212 lines
5.2 KiB
C++
212 lines
5.2 KiB
C++
/* child_info.h: shared child info for cygwin
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include <setjmp.h>
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enum child_info_types
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{
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_CH_NADA = 0,
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_CH_EXEC = 1,
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_CH_SPAWN = 2,
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_CH_FORK = 3,
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_CH_WHOOPS = 4
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};
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enum child_status
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{
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_CI_STRACED = 0x01,
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_CI_ISCYGWIN = 0x02,
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_CI_SAW_CTRL_C = 0x04,
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_CI_SILENTFAIL = 0x08
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};
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#define OPROC_MAGIC_MASK 0xff00ff00
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#define OPROC_MAGIC_GENERIC 0xaf00f000
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#ifdef __x86_64__
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#define PROC_MAGIC_GENERIC 0xaf00fa64
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#else /*!x86_64*/
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#define PROC_MAGIC_GENERIC 0xaf00fa32
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#endif
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#define EXEC_MAGIC_SIZE sizeof(child_info)
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/* Change this value if you get a message indicating that it is out-of-sync. */
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#define CURR_CHILD_INFO_MAGIC 0xacbf4682U
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#include "pinfo.h"
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struct cchildren
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{
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pid_t pid;
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pinfo_minimal p;
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};
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/* NOTE: Do not make gratuitous changes to the names or organization of the
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below class. The layout is checksummed to determine compatibility between
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different cygwin versions. */
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class child_info
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{
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public:
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DWORD msv_count; // set to 0
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DWORD cb; // size of this record
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DWORD intro; // improbable string
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DWORD magic; // magic number unique to child_info
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unsigned short type; // type of record, exec, spawn, fork
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init_cygheap *cygheap;
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void *cygheap_max;
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unsigned char flag;
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int retry; // number of times we've tried to start child process
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HANDLE rd_proc_pipe;
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HANDLE wr_proc_pipe;
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HANDLE subproc_ready; // used for synchronization with parent
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HANDLE user_h;
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HANDLE parent;
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DWORD parent_winpid;
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DWORD cygheap_reserve_sz;
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unsigned fhandler_union_cb;
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DWORD exit_code; // process exit code
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static int retry_count;// retry count;
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sigset_t sigmask;
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child_info (unsigned, child_info_types, bool);
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child_info (): subproc_ready (NULL), parent (NULL) {}
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~child_info ();
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void refresh_cygheap () { cygheap_max = ::cygheap_max; }
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void ready (bool);
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bool __reg3 sync (int, HANDLE&, DWORD);
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DWORD __reg2 proc_retry (HANDLE);
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bool isstraced () const {return !!(flag & _CI_STRACED);}
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bool iscygwin () const {return !!(flag & _CI_ISCYGWIN);}
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bool saw_ctrl_c () const {return !!(flag & _CI_SAW_CTRL_C);}
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bool silentfail () const {return !!(flag & _CI_SILENTFAIL);}
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void prefork (bool = false);
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void cleanup ();
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void postfork (pinfo& child)
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{
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ForceCloseHandle (wr_proc_pipe);
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wr_proc_pipe = NULL;
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child.set_rd_proc_pipe (rd_proc_pipe);
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rd_proc_pipe = NULL;
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}
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void silentfail (bool f)
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{
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if (f)
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flag |= _CI_SILENTFAIL;
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else
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flag &= ~_CI_SILENTFAIL;
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}
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};
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class mount_info;
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class child_info_fork: public child_info
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{
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public:
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HANDLE forker_finished;// for synchronization with child
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jmp_buf jmp; // where child will jump to
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void *stackaddr; // DeallocationStack or user-provided allocation address
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// of parent thread
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void *stacklimit; // StackLimit of parent thread
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void *stackbase; // StackBase of parent thread
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size_t guardsize; // size of POSIX guard region or (size_t) -1 if
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// user stack
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char filler[4];
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child_info_fork ();
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void __reg1 handle_fork ();
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bool abort (const char *fmt = NULL, ...);
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void alloc_stack ();
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};
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class fhandler_base;
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class cygheap_exec_info
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{
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public:
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int argc;
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char **argv;
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int envc;
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char **envp;
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HANDLE myself_pinfo;
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int nchildren;
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cchildren children[0];
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static cygheap_exec_info *alloc ();
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void record_children ();
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void reattach_children (HANDLE);
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};
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class child_info_spawn: public child_info
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{
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HANDLE hExeced;
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HANDLE ev;
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HANDLE sem;
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pid_t cygpid;
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public:
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cygheap_exec_info *moreinfo;
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int __stdin;
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int __stdout;
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char filler[4];
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void cleanup ();
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child_info_spawn () {};
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child_info_spawn (child_info_types, bool);
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void record_children ();
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void reattach_children ();
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void *operator new (size_t, void *p) __attribute__ ((nothrow)) {return p;}
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void set (child_info_types ci, bool b) { new (this) child_info_spawn (ci, b);}
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void __reg1 handle_spawn ();
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void set_sem (HANDLE _sem)
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{
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/* Don't leak semaphore handle into exec'ed process. */
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SetHandleInformation (sem = _sem, HANDLE_FLAG_INHERIT, 0);
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}
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bool set_saw_ctrl_c ()
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{
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if (!has_execed ())
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return false;
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flag |= _CI_SAW_CTRL_C;
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return true;
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}
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bool signal_myself_exited ()
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{
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if (!ev)
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return false;
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else
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{
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SetEvent (ev);
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return true;
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}
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}
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void wait_for_myself ();
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bool has_execed () const
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{
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if (hExeced)
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return true;
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if (type != _CH_EXEC)
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return false;
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return !!hExeced;
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}
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bool get_parent_handle ();
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bool has_execed_cygwin () const { return iscygwin () && has_execed (); }
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operator HANDLE& () {return hExeced;}
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int __reg3 worker (const char *, const char *const *, const char *const [],
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int, int = -1, int = -1);
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};
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extern child_info_spawn ch_spawn;
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#define have_execed ch_spawn.has_execed ()
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#define have_execed_cygwin ch_spawn.has_execed_cygwin ()
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void __stdcall init_child_info (DWORD, child_info *, HANDLE);
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extern "C" {
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extern child_info *child_proc_info;
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extern child_info_spawn *spawn_info asm (_SYMSTR (child_proc_info));
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extern child_info_fork *fork_info asm (_SYMSTR (child_proc_info));
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}
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