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Update get_executable_path() for FreeBSD

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Remove dependency on the Linux compatibility layer's procfs being
installed and mounted when running under FreeBSD by directly querying
the MIB for the path to the running fish executable
(KERN_PROC_PATHNAME). Tested under FreeBSD 11.2-RELEASE.
This commit is contained in:
Mahmoud Al-Qudsi 2018-10-09 19:47:49 -05:00
parent 6a9f0fc0c1
commit 236556ba05
1 changed files with 19 additions and 2 deletions
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21
src/fish.cpp
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@ -54,6 +54,10 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
#include "signal.h"
#include "wutil.h" // IWYU pragma: keep
#ifdef __FreeBSD__
#include <sys/sysctl.h>
#endif
// PATH_MAX may not exist.
#ifndef PATH_MAX
#define PATH_MAX 4096
@ -104,12 +108,25 @@ static std::string get_executable_path(const char *argv0) {
// https://opensource.apple.com/source/adv_cmds/adv_cmds-163/ps/print.c
uint32_t buffSize = sizeof buff;
if (_NSGetExecutablePath(buff, &buffSize) == 0) return std::string(buff);
#elif __FreeBSD__
// FreeBSD does not have /proc by default, but it can be mounted as procfs via the
// Linux compatibility layer. Per sysctl(3), passing in a process ID of -1 returns
// the value for the current process.
size_t buff_size = sizeof buff;
int name[] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
int result = sysctl(name, sizeof(name) / sizeof(int), buff, &buff_size, nullptr, 0);
if (result != 0) {
wperror(L"sysctl KERN_PROC_PATHNAME");
}
else {
return std::string(buff);
}
#else
// On non-OS X UNIXes, try /proc directory.
// On other unixes, fall back to the Linux-ish /proc/ directory
ssize_t len;
len = readlink("/proc/self/exe", buff, sizeof buff - 1); // Linux
if (len == -1) {
len = readlink("/proc/curproc/file", buff, sizeof buff - 1); // BSD
len = readlink("/proc/curproc/file", buff, sizeof buff - 1); // other BSDs
if (len == -1) {
len = readlink("/proc/self/path/a.out", buff, sizeof buff - 1); // Solaris
}