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/* -*- coding: utf-8 -*- */
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* Passprompt - Read a password from usplash and output it
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* Usplash - Read a password from usplash and output it
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* Copyright © 2008 Teddy Hogeborn
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* Copyright © 2008 Björn Påhlsson
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* Copyright © 2008,2009 Teddy Hogeborn
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* Copyright © 2008,2009 Björn Påhlsson
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* This program is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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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 <inttypes.h> /* intmax_t, SCNdMAX */
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#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK */
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sig_atomic_t interrupted_by_signal = 0;
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size_t written = 0;
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while(not interrupted_by_signal and written < cmd_line_len){
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ret = write(fifo_fd, cmd_line + written,
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cmd_line_len - written);
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sret = write(fifo_fd, cmd_line + written,
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cmd_line_len - written);
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if(errno != EINTR or interrupted_by_signal){
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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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ret = sscanf(proc_ent->d_name, "%" SCNdMAX "%n", &tmpmax,
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if(ret < 1 or tmpmax != (pid_t)tmpmax
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or proc_ent->d_name[numchars] != '\0'){
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/* Find the executable name by doing readlink() on the
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/proc/<pid>/exe link */
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sret = readlink(exe_link, exe_target, sizeof(exe_target));
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if((sret == ((ssize_t)sizeof(exe_target)-1))
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and (memcmp(usplash_name, exe_target,