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Go Back   Linux Archive > ArchLinux > ArchLinux Pacman Development

 
 
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Old 06-16-2008, 03:49 AM
Dan McGee
 
Default Use access() instead of stat() when possible

We were using the stat() system call in quite a few places when we didn't
actually need anything the stat struct returned- we were simply checking for
file existence. access() will be more efficient in those cases.

Signed-off-by: Dan McGee <dan@archlinux.org>
---
lib/libalpm/be_files.c | 5 ++---
lib/libalpm/trans.c | 8 ++++----
lib/libalpm/util.c | 12 ++++--------
src/pacman/package.c | 5 ++---
src/pacman/util.c | 6 ++----
src/util/testdb.c | 8 +++-----
6 files changed, 17 insertions(+), 27 deletions(-)

diff --git a/lib/libalpm/be_files.c b/lib/libalpm/be_files.c
index 12c60b2..f5d4e82 100644
--- a/lib/libalpm/be_files.c
+++ b/lib/libalpm/be_files.c
@@ -355,7 +355,6 @@ static char *get_pkgpath(pmdb_t *db, pmpkg_t *info)
int _alpm_db_read(pmdb_t *db, pmpkg_t *info, pmdbinfrq_t inforeq)
{
FILE *fp = NULL;
- struct stat buf;
char path[PATH_MAX];
char line[513];
char *pkgpath = NULL;
@@ -393,7 +392,7 @@ int _alpm_db_read(pmdb_t *db, pmpkg_t *info, pmdbinfrq_t inforeq)

pkgpath = get_pkgpath(db, info);

- if(stat(pkgpath, &buf)) {
+ if(access(pkgpath, F_OK)) {
/* directory doesn't exist or can't be opened */
_alpm_log(PM_LOG_DEBUG, "cannot find '%s-%s' in db '%s'
",
info->name, info->version, db->treename);
@@ -631,7 +630,7 @@ int _alpm_db_read(pmdb_t *db, pmpkg_t *info, pmdbinfrq_t inforeq)
/* INSTALL */
if(inforeq & INFRQ_SCRIPTLET) {
snprintf(path, PATH_MAX, "%sinstall", pkgpath);
- if(!stat(path, &buf)) {
+ if(access(path, F_OK) == 0) {
info->scriptlet = 1;
}
}
diff --git a/lib/libalpm/trans.c b/lib/libalpm/trans.c
index eb53e95..06084ae 100644
--- a/lib/libalpm/trans.c
+++ b/lib/libalpm/trans.c
@@ -25,6 +25,7 @@
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
+#include <unistd.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/stat.h>
@@ -451,7 +452,6 @@ int _alpm_runscriptlet(const char *root, const char *installfn,
char tmpdir[PATH_MAX];
char cwd[PATH_MAX];
char *scriptpath;
- struct stat buf;
pid_t pid;
int clean_tmpdir = 0;
int restore_cwd = 0;
@@ -459,14 +459,14 @@ int _alpm_runscriptlet(const char *root, const char *installfn,

ALPM_LOG_FUNC;

- if(stat(installfn, &buf)) {
+ if(access(installfn, R_OK)) {
/* not found */
_alpm_log(PM_LOG_DEBUG, "scriptlet '%s' not found
", installfn);
return(0);
}

/* NOTE: popen will use the PARENT's /bin/sh, not the chroot's */
- if(stat("/bin/sh", &buf)) {
+ if(access("/bin/sh", X_OK)) {
/* not found */
_alpm_log(PM_LOG_ERROR, _("No /bin/sh in parent environment, aborting scriptlet
"));
return(0);
@@ -474,7 +474,7 @@ int _alpm_runscriptlet(const char *root, const char *installfn,

/* creates a directory in $root/tmp/ for copying/extracting the scriptlet */
snprintf(tmpdir, PATH_MAX, "%stmp/", root);
- if(stat(tmpdir, &buf)) {
+ if(access(tmpdir, F_OK) != 0) {
_alpm_makepath_mode(tmpdir, 01777);
}
snprintf(tmpdir, PATH_MAX, "%stmp/alpm_XXXXXX", root);
diff --git a/lib/libalpm/util.c b/lib/libalpm/util.c
index 55bd46a..9199545 100644
--- a/lib/libalpm/util.c
+++ b/lib/libalpm/util.c
@@ -200,12 +200,11 @@ int _alpm_makepath_mode(const char *path, mode_t mode)
str = orig;
while((ptr = strsep(&str, "/"))) {
if(strlen(ptr)) {
- struct stat buf;
/* we have another path component- append the newest component to
* existing string and create one more level of dir structure */
strcat(incr, "/");
strcat(incr, ptr);
- if(stat(incr, &buf)) {
+ if(access(incr, F_OK)) {
if(mkdir(incr, mode)) {
ret = 1;
break;
@@ -533,12 +532,11 @@ int _alpm_logaction(unsigned short usesyslog, FILE *f, const char *fmt, va_list
int _alpm_ldconfig(const char *root)
{
char line[PATH_MAX];
- struct stat buf;

