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Minor C cleanup (#27)

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* Minor C cleanup

 - some symbols can be made static:
    1. set_gov_state
    2. everything in gamemode_client.h
 - daemonize() can also take a const char*, since the name is only
   passed to printf() or syslog()
 - prevent shadowing of variables
 - use explicit (void) as parameter-list more consistently
 - use some more const.
   Move cast to more appropriate place and document that execv() behaves
   as if args where of type const *char and we trust on that.
 - example: Just use main(void), which is also an acceptable ISO-C decl
 - example: Use stderr for errors

* Fix -Wold-style-declaration issue
This commit is contained in:
Leonard 2018-04-16 18:21:35 +02:00 committed by Marc Di Luzio
parent 6b71edf740
commit 752d877196
8 changed files with 34 additions and 27 deletions
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2
daemon/cpugovctl.c
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@ -40,7 +40,7 @@ POSSIBILITY OF SUCH DAMAGE.
/**
* Sets all governors to a value
*/
void set_gov_state(const char *value)
static void set_gov_state(const char *value)
{
char governors[MAX_GOVERNORS][MAX_GOVERNOR_LENGTH] = { { 0 } };
int num = fetch_governors(governors);

2
daemon/daemonize.c
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@ -39,7 +39,7 @@ POSSIBILITY OF SUCH DAMAGE.
/**
* Helper to perform standard UNIX daemonization
*/
void daemonize(char *name)
void daemonize(const char *name)
{
/* Initial fork */
pid_t pid = fork();

2
daemon/daemonize.h
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@ -35,4 +35,4 @@ POSSIBILITY OF SUCH DAMAGE.
* Attempt daemonization of the process.
* If this fails, the process will exit
*/
void daemonize(char *name);
void daemonize(const char *name);

4
daemon/governors-query.c
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@ -77,7 +77,7 @@ int fetch_governors(char governors[MAX_GOVERNORS][MAX_GOVERNOR_LENGTH])
}
/* Only add this governor if it is unique */
for (int i = 0; i < num_governors; i++) {
for (int j = 0; j < num_governors; j++) {
if (strncmp(fullpath, governors[i], MAX_GOVERNOR_LENGTH) == 0) {
continue;
}
@ -95,7 +95,7 @@ int fetch_governors(char governors[MAX_GOVERNORS][MAX_GOVERNOR_LENGTH])
/**
* Return the current governor state
*/
const char *get_gov_state()
const char *get_gov_state(void)
{
/* Cached primary governor state */
static char governor[64] = { 0 };

18
daemon/governors.c
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@ -46,7 +46,7 @@ static const char *initial = NULL;
/**
* Cache the governor state as seen at startup
*/
void update_initial_gov_state()
void update_initial_gov_state(void)
{
initial = get_gov_state();
}
@ -61,9 +61,9 @@ bool set_governors(const char *value)
int ret = 0;
int r = -1;
const char *govern = value ? value : initial;
char *exec_args[] = {
"/usr/bin/pkexec", LIBEXECDIR "/cpugovctl", "set", (char *)govern, NULL,
const char *const govern = value ? value : initial;
const char *const exec_args[] = {
"/usr/bin/pkexec", LIBEXECDIR "/cpugovctl", "set", govern, NULL,
};
LOG_MSG("Requesting update of governor policy to %s\n", govern);
@ -73,7 +73,13 @@ bool set_governors(const char *value)
return false;
} else if (p == 0) {
/* Execute the command */
if ((r = execv(exec_args[0], exec_args)) != 0) {
/* Note about cast:
* The statement about argv[] and envp[] being constants is
* included to make explicit to future writers of language
* bindings that these objects are completely constant.
* http://pubs.opengroup.org/onlinepubs/9699919799/functions/exec.html
*/
if ((r = execv(exec_args[0], (char *const *)exec_args)) != 0) {
LOG_ERROR("Failed to execute cpugovctl helper: %s %s\n", exec_args[1], strerror(errno));
exit(EXIT_FAILURE);
}
@ -100,7 +106,7 @@ bool set_governors(const char *value)
/**
* Return the cached governor seen at startup
*/
const char *get_initial_governor()
const char *get_initial_governor(void)
{
return initial;
}

