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dmenu_path.c (shell is a bottleneck)

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This commit is contained in:
Connor Lane Smith 2010-10-08 23:24:22 +01:00
parent 610a0a8d12
commit bf7b8e37ee
3 changed files with 108 additions and 34 deletions
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15
Makefile
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@ -3,7 +3,7 @@
include config.mk include config.mk
all: options dmenu all: options dmenu dmenu_path
options: options:
@echo dmenu build options: @echo dmenu build options:
@ -11,22 +11,21 @@ options:
@echo "LDFLAGS = ${LDFLAGS}" @echo "LDFLAGS = ${LDFLAGS}"
@echo "CC = ${CC}" @echo "CC = ${CC}"
dmenu.o: dmenu.c config.mk dmenu: dmenu.c config.mk
@echo CC $< dmenu_path: dmenu_path.c
@${CC} -c ${CFLAGS} $<
dmenu: dmenu.o dmenu dmenu_path:
@echo CC -o $@ @echo CC -o $@
@${CC} -o $@ $+ ${LDFLAGS} @${CC} -o $@ $< ${CFLAGS} ${LDFLAGS}
clean: clean:
@echo cleaning @echo cleaning
@rm -f dmenu dmenu.o dmenu-${VERSION}.tar.gz @rm -f dmenu dmenu_path dmenu-${VERSION}.tar.gz
dist: clean dist: clean
@echo creating dist tarball @echo creating dist tarball
@mkdir -p dmenu-${VERSION} @mkdir -p dmenu-${VERSION}
@cp LICENSE Makefile README config.mk dmenu.1 dmenu.c dmenu_path dmenu_run dmenu-${VERSION} @cp LICENSE Makefile README config.mk dmenu.1 dmenu.c dmenu_path.c dmenu_run dmenu-${VERSION}
@tar -cf dmenu-${VERSION}.tar dmenu-${VERSION} @tar -cf dmenu-${VERSION}.tar dmenu-${VERSION}
@gzip dmenu-${VERSION}.tar @gzip dmenu-${VERSION}.tar
@rm -rf dmenu-${VERSION} @rm -rf dmenu-${VERSION}

26
dmenu_path
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@ -1,26 +0,0 @@
#!/bin/sh
CACHE=$HOME/.dmenu_cache
IFS=:
uptodate() {
test -f "$CACHE" &&
for dir in $PATH
do
test ! $dir -nt "$CACHE" || return 1
done
}
if ! uptodate
then
for dir in $PATH
do
cd "$dir" &&
for file in *
do
test -x "$file" && echo "$file"
done
done | sort -u > "$CACHE".$$ &&
mv "$CACHE".$$ "$CACHE"
fi
cat "$CACHE"

101
dmenu_path.c Normal file
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@ -0,0 +1,101 @@
/* See LICENSE file for copyright and license details. */
#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#define CACHE ".dmenu_cache"
static int qstrcmp(const void *a, const void *b);
static void die(const char *s);
static void scan(void);
static int uptodate(void);
static char **items = NULL;
static const char *Home, *Path;
static size_t count = 0;
int
main(void) {
if(!(Home = getenv("HOME")))
die("no $HOME");
if(!(Path = getenv("PATH")))
die("no $PATH");
if(chdir(Home) < 0)
die("chdir failed");
if(uptodate()) {
execlp("cat", "cat", CACHE, NULL);
die("exec failed");
}
scan();
return EXIT_SUCCESS;
}
void
die(const char *s) {
fprintf(stderr, "dmenu_path: %s\n", s);
exit(EXIT_FAILURE);
}
int
qstrcmp(const void *a, const void *b) {
return strcmp(*(const char **)a, *(const char **)b);
}
void
scan(void) {
char buf[PATH_MAX];
char *dir, *path;
size_t i;
struct dirent *ent;
DIR *dp;
FILE *cache;
if(!(path = strdup(Path)))
die("strdup failed");
for(dir = strtok(path, ":"); dir; dir = strtok(NULL, ":")) {
if(!(dp = opendir(dir)))
continue;
while((ent = readdir(dp))) {
snprintf(buf, sizeof buf, "%s/%s", dir, ent->d_name);
if(ent->d_name[0] == '.' || access(buf, X_OK) < 0)
continue;
if(!(items = realloc(items, ++count * sizeof *items)))
die("malloc failed");
if(!(items[count-1] = strdup(ent->d_name)))
die("strdup failed");
}
closedir(dp);
}
qsort(items, count, sizeof *items, qstrcmp);
if(!(cache = fopen(CACHE, "w")))
die("open failed");
for(i = 0; i < count; i++) {
if(i > 0 && !strcmp(items[i], items[i-1]))
continue;
fprintf(cache, "%s\n", items[i]);
fprintf(stdout, "%s\n", items[i]);
}
fclose(cache);
free(path);
}
int
uptodate(void) {
char *dir, *path;
time_t mtime;
struct stat st;
if(stat(CACHE, &st) < 0)
return 0;
mtime = st.st_mtime;
if(!(path = strdup(Path)))
die("strdup failed");
for(dir = strtok(path, ":"); dir; dir = strtok(NULL, ":"))
if(!stat(dir, &st) && st.st_mtime > mtime)
return 0;
free(path);
return 1;
}