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openbsd: poor man implementation for getting executable path

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it tries to get executable path from argv[0]. it is unreliable and unsecure, but should be fine enough for the considered use-case. it still doesn't address all possible cases.
This commit is contained in:
Sébastien Marie
2022-02-26 08:19:41 +00:00
parent ae5cb09041
commit 8e270d3a99
1 changed files with 30 additions and 3 deletions
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src/build_settings.cpp
+30 -3
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@@ -1,4 +1,4 @@
#if defined(GB_SYSTEM_FREEBSD)
#if defined(GB_SYSTEM_FREEBSD) || defined(GB_SYSTEM_OPENBSD)
#include <sys/types.h>
#include <sys/sysctl.h>
#endif
@@ -734,9 +734,36 @@ String internal_odin_root_dir(void) {
len = readlink("/proc/curproc/exe", &path_buf[0], path_buf.count);
#elif defined(GB_SYSTEM_DRAGONFLYBSD)
len = readlink("/proc/curproc/file", &path_buf[0], path_buf.count);
#else
// XXX OpenBSD
#elif defined(GB_SYSTEM_LINUX)
len = readlink("/proc/self/exe", &path_buf[0], path_buf.count);
#elif defined(GB_SYSTEM_OPENBSD)
int error;
int mib[] = {
CTL_KERN,
KERN_PROC_ARGS,
getpid(),
KERN_PROC_ARGV,
};
// get argv size
error = sysctl(mib, 4, NULL, (size_t *) &len, NULL, 0);
if (error == -1) {
// sysctl error
return make_string(nullptr, 0);
}
// get argv
char **argv = (char **)gb_malloc(len);
error = sysctl(mib, 4, argv, (size_t *) &len, NULL, 0);
if (error == -1) {
// sysctl error
gb_mfree(argv);
return make_string(nullptr, 0);
}
// copy argv[0] to path_buf
len = gb_strlen(argv[0]);
if(len < path_buf.count) {
gb_memmove(&path_buf[0], argv[0], len);
}
gb_mfree(argv);
#endif
if(len == 0 || len == -1) {
return make_string(nullptr, 0);