[C언어] 리눅스 프로세스 이름으로 프로세스 아이디(PID) 구하기

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#include <stdio.h> #include <dirent.h> #include <string.h>   static int which_number (char *s) {     int len, i;       len = strlen (s);       for (i = 0; i < len; i++)         if ((s[i] < '0' || s[i] > '9'))             return -1;       return atoi (s); }   int get_pid_from_proc_by_name (char *str) {     DIR *dp;     struct dirent *dir;     char buf[100], line[1024], tag[100], name[100];     int pid;     FILE *fp;       dp = opendir ("/proc");     if (!dp)         return -1;       while ((dir = readdir (dp)))     {            pid = which_number (dir->d_name);           if (pid == -1)             continue;           /* Open /proc/pid/status file. */         snprintf (buf, 100, "/proc/%d/status", pid);         fp = fopen (buf, "r");         if (fp == NULL)             continue;           /* Get first line with name. */         fgets (line, 1024, fp);           /* Close stream. */         fclose (fp);           sscanf (line, "%s %s", tag, name);         if (!strcmp (name, str))         {                closedir(dp);             return pid;         }        }          closedir(dp);     return -1; }