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chg: extract the logic of setting FD_CLOEXEC to a utility function...

chg: extract the logic of setting FD_CLOEXEC to a utility function Setting FD_CLOEXEC is useful for other fds such like lockfd and sockdirfd, move the logic from hgc_open to util.

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      /*

       * Utility functions

       *

       * Copyright (c) 2011 Yuya Nishihara <yuya@tcha.org>

       *

       * This software may be used and distributed according to the terms of the

       * GNU General Public License version 2 or any later version.

       */

      #ifndef UTIL_H_

      #define UTIL_H_

      #ifdef __GNUC__

      #define PRINTF_FORMAT_ __attribute__((format(printf, 1, 2)))

      #else

      #define PRINTF_FORMAT_

      #endif

      void abortmsg(const char *fmt, ...) PRINTF_FORMAT_;

      void abortmsgerrno(const char *fmt, ...) PRINTF_FORMAT_;

      void enablecolor(void);

      void enabledebugmsg(void);

      void debugmsg(const char *fmt, ...) PRINTF_FORMAT_;

      void fchdirx(int dirfd);

      void fsetcloexec(int fd);

      void *mallocx(size_t size);

      void *reallocx(void *ptr, size_t size);

      int runshellcmd(const char *cmd, const char *envp[], const char *cwd);

      #endif  /* UTIL_H_ */

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				/*
				* Utility functions
				*
				* Copyright (c) 2011 Yuya Nishihara <yuya@tcha.org>
				*
				* This software may be used and distributed according to the terms of the
				* GNU General Public License version 2 or any later version.
				*/

				#ifndef UTIL_H_
				#define UTIL_H_

				#ifdef __GNUC__
				#define PRINTF_FORMAT_ __attribute__((format(printf, 1, 2)))
				#else
				#define PRINTF_FORMAT_
				#endif

				void abortmsg(const char *fmt, ...) PRINTF_FORMAT_;
				void abortmsgerrno(const char *fmt, ...) PRINTF_FORMAT_;

				void enablecolor(void);
				void enabledebugmsg(void);
				void debugmsg(const char *fmt, ...) PRINTF_FORMAT_;

				void fchdirx(int dirfd);
				void fsetcloexec(int fd);
				void *mallocx(size_t size);
				void reallocx(void ptr, size_t size);

				int runshellcmd(const char cmd, const char envp[], const char *cwd);

				#endif /* UTIL_H_ */