77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
#include <unistd.h>
|
||
#include <string.h>
|
||
#include <stdio.h>
|
||
#include <limits.h>
|
||
#include <stdlib.h>
|
||
|
||
#include "libi3.h"
|
||
|
||
/*
|
||
* This function returns the absolute path to the executable it is running in.
|
||
*
|
||
* The implementation follows http://stackoverflow.com/a/933996/712014
|
||
*
|
||
*/
|
||
const char *get_exe_path(const char *argv0) {
|
||
static char destpath[PATH_MAX];
|
||
char tmp[PATH_MAX];
|
||
|
||
#if defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
|
||
/* Linux and Debian/kFreeBSD provide /proc/self/exe */
|
||
#if defined(__linux__) || defined(__FreeBSD_kernel__)
|
||
const char *exepath = "/proc/self/exe";
|
||
#elif defined(__FreeBSD__)
|
||
const char *exepath = "/proc/curproc/file";
|
||
#endif
|
||
ssize_t linksize;
|
||
|
||
if ((linksize = readlink(exepath, destpath, sizeof(destpath) - 1)) != -1) {
|
||
/* readlink() does not NULL-terminate strings, so we have to. */
|
||
destpath[linksize] = '\0';
|
||
|
||
return destpath;
|
||
}
|
||
#endif
|
||
|
||
/* argv[0] is most likely a full path if it starts with a slash. */
|
||
if (argv0[0] == '/')
|
||
return argv0;
|
||
|
||
/* if argv[0] contains a /, prepend the working directory */
|
||
if (strchr(argv0, '/') != NULL &&
|
||
getcwd(tmp, sizeof(tmp)) != NULL) {
|
||
snprintf(destpath, sizeof(destpath), "%s/%s", tmp, argv0);
|
||
return destpath;
|
||
}
|
||
|
||
/* Fall back to searching $PATH (or _CS_PATH in absence of $PATH). */
|
||
char *path = getenv("PATH");
|
||
size_t pathlen;
|
||
if (path == NULL) {
|
||
/* _CS_PATH is typically something like "/bin:/usr/bin" */
|
||
pathlen = confstr(_CS_PATH, tmp, sizeof(tmp));
|
||
sasprintf(&path, ":%s", tmp);
|
||
} else {
|
||
pathlen = strlen(path);
|
||
path = strdup(path);
|
||
}
|
||
const char *component;
|
||
char *str = path;
|
||
while (1) {
|
||
if ((component = strtok(str, ":")) == NULL)
|
||
break;
|
||
str = NULL;
|
||
snprintf(destpath, sizeof(destpath), "%s/%s", component, argv0);
|
||
/* Of course this is not 100% equivalent to actually exec()ing the
|
||
* binary, but meh. */
|
||
if (access(destpath, X_OK) == 0) {
|
||
free(path);
|
||
return destpath;
|
||
}
|
||
}
|
||
free(path);
|
||
|
||
/* Last resort: maybe it’s in /usr/bin? */
|
||
return "/usr/bin/i3bar";
|
||
}
|