    Priority: 1
+IncludeIsMainRegex: '(Test)?$'
+IndentCaseLabels: false
+IndentGotoLabels: false
+IndentPPDirectives: None
+IndentWidth: 8
+IndentWrappedFunctionNames: false
+JavaScriptQuotes: Leave
+JavaScriptWrapImports: true
+KeepEmptyLinesAtTheStartOfBlocks: false
+MacroBlockBegin: ''
+MacroBlockEnd: ''
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+ObjCBinPackProtocolList: Auto
+ObjCBlockIndentWidth: 8
+ObjCSpaceAfterProperty: true
+ObjCSpaceBeforeProtocolList: true
+
+# Taken from git's rules
+PenaltyBreakAssignment: 10
+PenaltyBreakBeforeFirstCallParameter: 30
+PenaltyBreakComment: 10
+PenaltyBreakFirstLessLess: 0
+PenaltyBreakString: 10
+PenaltyExcessCharacter: 100
+PenaltyReturnTypeOnItsOwnLine: 60
+
+PointerAlignment: Right
+ReflowComments: false
+SortIncludes: false
+SortUsingDeclarations: false
+SpaceAfterCStyleCast: false
+SpaceAfterTemplateKeyword: true
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeCtorInitializerColon: true
+SpaceBeforeInheritanceColon: true
+SpaceBeforeParens: ControlStatementsExceptForEachMacros
+SpaceBeforeRangeBasedForLoopColon: true
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 1
+SpacesInAngles: false
+SpacesInContainerLiterals: false
+SpacesInCStyleCastParentheses: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+Standard: Cpp03
+TabWidth: 8
+UseTab: Always
+
+AlignConsecutiveMacros: AcrossEmptyLines

.gitignore

@@ -1,3 +1,4 @@
 /build
 /examples/c/build
 /examples/c/.xmake
+/.idea

examples/c/.gitignore

@@ -10,3 +10,5 @@
 /sockfilter
 /tc
 /ksyscall
+/cmake-build-debug/
+/cmake-build-release/

examples/c/bootstrap.bpf.c

@@ -62,13 +62,13 @@ int handle_exec(struct trace_event_raw_sched_process_exec *ctx)
 }
 
 SEC("tp/sched/sched_process_exit")
-int handle_exit(struct trace_event_raw_sched_process_template* ctx)
+int handle_exit(struct trace_event_raw_sched_process_template *ctx)
 {
 	struct task_struct *task;
 	struct event *e;
 	pid_t pid, tid;
 	u64 id, ts, *start_ts, duration_ns = 0;
-	
+
 	/* get PID and TID of exiting thread/process */
 	id = bpf_get_current_pid_tgid();
 	pid = id >> 32;
@@ -109,4 +109,3 @@ int handle_exit(struct trace_event_raw_sched_process_template* ctx)
 	bpf_ringbuf_submit(e, 0);
 	return 0;
 }
-

examples/c/bootstrap.c

@@ -16,13 +16,12 @@ static struct env {
 
 const char *argp_program_version = "bootstrap 0.0";
 const char *argp_program_bug_address = "<[email protected]>";
-const char argp_program_doc[] =
-"BPF bootstrap demo application.\n"
-"\n"
-"It traces process start and exits and shows associated \n"
-"information (filename, process duration, PID and PPID, etc).\n"
-"\n"
-"USAGE: ./bootstrap [-d <min-duration-ms>] [-v]\n";
+const char argp_program_doc[] = "BPF bootstrap demo application.\n"
+				"\n"
+				"It traces process start and exits and shows associated \n"
+				"information (filename, process duration, PID and PPID, etc).\n"
+				"\n"
+				"USAGE: ./bootstrap [-d <min-duration-ms>] [-v]\n";
 
 static const struct argp_option opts[] = {
 	{ "verbose", 'v', NULL, 0, "Verbose debug output" },
@@ -85,14 +84,14 @@ static int handle_event(void *ctx, void *data, size_t data_sz)
 	strftime(ts, sizeof(ts), "%H:%M:%S", tm);
 
