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From 46b4d26c54a773f7da350e89562039ccc5157a8f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Sun, 19 May 2019 18:02:38 +0200
Subject: [PATCH] shared/cpu-set-util: move the part to print cpu-set into a
separate function
Also avoid unnecessary asprintf() when we can write to the output area
directly.
(cherry picked from commit a832893f9c4f0a0329768e90f67e2fa24bb0008e)
Related: #1734787
---
src/basic/cpu-set-util.c | 21 +++++++++++++++++++++
src/basic/cpu-set-util.h | 1 +
src/core/dbus-execute.c | 29 +++++------------------------
src/test/test-cpu-set-util.c | 29 +++++++++++++++++++++++++++++
4 files changed, 56 insertions(+), 24 deletions(-)
diff --git a/src/basic/cpu-set-util.c b/src/basic/cpu-set-util.c
index b1c927bcb8..8f24a2601a 100644
--- a/src/basic/cpu-set-util.c
+++ b/src/basic/cpu-set-util.c
@@ -5,6 +5,7 @@
#include <errno.h>
#include <stddef.h>
+#include <stdio.h>
#include <syslog.h>
#include "alloc-util.h"
@@ -15,6 +16,26 @@
#include "parse-util.h"
#include "string-util.h"
+char* cpu_set_to_string(const cpu_set_t *set, size_t setsize) {
+ _cleanup_free_ char *str = NULL;
+ size_t allocated = 0, len = 0;
+ int i, r;
+
+ for (i = 0; (size_t) i < setsize * 8; i++) {
+ if (!CPU_ISSET_S(i, setsize, set))
+ continue;
+
+ if (!GREEDY_REALLOC(str, allocated, len + 1 + DECIMAL_STR_MAX(int)))
+ return NULL;
+
+ r = sprintf(str + len, len > 0 ? " %d" : "%d", i);
+ assert_se(r > 0);
+ len += r;
+ }
+
+ return TAKE_PTR(str) ?: strdup("");
+}
+
cpu_set_t* cpu_set_malloc(unsigned *ncpus) {
cpu_set_t *c;
unsigned n = 1024;
diff --git a/src/basic/cpu-set-util.h b/src/basic/cpu-set-util.h
index 88470fe15a..3c546beb55 100644
--- a/src/basic/cpu-set-util.h
+++ b/src/basic/cpu-set-util.h
@@ -26,6 +26,7 @@ static inline cpu_set_t* cpu_set_mfree(cpu_set_t *p) {
cpu_set_t* cpu_set_malloc(unsigned *ncpus);
+char* cpu_set_to_string(const cpu_set_t *set, size_t setsize);
int parse_cpu_set_internal(const char *rvalue, cpu_set_t **cpu_set, bool warn, const char *unit, const char *filename, unsigned line, const char *lvalue);
static inline int parse_cpu_set_and_warn(const char *rvalue, cpu_set_t **cpu_set, const char *unit, const char *filename, unsigned line, const char *lvalue) {
diff --git a/src/core/dbus-execute.c b/src/core/dbus-execute.c
index 5379545d57..d9f4445745 100644
--- a/src/core/dbus-execute.c
+++ b/src/core/dbus-execute.c
@@ -1565,32 +1565,13 @@ int bus_exec_context_set_transient_property(
unit_write_settingf(u, flags, name, "%s=", name);
} else {
_cleanup_free_ char *str = NULL;
- size_t allocated = 0, len = 0, i, ncpus;
+ size_t ncpus;
- ncpus = CPU_SIZE_TO_NUM(n);
-
- for (i = 0; i < ncpus; i++) {
- _cleanup_free_ char *p = NULL;
- size_t add;
-
- if (!CPU_ISSET_S(i, n, (cpu_set_t*) a))
- continue;
-
- r = asprintf(&p, "%zu", i);
- if (r < 0)
- return -ENOMEM;
-
- add = strlen(p);
-
- if (!GREEDY_REALLOC(str, allocated, len + add + 2))
- return -ENOMEM;
-
- strcpy(mempcpy(str + len, p, add), " ");
- len += add + 1;
- }
+ str = cpu_set_to_string(a, n);
+ if (!str)
+ return -ENOMEM;
- if (len != 0)
- str[len - 1] = '\0';
+ ncpus = CPU_SIZE_TO_NUM(n);
if (!c->cpuset || c->cpuset_ncpus < ncpus) {
cpu_set_t *cpuset;
diff --git a/src/test/test-cpu-set-util.c b/src/test/test-cpu-set-util.c
index c9272459b4..ff5edb2a69 100644
--- a/src/test/test-cpu-set-util.c
+++ b/src/test/test-cpu-set-util.c
@@ -6,6 +6,7 @@
static void test_parse_cpu_set(void) {
cpu_set_t *c = NULL;
+ _cleanup_free_ char *str = NULL;
