[linux] 유닉스 / 리눅스에서 프로세스의 경로를 얻는 방법

조금 늦었지만 모든 답변은 Linux에만 해당됩니다.

유닉스도 필요하다면 다음이 필요합니다.

char * getExecPath (char * path,size_t dest_len, char * argv0)
{
    char * baseName = NULL;
    char * systemPath = NULL;
    char * candidateDir = NULL;

    /* the easiest case: we are in linux */
    size_t buff_len;
    if (buff_len = readlink ("/proc/self/exe", path, dest_len - 1) != -1)
    {
        path [buff_len] = '\0';
        dirname (path);
        strcat  (path, "/");
        return path;
    }

    /* Ups... not in linux, no  guarantee */

    /* check if we have something like execve("foobar", NULL, NULL) */
    if (argv0 == NULL)
    {
        /* we surrender and give current path instead */
        if (getcwd (path, dest_len) == NULL) return NULL;
        strcat  (path, "/");
        return path;
    }


    /* argv[0] */
    /* if dest_len < PATH_MAX may cause buffer overflow */
    if ((realpath (argv0, path)) && (!access (path, F_OK)))
    {
        dirname (path);
        strcat  (path, "/");
        return path;
    }

    /* Current path */
    baseName = basename (argv0);
    if (getcwd (path, dest_len - strlen (baseName) - 1) == NULL)
        return NULL;

    strcat (path, "/");
    strcat (path, baseName);
    if (access (path, F_OK) == 0)
    {
        dirname (path);
        strcat  (path, "/");
        return path;
    }

    /* Try the PATH. */
    systemPath = getenv ("PATH");
    if (systemPath != NULL)
    {
        dest_len--;
        systemPath = strdup (systemPath);
        for (candidateDir = strtok (systemPath, ":"); candidateDir != NULL; candidateDir = strtok (NULL, ":"))
        {
            strncpy (path, candidateDir, dest_len);
            strncat (path, "/", dest_len);
            strncat (path, baseName, dest_len);

            if (access(path, F_OK) == 0)
            {
                free (systemPath);
                dirname (path);
                strcat  (path, "/");
                return path;
            }
        }
        free(systemPath);
        dest_len++;
    }

    /* again someone has use execve: we dont knowe the executable name; we surrender and give instead current path */
    if (getcwd (path, dest_len - 1) == NULL) return NULL;
    strcat  (path, "/");
    return path;
}

편집 : Mark lakata가보고 한 버그를 수정했습니다.

답변

ps -ef | grep 786

import os
print os.path.join('/proc', str(os.getpid()))

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>


int
main(int argc, char **argv)
{
    pid_t pid = getpid();

    fprintf(stdout, "Path to current process: '/proc/%d/'\n", (int)pid);

    return EXIT_SUCCESS;
}

gcc -Wall -Werror -g -ansi -pedantic process_path.c -oprocess_path