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Fix main executable path name resolution on FreeBSD, patch by

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Ed Schouten!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65882 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-03-02 22:17:15 +00:00
parent e3d1b653be
commit 893a0f9f0e
1 changed files with 60 additions and 1 deletions
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61
lib/System/Unix/Path.inc
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@ -266,10 +266,69 @@ Path::GetCurrentDirectory() {
return Path(pathname);
}
#ifdef __FreeBSD__
static int
test_dir(char buf[PATH_MAX], char ret[PATH_MAX],
const char *dir, const char *bin)
{
struct stat sb;
snprintf(buf, PATH_MAX, "%s//%s", dir, bin);
if (realpath(buf, ret) == NULL)
return (1);
if (stat(buf, &sb) != 0)
return (1);
return (0);
}
static char *
getprogpath(char ret[PATH_MAX], const char *bin)
{
char *pv, *s, *t, buf[PATH_MAX];
/* First approach: absolute path. */
if (bin[0] == '/') {
if (test_dir(buf, ret, "/", bin) == 0)
return (ret);
return (NULL);
}
/* Second approach: relative path. */
if (strchr(bin, '/') != NULL) {
if (getcwd(buf, PATH_MAX) == NULL)
return (NULL);
if (test_dir(buf, ret, buf, bin) == 0)
return (ret);
return (NULL);
}
/* Third approach: $PATH */
if ((pv = getenv("PATH")) == NULL)
return (NULL);
s = pv = strdup(pv);
if (pv == NULL)
return (NULL);
while ((t = strsep(&s, ":")) != NULL) {
if (test_dir(buf, ret, t, bin) == 0) {
free(pv);
return (ret);
}
}
free(pv);
return (NULL);
}
#endif
/// GetMainExecutable - Return the path to the main executable, given the
/// value of argv[0] from program startup.
Path Path::GetMainExecutable(const char *argv0, void *MainAddr) {
#if defined(__linux__) || defined(__CYGWIN__)
#if defined(__FreeBSD__)
char exe_path[PATH_MAX];
if (getprogpath(exe_path, argv0) != NULL)
return Path(std::string(exe_path));
#elif defined(__linux__) || defined(__CYGWIN__)
char exe_path[MAXPATHLEN];
ssize_t len = readlink("/proc/self/exe", exe_path, sizeof(exe_path));
if (len > 0 && len < MAXPATHLEN - 1) {