int ncpus;
int cpu;
@@ -15,6 +16,10 @@ static void test_parse_cpu_set(void) {
assert_se(CPU_ISSET_S(1, CPU_ALLOC_SIZE(ncpus), c));
assert_se(CPU_ISSET_S(2, CPU_ALLOC_SIZE(ncpus), c));
assert_se(CPU_COUNT_S(CPU_ALLOC_SIZE(ncpus), c) == 2);
+
+ assert_se(str = cpu_set_to_string(c, CPU_ALLOC_SIZE(ncpus)));
+ log_info("cpu_set_to_string: %s", str);
+ str = mfree(str);
c = cpu_set_mfree(c);
/* A more interesting range */
@@ -25,6 +30,9 @@ static void test_parse_cpu_set(void) {
assert_se(CPU_ISSET_S(cpu, CPU_ALLOC_SIZE(ncpus), c));
for (cpu = 8; cpu < 12; cpu++)
assert_se(CPU_ISSET_S(cpu, CPU_ALLOC_SIZE(ncpus), c));
+ assert_se(str = cpu_set_to_string(c, CPU_ALLOC_SIZE(ncpus)));
+ log_info("cpu_set_to_string: %s", str);
+ str = mfree(str);
c = cpu_set_mfree(c);
/* Quoted strings */
@@ -33,6 +41,9 @@ static void test_parse_cpu_set(void) {
assert_se(CPU_COUNT_S(CPU_ALLOC_SIZE(ncpus), c) == 4);
for (cpu = 8; cpu < 12; cpu++)
assert_se(CPU_ISSET_S(cpu, CPU_ALLOC_SIZE(ncpus), c));
+ assert_se(str = cpu_set_to_string(c, CPU_ALLOC_SIZE(ncpus)));
+ log_info("cpu_set_to_string: %s", str);
+ str = mfree(str);
c = cpu_set_mfree(c);
/* Use commas as separators */
@@ -43,6 +54,9 @@ static void test_parse_cpu_set(void) {
assert_se(CPU_ISSET_S(cpu, CPU_ALLOC_SIZE(ncpus), c));
for (cpu = 8; cpu < 12; cpu++)
assert_se(CPU_ISSET_S(cpu, CPU_ALLOC_SIZE(ncpus), c));
+ assert_se(str = cpu_set_to_string(c, CPU_ALLOC_SIZE(ncpus)));
+ log_info("cpu_set_to_string: %s", str);
+ str = mfree(str);
c = cpu_set_mfree(c);
/* Commas with spaces (and trailing comma, space) */
@@ -51,6 +65,9 @@ static void test_parse_cpu_set(void) {
assert_se(CPU_COUNT_S(CPU_ALLOC_SIZE(ncpus), c) == 8);
for (cpu = 0; cpu < 8; cpu++)
assert_se(CPU_ISSET_S(cpu, CPU_ALLOC_SIZE(ncpus), c));
+ assert_se(str = cpu_set_to_string(c, CPU_ALLOC_SIZE(ncpus)));
+ log_info("cpu_set_to_string: %s", str);
+ str = mfree(str);
c = cpu_set_mfree(c);
/* Ranges */
@@ -61,6 +78,9 @@ static void test_parse_cpu_set(void) {
assert_se(CPU_ISSET_S(cpu, CPU_ALLOC_SIZE(ncpus), c));
for (cpu = 8; cpu < 12; cpu++)
assert_se(CPU_ISSET_S(cpu, CPU_ALLOC_SIZE(ncpus), c));
+ assert_se(str = cpu_set_to_string(c, CPU_ALLOC_SIZE(ncpus)));
+ log_info("cpu_set_to_string: %s", str);
+ str = mfree(str);
c = cpu_set_mfree(c);
/* Ranges with trailing comma, space */
@@ -71,6 +91,9 @@ static void test_parse_cpu_set(void) {
assert_se(CPU_ISSET_S(cpu, CPU_ALLOC_SIZE(ncpus), c));
for (cpu = 8; cpu < 12; cpu++)
assert_se(CPU_ISSET_S(cpu, CPU_ALLOC_SIZE(ncpus), c));
+ assert_se(str = cpu_set_to_string(c, CPU_ALLOC_SIZE(ncpus)));
+ log_info("cpu_set_to_string: %s", str);
+ str = mfree(str);
c = cpu_set_mfree(c);
/* Negative range (returns empty cpu_set) */
@@ -85,6 +108,9 @@ static void test_parse_cpu_set(void) {
assert_se(CPU_COUNT_S(CPU_ALLOC_SIZE(ncpus), c) == 12);
for (cpu = 0; cpu < 12; cpu++)
assert_se(CPU_ISSET_S(cpu, CPU_ALLOC_SIZE(ncpus), c));
+ assert_se(str = cpu_set_to_string(c, CPU_ALLOC_SIZE(ncpus)));
+ log_info("cpu_set_to_string: %s", str);
+ str = mfree(str);
c = cpu_set_mfree(c);
/* Mix ranges and individual CPUs */
@@ -95,6 +121,9 @@ static void test_parse_cpu_set(void) {
assert_se(CPU_ISSET_S(1, CPU_ALLOC_SIZE(ncpus), c));
for (cpu = 4; cpu < 12; cpu++)
assert_se(CPU_ISSET_S(cpu, CPU_ALLOC_SIZE(ncpus), c));
+ assert_se(str = cpu_set_to_string(c, CPU_ALLOC_SIZE(ncpus)));
+ log_info("cpu_set_to_string: %s", str);
+ str = mfree(str);
c = cpu_set_mfree(c);
/* Garbage */
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