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#include <stddef.h> /* NULL */
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#include <string.h> /* strlen(), memcmp() */
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#include <stdio.h> /* asprintf(), perror() */
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#include <stdio.h> /* asprintf(), perror(), sscanf() */
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#include <unistd.h> /* close(), write(), readlink(),
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read(), STDOUT_FILENO, sleep(),
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fork(), setuid(), geteuid(),
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setsid(), chdir(), dup2(),
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STDERR_FILENO, execv() */
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#include <stdlib.h> /* free(), EXIT_FAILURE, strtoul(),
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realloc(), EXIT_SUCCESS, malloc(),
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#include <stdlib.h> /* free(), EXIT_FAILURE, realloc(),
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EXIT_SUCCESS, malloc(), _exit() */
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#include <stdlib.h> /* getenv() */
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#include <dirent.h> /* opendir(), readdir(), closedir() */
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#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK */
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for(struct dirent *proc_ent = readdir(proc_dir);
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proc_ent != NULL;
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proc_ent = readdir(proc_dir)){
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pid_t pid = (pid_t) strtoul(proc_ent->d_name, NULL, 10);
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/* In the GNU C library, pid_t is always int */
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ret = sscanf(proc_ent->d_name, "%d", &pid);
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/* Not a process */