#ifndef _SYSTEM_H_e18ede92_
#define _SYSTEM_H_e18ede92_

/* Arguments to system_lock. */
#define SYS_NOWAIT    0x00000001 /* don't block */
#define SYS_WAIT      0x00000002 /* can block */
#define SYS_SHARED    0x00000004 /* get shared lock */
#define SYS_EXCLUSIVE 0x00000008 /* get exclusive lock */
#define SYS_FAILEXIT  0x00000010 /* fprintf() and exit() on failure */

#include "profile.h"

/* Returns "the system profile"; on first call, calls profile_read(0)
   and saves that as "the system profile" and returns it.  If no profile
   is available, prints a gripe and exit(1)s. */
extern PROFILE *system_get_profile(void);

/* Returns the system's idea of the user's homedir, namely, $HOME, or
   "." if $HOME is not set. */
extern const char *system_homedir(void);

/* Returns <mmdir>. */
extern const char *system_mmdir(void);

/* Returns folder directory. */
extern const char *system_folder_dir(void);

/* Locks the whole mail system for the calling process.  Argument is
   SYS_WAIT or SYS_NOWAIT, |ed with SYS_SHARED or SYS_EXCLUSIVE.  Returns
   -1 and sets errno for failure, 0 for success; if SYS_WAIT set, blocks
   until it gets the lock.  Optinally include SYS_FAILEXIT, in which case
   system_lock() will fprintf(stderr,...) and exit() on failure. */
extern int system_lock(unsigned int);

/* Unlocks the lock set by system_lock(). */
extern void system_unlock(void);

#endif