2
daemon/logging.c
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@ -47,7 +47,7 @@ void set_use_syslog(const char *name)
/**
* Simple getter for the syslog var
*/
bool get_use_syslog()
bool get_use_syslog(void)
{
return use_syslog;
}

6
example/main.c
View File

@ -34,11 +34,11 @@ POSSIBILITY OF SUCH DAMAGE.
#include <stdio.h>
#include <unistd.h>
int main(__attribute__((unused)) int argc, __attribute__((unused)) char **argv)
int main(void)
{
/* Request we start game mode */
if (gamemode_request_start() != 0) {
printf("Failed to request gamemode start: %s...\n", gamemode_error_string());
fprintf(stderr, "Failed to request gamemode start: %s...\n", gamemode_error_string());
}
/* Simulate running a game */
@ -46,6 +46,6 @@ int main(__attribute__((unused)) int argc, __attribute__((unused)) char **argv)
/* Request we end game mode (optional) */
if (gamemode_request_end() != 0) {
printf("Failed to request gamemode end: %s...\n", gamemode_error_string());
fprintf(stderr, "Failed to request gamemode end: %s...\n", gamemode_error_string());
}
}

25
lib/gamemode_client.h
View File

@ -38,7 +38,7 @@ POSSIBILITY OF SUCH DAMAGE.
#include <errno.h>
#include <string.h>
char _client_error_string[512] = { 0 };
static char _client_error_string[512] = { 0 };
/**
* Load libgamemode dynamically to dislodge us from most dependencies.
@ -46,7 +46,7 @@ char _client_error_string[512] = { 0 };
* See SDL2 for an example of the reasoning behind this in terms of
* dynamic versioning as well.
*/
volatile int _libgamemode_loaded = 1;
static volatile int _libgamemode_loaded = 1;
/* Typedefs for the functions to load */
typedef int (*_gamemode_request_start)(void);
@ -54,18 +54,19 @@ typedef int (*_gamemode_request_end)(void);
typedef const char *(*_gamemode_error_string)(void);
/* Storage for functors */
_gamemode_request_start _REAL_gamemode_request_start = NULL;
_gamemode_request_end _REAL_gamemode_request_end = NULL;
_gamemode_error_string _REAL_gamemode_error_string = NULL;
static _gamemode_request_start _REAL_gamemode_request_start = NULL;
static _gamemode_request_end _REAL_gamemode_request_end = NULL;
static _gamemode_error_string _REAL_gamemode_error_string = NULL;
/**
* Internal helper to perform the symbol binding safely.
*
* Returns 0 on success and -1 on failure
*/
__attribute__((always_inline)) inline int _bind_libgamemode_symbol(void *handle, const char *name,
void **out_func,
size_t func_size)
__attribute__((always_inline)) static inline int _bind_libgamemode_symbol(void *handle,
const char *name,
void **out_func,
size_t func_size)
{
void *symbol_lookup = NULL;
char *dl_error = NULL;
@ -88,7 +89,7 @@ __attribute__((always_inline)) inline int _bind_libgamemode_symbol(void *handle,
*
* Returns 0 on success and -1 on failure
*/
__attribute__((always_inline)) inline int _load_libgamemode(void)
__attribute__((always_inline)) static inline int _load_libgamemode(void)
{
/* We start at 1, 0 is a success and -1 is a fail */
if (_libgamemode_loaded != 1) {
@ -146,7 +147,7 @@ __attribute__((always_inline)) inline int _load_libgamemode(void)
/**
* Redirect to the real libgamemode
*/
__attribute__((always_inline)) inline const char *gamemode_error_string(void)
__attribute__((always_inline)) static inline const char *gamemode_error_string(void)
{
/* If we fail to load the system gamemode, return our error string */
if (_load_libgamemode() < 0) {
@ -164,7 +165,7 @@ __attribute__((always_inline)) inline const char *gamemode_error_string(void)
#ifdef GAMEMODE_AUTO
__attribute__((constructor))
#else
__attribute__((always_inline)) inline
__attribute__((always_inline)) static inline
#endif
int gamemode_request_start(void)
{
@ -190,7 +191,7 @@ int gamemode_request_start(void)
#ifdef GAMEMODE_AUTO
__attribute__((destructor))
#else
__attribute__((always_inline)) inline
__attribute__((always_inline)) static inline
#endif
int gamemode_request_end(void)
{