1 /* Definitions for managing subprocesses in GNU Make.
2 Copyright (C) 1992-2020 Free Software Foundation, Inc.
3 This file is part of GNU Make.
4 
5 GNU Make is free software; you can redistribute it and/or modify it under the
6 terms of the GNU General Public License as published by the Free Software
7 Foundation; either version 3 of the License, or (at your option) any later
8 version.
9 
10 GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
11 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12 A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
13 
14 You should have received a copy of the GNU General Public License along with
15 this program.  If not, see <http://www.gnu.org/licenses/>.  */
16 
17 #include "output.h"
18 
19 /* Structure describing a running or dead child process.  */
20 
21 #ifdef VMS
22 #define VMSCHILD                                                        \
23     char *comname;              /* Temporary command file name */       \
24     int efn;                    /* Completion event flag number */      \
25     int cstatus;                /* Completion status */                 \
26     int vms_launch_status;      /* non-zero if lib$spawn, etc failed */
27 #else
28 #define VMSCHILD
29 #endif
30 
31 #define CHILDBASE                                               \
32     char *cmd_name;       /* Alloced copy of command run.  */   \
33     char **environment;   /* Environment for commands. */       \
34     VMSCHILD                                                    \
35     struct output output  /* Output for this child.  */
36 
37 
38 struct childbase
39   {
40     CHILDBASE;
41   };
42 
43 struct child
44   {
45     CHILDBASE;
46 
47     struct child *next;         /* Link in the chain.  */
48 
49     struct file *file;          /* File being remade.  */
50 
51     char *sh_batch_file;        /* Script file for shell commands */
52     char **command_lines;       /* Array of variable-expanded cmd lines.  */
53     char *command_ptr;          /* Ptr into command_lines[command_line].  */
54 
55     unsigned int  command_line; /* Index into command_lines.  */
56 
57     pid_t pid;                  /* Child process's ID number.  */
58 
59     unsigned int  remote:1;     /* Nonzero if executing remotely.  */
60     unsigned int  noerror:1;    /* Nonzero if commands contained a '-'.  */
61     unsigned int  good_stdin:1; /* Nonzero if this child has a good stdin.  */
62     unsigned int  deleted:1;    /* Nonzero if targets have been deleted.  */
63     unsigned int  recursive:1;  /* Nonzero for recursive command ('+' etc.)  */
64     unsigned int  jobslot:1;    /* Nonzero if it's reserved a job slot.  */
65     unsigned int  dontcare:1;   /* Saved dontcare flag.  */
66   };
67 
68 extern struct child *children;
69 
70 /* A signal handler for SIGCHLD, if needed.  */
71 RETSIGTYPE child_handler (int sig);
72 int is_bourne_compatible_shell(const char *path);
73 void new_job (struct file *file);
74 void reap_children (int block, int err);
75 void start_waiting_jobs (void);
76 
77 char **construct_command_argv (char *line, char **restp, struct file *file,
78                                int cmd_flags, char** batch_file);
79 
80 pid_t child_execute_job (struct childbase *child, int good_stdin, char **argv);
81 
82 #ifdef _AMIGA
83 void exec_command (char **argv) NORETURN;
84 #elif defined(__EMX__)
85 int exec_command (char **argv, char **envp);
86 #else
87 void exec_command (char **argv, char **envp) NORETURN;
88 #endif
89 
90 void unblock_all_sigs (void);
91 
92 extern unsigned int job_slots_used;
93 extern unsigned int jobserver_tokens;
94