 	if (e->exit_event) {
-		printf("%-8s %-5s %-16s %-7d %-7d [%u]",
-		       ts, "EXIT", e->comm, e->pid, e->ppid, e->exit_code);
+		printf("%-8s %-5s %-16s %-7d %-7d [%u]", ts, "EXIT", e->comm, e->pid, e->ppid,
+		       e->exit_code);
 		if (e->duration_ns)
 			printf(" (%llums)", e->duration_ns / 1000000);
 		printf("\n");
 	} else {
-		printf("%-8s %-5s %-16s %-7d %-7d %s\n",
-		       ts, "EXEC", e->comm, e->pid, e->ppid, e->filename);
+		printf("%-8s %-5s %-16s %-7d %-7d %s\n", ts, "EXEC", e->comm, e->pid, e->ppid,
+		       e->filename);
 	}
 
 	return 0;
@@ -149,8 +148,8 @@ int main(int argc, char **argv)
 	}
 
 	/* Process events */
-	printf("%-8s %-5s %-16s %-7s %-7s %s\n",
-	       "TIME", "EVENT", "COMM", "PID", "PPID", "FILENAME/EXIT CODE");
+	printf("%-8s %-5s %-16s %-7s %-7s %s\n", "TIME", "EVENT", "COMM", "PID", "PPID",
+	       "FILENAME/EXIT CODE");
 	while (!exiting) {
 		err = ring_buffer__poll(rb, 100 /* timeout, ms */);
 		/* Ctrl-C will cause -EINTR */

examples/c/bootstrap.h

@@ -3,7 +3,7 @@
 #ifndef __BOOTSTRAP_H
 #define __BOOTSTRAP_H
 
-#define TASK_COMM_LEN 16
+#define TASK_COMM_LEN	 16
 #define MAX_FILENAME_LEN 127
 
 struct event {

examples/c/ksyscall.bpf.c

@@ -6,7 +6,7 @@
 #define TASK_COMM_LEN 16
 
 SEC("ksyscall/tgkill")
-int BPF_KSYSCALL(tgkill_entry, pid_t tgid, pid_t tid, int sig) 
+int BPF_KSYSCALL(tgkill_entry, pid_t tgid, pid_t tid, int sig)
 {
 	char comm[TASK_COMM_LEN];
 	__u32 caller_pid = bpf_get_current_pid_tgid() >> 32;
@@ -22,13 +22,14 @@ int BPF_KSYSCALL(tgkill_entry, pid_t tgid, pid_t tid, int sig)
 	}
 
 	bpf_get_current_comm(&comm, sizeof(comm));
-	bpf_printk("tgkill syscall called by PID %d (%s) for thread id %d with pid %d and signal %d.",
-		   caller_pid, comm, tid, tgid, sig);
+	bpf_printk(
+		"tgkill syscall called by PID %d (%s) for thread id %d with pid %d and signal %d.",
+		caller_pid, comm, tid, tgid, sig);
 	return 0;
 }
 
 SEC("ksyscall/kill")
-int BPF_KSYSCALL(entry_probe, pid_t pid, int sig) 
+int BPF_KSYSCALL(entry_probe, pid_t pid, int sig)
 {
 	char comm[TASK_COMM_LEN];
 	__u32 caller_pid = bpf_get_current_pid_tgid() >> 32;
@@ -44,8 +45,8 @@ int BPF_KSYSCALL(entry_probe, pid_t pid, int sig)
 	}
 
 	bpf_get_current_comm(&comm, sizeof(comm));
-	bpf_printk("KILL syscall called by PID %d (%s) for PID %d with signal %d.",
-		   caller_pid, comm, pid, sig);
+	bpf_printk("KILL syscall called by PID %d (%s) for PID %d with signal %d.", caller_pid,
+		   comm, pid, sig);
 	return 0;
 }
 

examples/c/minimal_legacy.c

@@ -29,7 +29,8 @@ int main(int argc, char **argv)
 
 	/* ensure BPF program only handles write() syscalls from our process */
 	pid = getpid();
-	err = bpf_map__update_elem(skel->maps.my_pid_map, &index, sizeof(index), &pid, sizeof(pid_t), BPF_ANY);
+	err = bpf_map__update_elem(skel->maps.my_pid_map, &index, sizeof(index), &pid,
+				   sizeof(pid_t), BPF_ANY);
 	if (err < 0) {
 		fprintf(stderr, "Error updating map with pid: %s\n", strerror(err));
 		goto cleanup;

examples/c/profile.bpf.c

@@ -34,7 +34,8 @@ int profile(void *ctx)
 
 	event->kstack_sz = bpf_get_stack(ctx, event->kstack, sizeof(event->kstack), 0);
 
