gri3-wm/libi3/get_process_filename.c

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/*
* vim:ts=4:sw=4:expandtab
*
* i3 - an improved dynamic tiling window manager
* © 2009 Michael Stapelberg and contributors (see also: LICENSE)
*
*/
#include <assert.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <err.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <pwd.h>
#include <unistd.h>
#include <err.h>
#include "libi3.h"
/*
* Returns the name of a temporary file with the specified prefix.
*
*/
char *get_process_filename(const char *prefix) {
/* dir stores the directory path for this and all subsequent calls so that
* we only create a temporary directory once per i3 instance. */
static char *dir = NULL;
if (dir == NULL) {
/* Check if XDG_RUNTIME_DIR is set. If so, we use XDG_RUNTIME_DIR/i3 */
if ((dir = getenv("XDG_RUNTIME_DIR"))) {
char *tmp;
sasprintf(&tmp, "%s/i3", dir);
dir = tmp;
struct stat buf;
if (stat(dir, &buf) != 0) {
if (mkdir(dir, 0700) == -1) {
warn("Could not mkdir(%s)", dir);
errx(EXIT_FAILURE, "Check permissions of $XDG_RUNTIME_DIR = '%s'",
getenv("XDG_RUNTIME_DIR"));
perror("mkdir()");
return NULL;
}
}
} else {
/* If not, we create a (secure) temp directory using the template
* /tmp/i3-<user>.XXXXXX */
struct passwd *pw = getpwuid(getuid());
const char *username = pw ? pw->pw_name : "unknown";
sasprintf(&dir, "/tmp/i3-%s.XXXXXX", username);
/* mkdtemp modifies dir */
if (mkdtemp(dir) == NULL) {
perror("mkdtemp()");
return NULL;
}
}
}
char *filename;
sasprintf(&filename, "%s/%s.%d", dir, prefix, getpid());
return filename;
}