github.com/YosysHQ.yosys
1
0
Fork 0
mirror of synced 2026-05-08 00:36:50 +00:00
Code Issues Releases Wiki Activity

Merge pull request #5816 from petterreinholdtsen/proc-no-path-max

Browse Source 
Rewrote Linux edition of proc_self_dirname() to handle any symlink length.
This commit is contained in:
Emil J
2026-04-20 09:47:59 +00:00
committed by GitHub
parent 33fba24158 89d360aa4a
commit 22ef992189
1 changed files with 19 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
kernel/yosys.cc
View File

@@ -471,17 +471,30 @@ struct TclPass : public Pass {
#endif
#if defined(__linux__) || defined(__CYGWIN__)
#if defined(__linux__) || defined(__CYGWIN__) || defined(__gnu_hurd__)
std::string proc_self_dirname()
{
char path[PATH_MAX];
ssize_t buflen = readlink("/proc/self/exe", path, sizeof(path));
std::string path(4096, '\0');
ssize_t buflen = -1;
// Double until sucess, while avoiding endless loop. Give up
// when symlink is longer than 4096*(2^30) = 4398046511104
// bytes.
for (int tries = 30; 0 < tries; tries--) {
buflen = readlink("/proc/self/exe", path.data(), path.size());
if (buflen < (ssize_t)path.size())
break;
else
path.resize(path.size() * 2);
}
if (buflen < 0) {
log_error("readlink(\"/proc/self/exe\") failed: %s\n", strerror(errno));
path.resize(0);
} else {
while (buflen > 0 && path[buflen-1] != '/')
buflen--;
path.resize(buflen);
}
while (buflen > 0 && path[buflen-1] != '/')
buflen--;
return std::string(path, buflen);
return path;
}
#elif defined(__FreeBSD__) || defined(__NetBSD__)
std::string proc_self_dirname()