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fd1dd7c398
Testing has shown that vfork() is actually significantly more efficient on systems where it's supported, even for copy-on-write implementations. If make is big enough, duplicating the page tables is significant overhead. * configure.ac: Check for fork/vfork. * makeint.h: Include vfork.h and set up #define for it. * os.h, posixos.c (get_bad_stdin): For children who can't use the normal stdin file descriptor, get a broken one. * job.c (start_job_command): Avoid so many ifdefs and simplify the invocation of child_execute_job() (child_execute_job): move the fork operation here so it can return early for the parent process. Switch to use vfork(). * function.c (func_shell_base): Use new child_execute_job() and simplify ifdefs. * job.h, main.c, remote-cstms.c, vmsjobs.c, w32os.c: Update declarations and calls.
159 lines
5 KiB
C
159 lines
5 KiB
C
/* Definitions for managing subprocesses in GNU Make.
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Copyright (C) 1992-2016 Free Software Foundation, Inc.
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This file is part of GNU Make.
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GNU Make is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3 of the License, or (at your option) any later
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version.
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GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "output.h"
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#ifdef HAVE_FCNTL_H
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# include <fcntl.h>
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#else
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# include <sys/file.h>
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#endif
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/* How to set close-on-exec for a file descriptor. */
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#if !defined(F_SETFD) || !defined(F_GETFD)
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# ifdef WINDOWS32
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# define CLOSE_ON_EXEC(_d) process_noinherit(_d)
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# else
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# define CLOSE_ON_EXEC(_d)
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# endif
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#else
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# ifndef FD_CLOEXEC
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# define FD_CLOEXEC 1
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# endif
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# define CLOSE_ON_EXEC(_d) (void) fcntl ((_d), F_SETFD, FD_CLOEXEC)
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#endif
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#ifdef NO_OUTPUT_SYNC
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# define RECORD_SYNC_MUTEX(m) \
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O (error, NILF, \
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_("-O[TYPE] (--output-sync[=TYPE]) is not configured for this build."));
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#else
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# ifdef WINDOWS32
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/* For emulations in w32/compat/posixfcn.c. */
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# define F_GETFD 1
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# define F_SETLKW 2
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/* Implementation note: None of the values of l_type below can be zero
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-- they are compared with a static instance of the struct, so zero
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means unknown/invalid, see w32/compat/posixfcn.c. */
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# define F_WRLCK 1
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# define F_UNLCK 2
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struct flock
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{
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short l_type;
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short l_whence;
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off_t l_start;
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off_t l_len;
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pid_t l_pid;
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};
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/* This type is actually a HANDLE, but we want to avoid including
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windows.h as much as possible. */
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typedef intptr_t sync_handle_t;
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/* Public functions emulated/provided in posixfcn.c. */
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int fcntl (intptr_t fd, int cmd, ...);
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intptr_t create_mutex (void);
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int same_stream (FILE *f1, FILE *f2);
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# define RECORD_SYNC_MUTEX(m) record_sync_mutex(m)
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void record_sync_mutex (const char *str);
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void prepare_mutex_handle_string (intptr_t hdl);
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# else /* !WINDOWS32 */
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typedef int sync_handle_t; /* file descriptor */
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# define RECORD_SYNC_MUTEX(m) (void)(m)
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# endif
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#endif /* !NO_OUTPUT_SYNC */
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/* Structure describing a running or dead child process. */
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struct child
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{
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struct child *next; /* Link in the chain. */
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struct file *file; /* File being remade. */
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char **environment; /* Environment for commands. */
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char *sh_batch_file; /* Script file for shell commands */
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char **command_lines; /* Array of variable-expanded cmd lines. */
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char *command_ptr; /* Ptr into command_lines[command_line]. */
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#ifdef VMS
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char *comname; /* Temporary command file name */
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int efn; /* Completion event flag number */
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int cstatus; /* Completion status */
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int vms_launch_status; /* non-zero if lib$spawn, etc failed */
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#endif
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unsigned int command_line; /* Index into command_lines. */
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struct output output; /* Output for this child. */
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pid_t pid; /* Child process's ID number. */
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unsigned int remote:1; /* Nonzero if executing remotely. */
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unsigned int noerror:1; /* Nonzero if commands contained a '-'. */
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unsigned int good_stdin:1; /* Nonzero if this child has a good stdin. */
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unsigned int deleted:1; /* Nonzero if targets have been deleted. */
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unsigned int recursive:1; /* Nonzero for recursive command ('+' etc.) */
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unsigned int dontcare:1; /* Saved dontcare flag. */
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};
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extern struct child *children;
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/* A signal handler for SIGCHLD, if needed. */
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RETSIGTYPE child_handler (int sig);
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int is_bourne_compatible_shell(const char *path);
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void new_job (struct file *file);
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void reap_children (int block, int err);
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void start_waiting_jobs (void);
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char **construct_command_argv (char *line, char **restp, struct file *file,
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int cmd_flags, char** batch_file);
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#ifdef VMS
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int child_execute_job (struct child *child, char *argv);
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#else
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# define FD_STDIN (fileno (stdin))
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# define FD_STDOUT (fileno (stdout))
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# define FD_STDERR (fileno (stderr))
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int child_execute_job (struct output *out, int good_stdin, char **argv, char **envp);
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#endif
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#ifdef _AMIGA
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void exec_command (char **argv) __attribute__ ((noreturn));
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#elif defined(__EMX__)
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int exec_command (char **argv, char **envp);
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#else
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void exec_command (char **argv, char **envp) __attribute__ ((noreturn));
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#endif
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extern unsigned int job_slots_used;
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void block_sigs (void);
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#ifdef POSIX
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void unblock_sigs (void);
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#else
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#ifdef HAVE_SIGSETMASK
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extern int fatal_signal_mask;
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#define unblock_sigs() sigsetmask (0)
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#else
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#define unblock_sigs()
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#endif
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#endif
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extern unsigned int jobserver_tokens;
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