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[DragonFly BSD] Use Proper CWD From PID Code

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This commit is contained in:
Samuel Venable
2024-08-05 19:53:05 -04:00
committed by Klemens Morgenstern
parent 211a3134b6
commit f741b0d120
1 changed files with 8 additions and 45 deletions
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53
src/ext/cwd.cpp
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@@ -46,8 +46,10 @@
#endif
#if defined(__DragonFly__)
#include <climits>
#include <cstring>
#include <cstdio>
#include <sys/types.h>
#include <sys/sysctl.h>
#endif
#ifdef BOOST_PROCESS_USE_STD_FS
@@ -152,53 +154,14 @@ filesystem::path cwd(boost::process::v2::pid_type pid, boost::system::error_code
filesystem::path cwd(boost::process::v2::pid_type pid, boost::system::error_code & ec)
{
/*
filesystem::path path;
// Official API (broken OS-level) - including code from DragonFly's fstat(1)
// command line interface utility currently requires way too much code FWIW.
std::size_t sz = 4, len = 0;
char buffer[PATH_MAX];
std::size_t sz = 4, len = sizeof(buffer);
int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_CWD, pid};
if (sysctl(mib, sz, nullptr, &len, nullptr, 0) == 0)
if (sysctl(mib, sz, buffer, &len, nullptr, 0) == 0)
{
std::vector<char> vecbuff;
vecbuff.resize(len);
if (sysctl(mib, sz, &vecbuff[0], &len, nullptr, 0) == 0)
{
path = filesystem::canonical(&vecbuff[0], ec);
}
else
BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)
}
else
BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)
return path;
*/
filesystem::path path;
/* Probably the hackiest thing ever we are doing here, because the official API is broken OS-level. */
FILE *fp = popen(("pos=`ans=\\`/usr/bin/fstat -w -p " + std::to_string(pid) + " | /usr/bin/sed -n 1p\\`; " +
"/usr/bin/awk -v ans=\"$ans\" 'BEGIN{print index(ans, \"INUM\")}'`; str=`/usr/bin/fstat -w -p " +
std::to_string(pid) + " | /usr/bin/sed -n 3p`; /usr/bin/awk -v str=\"$str\" -v pos=\"$pos\" " +
"'BEGIN{print substr(str, 0, pos + 4)}' | /usr/bin/awk 'NF{NF--};1 {$1=$2=$3=$4=\"\"; print" +
" substr($0, 5)'}").c_str(), "r");
if (fp)
{
char buffer[PATH_MAX];
if (fgets(buffer, sizeof(buffer), fp))
{
std::string str = buffer;
std::size_t pos = str.find("\n", strlen(buffer) - 1);
if (pos != std::string::npos)
{
str.replace(pos, 1, "");
}
path = filesystem::canonical(str.c_str(), ec);
}
else
BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)
if (pclose(fp) == -1)
BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)
}
path = filesystem::canonical(buffer, ec);
}
else
BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)
return path;