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/* Declarations for operating system interfaces for GNU Make.
Copyright (C) 2016-2023 Free Software Foundation, Inc.
This file is part of GNU Make.
GNU Make is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3 of the License, or (at your option) any later
version.
GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <https://www.gnu.org/licenses/>. */
#define IO_UNKNOWN 0x0001
#define IO_COMBINED_OUTERR 0x0002
#define IO_STDIN_OK 0x0004
#define IO_STDOUT_OK 0x0008
#define IO_STDERR_OK 0x0010
#if MK_OS_VMS || defined(__MSDOS__)
# define check_io_state() (IO_STDIN_OK|IO_STDOUT_OK|IO_STDERR_OK)
# define fd_inherit(_i) (0)
# define fd_noinherit(_i) (0)
# define fd_set_append(_i) (void)(0)
# define os_anontmp() (-1)
#else
/* Determine the state of stdin/stdout/stderr. */
unsigned int check_io_state (void);
/* Set a file descriptor to close/not close in a subprocess. */
void fd_inherit (int);
void fd_noinherit (int);
/* If the file descriptor is for a file put it into append mode. */
void fd_set_append (int);
/* Return a file descriptor for a new anonymous temp file, or -1. */
int os_anontmp (void);
#endif
/* This section provides OS-specific functions to support the jobserver. */
#ifdef MAKE_JOBSERVER
/* Returns 1 if the jobserver is enabled, else 0. */
unsigned int jobserver_enabled (void);
/* Called in the parent make to set up the jobserver initially. */
unsigned int jobserver_setup (int job_slots, const char *style);
/* Called in a child instance to connect to the jobserver.
Return 1 if we got a valid auth, else 0. */
unsigned int jobserver_parse_auth (const char* auth);
/* Returns an allocated buffer used to pass to child instances. */
char *jobserver_get_auth (void);
/* Returns a pointer to a static string used to indicate that the child
cannot access the jobserver, or NULL if it always can. */
const char *jobserver_get_invalid_auth (void);
/* Clear this instance's jobserver configuration.
This method might be invoked from a signal handler. */
void jobserver_clear (void);
/* Recover all the jobserver tokens and return the number we got.
Will also run jobserver_clear() as a side-effect. */
unsigned int jobserver_acquire_all (void);
/* Release a jobserver token. If it fails and is_fatal is 1, fatal. */
void jobserver_release (int is_fatal);
/* Notify the jobserver that a child exited. */
void jobserver_signal (void);
/* Get ready to start a non-recursive child. */
void jobserver_pre_child (int);
/* Complete starting a non-recursive child. */
void jobserver_post_child (int);
/* Set up to acquire a new token. */
void jobserver_pre_acquire (void);
/* Wait until we can acquire a jobserver token.
TIMEOUT is 1 if we have other jobs waiting for the load to go down;
in this case we won't wait forever, so we can check the load.
Returns 1 if we got a token, or 0 if we stopped waiting due to a child
exiting or a timeout. */
unsigned int jobserver_acquire (int timeout);
#else
#define jobserver_enabled() (0)
#define jobserver_setup(_slots, _style) (0)
#define jobserver_parse_auth(_auth) (0)
#define jobserver_get_auth() (NULL)
#define jobserver_get_invalid_auth() (NULL)
#define jobserver_clear() (void)(0)
#define jobserver_release(_fatal) (void)(0)
#define jobserver_acquire_all() (0)
#define jobserver_signal() (void)(0)
#define jobserver_pre_child(_r) (void)(0)
#define jobserver_post_child(_r) (void)(0)
#define jobserver_pre_acquire() (void)(0)
#define jobserver_acquire(_tmout) (0)
#endif /* MAKE_JOBSERVER */
#ifndef NO_OUTPUT_SYNC
/* Returns 1 if output sync is enabled, else 0. */
unsigned int osync_enabled (void);
/* Called in the parent make to set up output sync initially. */
void osync_setup (void);
/* Returns an allocated buffer containing output sync info to pass to child
instances, or NULL if not needed. */
char *osync_get_mutex (void);
/* Called in a child instance to obtain info on the output sync mutex.
Return 1 if we got a valid mutex, else 0. */
unsigned int osync_parse_mutex (const char *mutex);
/* Clean up this instance's output sync facilities.
This method might be invoked from a signal handler. */
void osync_clear (void);
/* Acquire the output sync lock. This will wait until available.
Returns 0 if there was an error getting the semaphore. */
unsigned int osync_acquire (void);
/* Release the output sync lock. */
void osync_release (void);
#else
#define osync_enabled() (0)
#define osync_setup() (void)(0)
#define osync_get_mutex() (0)
#define osync_parse_mutex(_s) (0)
#define osync_clear() (void)(0)
#define osync_acquire() (1)
#define osync_release() (void)(0)
#endif /* NO_OUTPUT_SYNC */
/* Create a "bad" file descriptor for stdin when parallel jobs are run. */
#if MK_OS_VMS || MK_OS_W32 || defined(__MSDOS__)
# define get_bad_stdin() (-1)
#else
int get_bad_stdin (void);
#endif
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