snprintf(line, PATH_MAX, "%setc/ld.so.conf", root);
- if(stat(line, &buf) == 0) {
+ if(access(line, F_OK) == 0) {
snprintf(line, PATH_MAX, "%ssbin/ldconfig", root);
- if(stat(line, &buf) == 0) {
+ if(access(line, X_OK) == 0) {
char cmd[PATH_MAX];
snprintf(cmd, PATH_MAX, "%s -r %s", line, root);
system(cmd);
@@ -561,7 +559,6 @@ int _alpm_str_cmp(const void *s1, const void *s2)
*/
char *_alpm_filecache_find(const char* filename)
{
- struct stat buf;
char path[PATH_MAX];
char *retpath;
alpm_list_t *i;
@@ -570,8 +567,7 @@ char *_alpm_filecache_find(const char* filename)
for(i = alpm_option_get_cachedirs(); i; i = alpm_list_next(i)) {
snprintf(path, PATH_MAX, "%s%s", (char*)alpm_list_getdata(i),
filename);
- if(stat(path, &buf) == 0) {
- /* TODO maybe check to make sure it is readable? */
+ if(access(path, R_OK) == 0) {
retpath = strdup(path);
_alpm_log(PM_LOG_DEBUG, "found cached pkg: %s
", retpath);
return(retpath);
diff --git a/src/pacman/package.c b/src/pacman/package.c
index 1698806..0680037 100644
--- a/src/pacman/package.c
+++ b/src/pacman/package.c
@@ -22,8 +22,8 @@
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
+#include <unistd.h>
#include <limits.h>
-#include <sys/stat.h>
#include <wchar.h>

#include <alpm.h>
@@ -176,7 +176,6 @@ void dump_pkg_backups(pmpkg_t *pkg)
if(alpm_pkg_get_backup(pkg)) {
/* package has backup files, so print them */
for(i = alpm_pkg_get_backup(pkg); i; i = alpm_list_next(i)) {
- struct stat buf;
char path[PATH_MAX];
char *str = strdup(alpm_list_getdata(i));
char *ptr = index(str, ' ');
@@ -188,7 +187,7 @@ void dump_pkg_backups(pmpkg_t *pkg)
ptr++;
snprintf(path, PATH_MAX-1, "%s%s", root, str);
/* if we find the file, calculate checksums, otherwise it is missing */
- if(!stat(path, &buf)) {
+ if(access(path, R_OK) == 0) {
char *md5sum = alpm_get_md5sum(path);

if(md5sum == NULL) {
diff --git a/src/pacman/util.c b/src/pacman/util.c
index e702886..d7ac9e3 100644
--- a/src/pacman/util.c
+++ b/src/pacman/util.c
@@ -22,7 +22,6 @@
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/time.h>
-#include <sys/stat.h>

#include <stdio.h>
#include <stdlib.h>
@@ -125,7 +124,7 @@ int makepath(const char *path)
* orig - a copy of path so we can safely butcher it with strsep
* str - the current position in the path string (after the delimiter)
* ptr - the original position of str after calling strsep
- * incr - incrementally generated path for use in stat/mkdir call
+ * incr - incrementally generated path for use in access/mkdir call
*/
char *orig, *str, *ptr, *incr;
mode_t oldmask = umask(0000);
@@ -136,12 +135,11 @@ int makepath(const char *path)
str = orig;
while((ptr = strsep(&str, "/"))) {
if(strlen(ptr)) {
- struct stat buf;
/* we have another path component- append the newest component to
* existing string and create one more level of dir structure */
strcat(incr, "/");
strcat(incr, ptr);
- if(stat(incr, &buf)) {
+ if(access(incr, F_OK)) {
if(mkdir(incr, 0755)) {
ret = 1;
break;
diff --git a/src/util/testdb.c b/src/util/testdb.c
index f354eca..87bfcf9 100644
--- a/src/util/testdb.c
+++ b/src/util/testdb.c
@@ -23,7 +23,6 @@
#include <errno.h>
#include <limits.h>
#include <string.h>
-#include <sys/stat.h>
#include <dirent.h>
#include <libgen.h>

@@ -61,7 +60,6 @@ static int db_test(char *dbpath)
{
struct dirent *ent;
char path[PATH_MAX];
- struct stat buf;
int ret = 0;

DIR *dir;
@@ -77,17 +75,17 @@ static int db_test(char *dbpath)
}
/* check for desc, depends, and files */
snprintf(path, PATH_MAX, "%s/%s/desc", dbpath, ent->d_name);
- if(stat(path, &buf)) {
+ if(access(path, F_OK)) {
printf("%s: description file is missing
", ent->d_name);
ret++;
}
snprintf(path, PATH_MAX, "%s/%s/depends", dbpath, ent->d_name);
- if(stat(path, &buf)) {
+ if(access(path, F_OK)) {
printf("%s: dependency file is missing
", ent->d_name);
ret++;
}
snprintf(path, PATH_MAX, "%s/%s/files", dbpath, ent->d_name);
- if(stat(path, &buf)) {
+ if(access(path, F_OK)) {
printf("%s: file list is missing
", ent->d_name);
ret++;
}
--
1.5.5.3


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