-	event->ustack_sz = bpf_get_stack(ctx, event->ustack, sizeof(event->ustack), BPF_F_USER_STACK);
+	event->ustack_sz =
+		bpf_get_stack(ctx, event->ustack, sizeof(event->ustack), BPF_F_USER_STACK);
 
 	bpf_ringbuf_submit(event, 0);
 

examples/c/profile.c

@@ -21,8 +21,8 @@
  */
 extern int parse_cpu_mask_file(const char *fcpu, bool **mask, int *mask_sz);
 
-static long perf_event_open(struct perf_event_attr *hw_event, pid_t pid,
-			    int cpu, int group_fd, unsigned long flags)
+static long perf_event_open(struct perf_event_attr *hw_event, pid_t pid, int cpu, int group_fd,
+			    unsigned long flags)
 {
 	int ret;
 
@@ -59,13 +59,11 @@ static void show_stack_trace(__u64 *stack, int stack_sz, pid_t pid)
 		if (result->entries[i].size == 1) {
 			sym = &result->entries[i].syms[0];
 			if (sym->path && sym->path[0]) {
-				printf("  %d [<%016llx>] %s+0x%llx %s:%ld\n",
-				       i, stack[i], sym->symbol,
-				       stack[i] - sym->start_address,
-				       sym->path, sym->line_no);
+				printf("  %d [<%016llx>] %s+0x%llx %s:%ld\n", i, stack[i],
+				       sym->symbol, stack[i] - sym->start_address, sym->path,
+				       sym->line_no);
 			} else {
-				printf("  %d [<%016llx>] %s+0x%llx\n",
-				       i, stack[i], sym->symbol,
+				printf("  %d [<%016llx>] %s+0x%llx\n", i, stack[i], sym->symbol,
 				       stack[i] - sym->start_address);
 			}
 			continue;
@@ -75,9 +73,8 @@ static void show_stack_trace(__u64 *stack, int stack_sz, pid_t pid)
 		for (j = 0; j < result->entries[i].size; j++) {
 			sym = &result->entries[i].syms[j];
 			if (sym->path && sym->path[0]) {
-				printf("        %s+0x%llx %s:%ld\n",
-				       sym->symbol, stack[i] - sym->start_address,
-				       sym->path, sym->line_no);
+				printf("        %s+0x%llx %s:%ld\n", sym->symbol,
+				       stack[i] - sym->start_address, sym->path, sym->line_no);
 			} else {
 				printf("        %s+0x%llx\n", sym->symbol,
 				       stack[i] - sym->start_address);
@@ -121,7 +118,7 @@ static void show_help(const char *progname)
 	printf("Usage: %s [-f <frequency>] [-h]\n", progname);
 }
 
-int main(int argc, char * const argv[])
+int main(int argc, char *const argv[])
 {
 	const char *online_cpus_file = "/sys/devices/system/cpu/online";
 	int freq = 1, pid = -1, cpu;
@@ -218,7 +215,7 @@ int main(int argc, char * const argv[])
 			goto cleanup;
 		}
 	}
-	
+
 	/* Wait and receive stack traces */
 	while (ring_buffer__poll(ring_buf, -1) >= 0) {
 	}

examples/c/profile.h

@@ -8,7 +8,7 @@
 #endif
 
 #ifndef MAX_STACK_DEPTH
-#define MAX_STACK_DEPTH         128
+#define MAX_STACK_DEPTH 128
 #endif
 
 typedef __u64 stack_trace_t[MAX_STACK_DEPTH];

examples/c/sockfilter.bpf.c

@@ -9,8 +9,8 @@
 #include <bpf/bpf_endian.h>
 #include "sockfilter.h"
 
-#define IP_MF		0x2000
-#define IP_OFFSET	0x1FFF
+#define IP_MF	  0x2000
+#define IP_OFFSET 0x1FFF
 
 char LICENSE[] SEC("license") = "Dual BSD/GPL";