Add Linux cwd process column

linux/LinuxProcess.c

@@ -115,6 +115,7 @@ ProcessFieldData Process_fields[] = {
    [SECATTR] = { .name = "SECATTR", .title = " Security Attribute ", .description = "Security attribute of the process (e.g. SELinux or AppArmor)", .flags = PROCESS_FLAG_LINUX_SECATTR, },
    [PROC_COMM] = { .name = "COMM", .title = "COMM            ", .description = "comm string of the process from /proc/[pid]/comm", .flags = 0, },
    [PROC_EXE] = { .name = "EXE", .title = "EXE             ", .description = "Basename of exe of the process from /proc/[pid]/exe", .flags = 0, },
+   [CWD] = { .name ="CWD", .title = "CWD                       ", .description = "The current working directory of the process", .flags = PROCESS_FLAG_LINUX_CWD, },
    [LAST_PROCESSFIELD] = { .name = "*** report bug! ***", .title = NULL, .description = NULL, .flags = 0, },
 };
 
@@ -156,6 +157,7 @@ void Process_delete(Object* cast) {
 #ifdef HAVE_OPENVZ
    free(this->ctid);
 #endif
+   free(this->cwd);
    free(this->secattr);
    free(this->ttyDevice);
    free(this->procExe);
@@ -739,6 +741,17 @@ static void LinuxProcess_writeField(const Process* this, RichString* str, Proces
       }
       break;
    }
+   case CWD:
+      if (!lp->cwd) {
+         xSnprintf(buffer, n, "%-25s ", "N/A");
+         attr = CRT_colors[PROCESS_SHADOW];
+      } else if (String_startsWith(lp->cwd, "/proc/") && strstr(lp->cwd, " (deleted)") != NULL) {
+         xSnprintf(buffer, n, "%-25s ", "main thread terminated");
+         attr = CRT_colors[PROCESS_SHADOW];
+      } else {
+         xSnprintf(buffer, n, "%-25.25s ", lp->cwd);
+      }
+      break;
    default:
       Process_writeField(this, str, field);
       return;
@@ -841,6 +854,8 @@ static long LinuxProcess_compare(const void* v1, const void* v2) {
       const char *exe2 = p2->procExe ? (p2->procExe + p2->procExeBasenameOffset) : (Process_isKernelThread(p2) ? kthreadID : "");
       return strcmp(exe1, exe2);
    }
+   case CWD:
+      return SPACESHIP_NULLSTR(p1->cwd, p2->cwd);
    default:
       return Process_compare(v1, v2);
    }

linux/LinuxProcess.h

@@ -28,6 +28,7 @@ in the source distribution for its full text.
 #define PROCESS_FLAG_LINUX_CTXT     0x00004000
 #define PROCESS_FLAG_LINUX_SECATTR  0x00008000
 #define PROCESS_FLAG_LINUX_LRS_FIX  0x00010000
+#define PROCESS_FLAG_LINUX_CWD      0x00020000
 
 typedef enum UnsupportedProcessFields {
    FLAGS = 9,
@@ -94,7 +95,8 @@ typedef enum LinuxProcessFields {
    SECATTR = 123,
    PROC_COMM = 124,
    PROC_EXE = 125,
-   LAST_PROCESSFIELD = 126,
+   CWD = 126,
+   LAST_PROCESSFIELD = 127,
 } LinuxProcessField;
 
 /* LinuxProcessMergedCommand is populated by LinuxProcess_makeCommandStr: It
@@ -181,6 +183,7 @@ typedef struct LinuxProcess_ {
    unsigned long ctxt_diff;
    char* secattr;
    unsigned long long int last_mlrs_calctime;
+   char* cwd;
 } LinuxProcess;
 
 #define Process_isKernelThread(_process) (((const LinuxProcess*)(_process))->isKernelThread)

linux/LinuxProcessList.c

@@ -882,6 +882,31 @@ static void LinuxProcessList_readSecattrData(LinuxProcess* process, openat_arg_t
    process->secattr = xStrdup(buffer);
 }
 
+static void LinuxProcessList_readCwd(LinuxProcess* process, openat_arg_t procFd) {
+   char pathBuffer[PATH_MAX + 1];
+
+#if defined(HAVE_READLINKAT) && defined(HAVE_OPENAT)
+   ssize_t r = readlinkat(procFd, "cwd", pathBuffer, sizeof(pathBuffer) - 1);
+#else
+   char filename[MAX_NAME + 1];
+   xSnprintf(filename, sizeof(filename), "%s/cwd", procFd);
+   ssize_t r = readlink(filename, pathBuffer, sizeof(pathBuffer) - 1);
+#endif
+   if (r < 0) {
+      free(process->cwd);
+      process->cwd = NULL;
+      return;
+   }
+
+   pathBuffer[r] = '\0';
+
+   if (process->cwd && String_eq(process->cwd, pathBuffer))
+      return;
+
+   free(process->cwd);
+   process->cwd = xStrdup(pathBuffer);
+}
+
 #ifdef HAVE_DELAYACCT
 
 static int handleNetlinkMsg(struct nl_msg* nlmsg, void* linuxProcess) {
@@ -1404,6 +1429,10 @@ static bool LinuxProcessList_recurseProcTree(LinuxProcessList* this, openat_arg_
          LinuxProcessList_readSecattrData(lp, procFd);
       }
 
+      if (settings->flags & PROCESS_FLAG_LINUX_CWD) {
+         LinuxProcessList_readCwd(lp, procFd);
+      }
+
       if (proc->state == 'Z' && (proc->basenameOffset == 0)) {
          proc->basenameOffset = -1;
          setCommand(proc, command, commLen);