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/************************************************************************
* This program is Copyright (C) 1986-1996 by Jonathan Payne. JOVE is *
* provided to you without charge, and with no warranty. You may give *
* away copies of JOVE, including sources, provided that this notice is *
* included in all the files. *
************************************************************************/
/* The diversity of process management is complicated and difficult to handle.
* - In some systems (noteably POSIX), a process id has type "pid_t"
* - V7 only has wait. POSIX has waitpid (with options). BSD has
* wait3. Someone has wait2.
* - The status result set by wait and used by WIF* has type
* "union wait" in BSD, but "int" everywhere else.
* - The WIF* functions are defined in <sys/wait.h> by BSD and POSIX.
* - WTERMSIG seems to be a creation of POSIX
* - Some systems have vfork(1) and perform better if it is used
* in place of fork(1).
*
* This header attempts to span this diversity. We provide:
* - POSIX pid_t
* - wait_opt, to accept options (and use them, if possible).
* - wait_status_t
* - WIF*
* - WTERMSIG
*/
#ifdef POSIX_PROCS
# include <sys/types.h> /* defines pid_t */
# include <sys/wait.h>
typedef int wait_status_t;
# define wait_opt(stat_loc, options) waitpid(-1, stat_loc, options)
#else /*!POSIX_PROCS*/
typedef int pid_t;
# ifdef BSD_WAIT
# include <sys/wait.h>
typedef union wait wait_status_t;
# ifndef WEXITSTATUS
# define WEXITSTATUS(w) ((w).w_retcode)
# endif
# ifndef WTERMSIG
# define WTERMSIG(w) ((w).w_termsig)
# endif
# ifndef WAIT3
# define wait_opt(stat_loc, options) wait2(stat_loc, options)
# else
# define wait_opt(stat_loc, options) wait3(stat_loc, options, (struct rusage *)NULL)
# endif
# else /*!BSD_WAIT*/
typedef int wait_status_t;
# ifdef UNIX
# define WIFSTOPPED(w) ((w & 0377) == 0177)
# define WIFEXITED(w) ((w & 0377) == 0)
# define WIFSIGNALED(w) (((w >> 8) & 0377) == 0)
# define WEXITSTATUS(w) ((w >> 8) & 0377)
# define WTERMSIG(w) (w & 0177)
# define wait_opt(stat_loc, options) wait(stat_loc)
# endif /* UNIX */
# endif /*!BSD_WAIT*/
#endif /*!POSIX_PROCS*/
#ifndef FULL_UNISTD
# ifndef POSIX_UNISTD
/* ??? pid_t may be changed by default argument promotions.
* If so, this prototype might be wrong.
*/
extern int kill proto((pid_t /*pid*/, int /*sig*/)); /* signal.h */
extern pid_t fork proto((void));
extern pid_t getpid proto((void));
extern int getuid proto((void));
extern int setuid proto((int));
# endif /* !POSIX_UNISTD */
# ifdef USE_VFORK
extern int UNMACRO(vfork) proto((void));
# endif
#endif /* !FULL_UNISTD */
/* This nest of #ifdefs is simply to define NEWPG() which makes
* the current process a process group leader of a new process group.
* ??? pid_t may be changed by default argument promotions.
* If so, this prototype might be wrong.
*/
#ifdef POSIX_PROCS
# ifndef FULL_UNISTD
extern int UNMACRO(setpgid) proto((pid_t /*pid*/, pid_t /*pgid*/));
# endif
# define NEWPG() setpgid(0, getpid())
#else /* !POSIX_PROCS */
# ifdef BSD_SETPGRP
# ifndef FULL_UNISTD
extern int UNMACRO(setpgrp) proto((pid_t /*pid*/, pid_t /*pgrp*/));
# endif
# define NEWPG() setpgrp(0, getpid())
# else /* !(defined(BSD_SETPGRP) || defined(POSIX_PROCS)) */
# ifndef FULL_UNISTD
extern int UNMACRO(setpgrp) proto((void));
# endif
# define NEWPG() setpgrp()
# endif /* !(defined(BSD_SETPGRP) || defined(POSIX_PROCS)) */
#endif /* !POSIX_PROCS */
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