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Implement pthread_atfork()

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If threads are being used, then fork() will now acquire and release and
runtime locks so that fork() may be safely used from threads. This also
makes vfork() thread safe, because pthread mutexes will do nothing when
the process is a child of vfork(). More torture tests have been written
to confirm this all works like a charm. Additionally:

- Invent hexpcpy() api
- Rename nsync_malloc_() to kmalloc()
- Complete posix named semaphore implementation
- Make pthread_create() asynchronous signal safe
- Add rm, rmdir, and touch to command interpreter builtins
- Invent sigisprecious() and modify sigset functions to use it
- Add unit tests for posix_spawn() attributes and fix its bugs

One unresolved problem is the reclaiming of *NSYNC waiter memory in the
forked child processes, within apps which have threads waiting on locks
This commit is contained in:
Justine Tunney 2022-10-16 12:05:08 -07:00
parent 64c284003d
commit 60cb435cb4
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124 changed files with 2169 additions and 718 deletions
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68
libc/sysv/consts/ex.h
View file

@ -1,48 +1,32 @@
#ifndef COSMOPOLITAN_LIBC_SYSV_CONSTS_EX_H_
#define COSMOPOLITAN_LIBC_SYSV_CONSTS_EX_H_
#include "libc/runtime/symbolic.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
extern const int EX_CANTCREAT;
extern const int EX_CONFIG;
extern const int EX_DATAERR;
extern const int EX_IOERR;
extern const int EX_NOHOST;
extern const int EX_NOINPUT;
extern const int EX_NOPERM;
extern const int EX_NOUSER;
extern const int EX_OK;
extern const int EX_OSERR;
extern const int EX_OSFILE;
extern const int EX_PROTOCOL;
extern const int EX_SOFTWARE;
extern const int EX_TEMPFAIL;
extern const int EX_UNAVAILABLE;
extern const int EX_USAGE;
extern const int EX__BASE;
extern const int EX__MAX;
/**
* @fileoverview Eric Allman's exit() codes
*
* - Broadly supported style guideline;
* - Dating back to 1980 in 4.0BSD;
* - That won't be standardized.
*
*/
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#define EX_CANTCREAT LITERALLY(73)
#define EX_CONFIG LITERALLY(78)
#define EX_DATAERR LITERALLY(65)
#define EX_IOERR LITERALLY(74)
#define EX_NOHOST LITERALLY(68)
#define EX_NOINPUT LITERALLY(66)
#define EX_NOPERM LITERALLY(77)
#define EX_NOUSER LITERALLY(67)
#define EX_OK LITERALLY(0)
#define EX_OSERR LITERALLY(71)
#define EX_OSFILE LITERALLY(72)
#define EX_PROTOCOL LITERALLY(76)
#define EX_SOFTWARE LITERALLY(70)
#define EX_TEMPFAIL LITERALLY(75)
#define EX_UNAVAILABLE LITERALLY(69)
#define EX_USAGE LITERALLY(64)
#define EX__BASE LITERALLY(64)
#define EX__MAX LITERALLY(78)
#define EX_CANTCREAT 73
#define EX_CONFIG 78
#define EX_DATAERR 65
#define EX_IOERR 74
#define EX_NOHOST 68
#define EX_NOINPUT 66
#define EX_NOPERM 77
#define EX_NOUSER 67
#define EX_OK 0
#define EX_OSERR 71
#define EX_OSFILE 72
#define EX_PROTOCOL 76
#define EX_SOFTWARE 70
#define EX_TEMPFAIL 75
#define EX_UNAVAILABLE 69
#define EX_USAGE 64
#define EX__BASE 64
#define EX__MAX 78
#endif /* COSMOPOLITAN_LIBC_SYSV_CONSTS_EX_H_ */