mirror of
git://git.code.sf.net/p/cdesktopenv/code
synced 2025-03-09 15:50:02 +00:00
814b5c6890
These are minor fixes I've accumulated over time. The following
changes are somewhat notable:
- Added a missing entry for 'typeset -s' to the man page.
- Add strftime(3) to the 'see also' section. This and the date(1)
addition are meant to add onto the documentation for 'printf %T'.
- Removed the man page the entry for ksh reading $PWD/.profile on
login. That feature was removed in commit aa7713c2.
- Added date(1) to the 'see also' section of the man page.
- Note that the 'hash' command can be used instead of 'alias -t' to
workaround one of the caveats listed in the man page.
- Use an 'out of memory' error message rather than 'out of space'
when memory allocation fails.
- Replaced backticks with quotes in some places for consistency.
- Added missing documentation for the %P date format.
- Added missing documentation for the printf %Q and %p formats
(backported from ksh2020: https://github.com/att/ast/pull/1032).
- The comments that show each builtin's options have been updated.
441 lines
11 KiB
C
441 lines
11 KiB
C
/***********************************************************************
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* *
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* This software is part of the ast package *
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* Copyright (c) 1985-2012 AT&T Intellectual Property *
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* and is licensed under the *
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* Eclipse Public License, Version 1.0 *
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* by AT&T Intellectual Property *
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* *
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* A copy of the License is available at *
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* http://www.eclipse.org/org/documents/epl-v10.html *
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* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
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* *
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* Information and Software Systems Research *
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* AT&T Research *
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* Florham Park NJ *
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* *
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* Glenn Fowler <gsf@research.att.com> *
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* David Korn <dgk@research.att.com> *
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* Phong Vo <kpv@research.att.com> *
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* *
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***********************************************************************/
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#include "sfhdr.h"
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#if _PACKAGE_ast
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# if defined(__linux__) && _lib_statfs
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# include <sys/statfs.h>
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# ifndef TMPFS_MAGIC
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# define TMPFS_MAGIC 0x01021994
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# endif
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# endif
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#endif
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/* Create a temporary stream for read/write.
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** The stream is originally created as a memory-resident stream.
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** When this memory is exceeded, a real temp file will be created.
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** The temp file creation sequence is somewhat convoluted so that
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** pool/stack/discipline will work correctly.
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**
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** Written by David Korn and Kiem-Phong Vo.
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*/
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#if _tmp_rmfail
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/* File not removable while there is an open file descriptor.
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** To ensure that temp files are properly removed, we need:
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** 1. A discipline to remove a file when the corresponding stream is closed.
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** Care must be taken to close the file descriptor before removing the
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** file because systems such as NT do not allow file removal while
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** there is an open file handle.
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** 2. An atexit() function is set up to close temp files when process exits.
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** 3. On systems with O_TEMPORARY (e.g., NT), this is used to further ensure
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** that temp files will be removed after the last handle is closed.
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*/
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typedef struct _file_s File_t;
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struct _file_s
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{ File_t* next; /* link list */
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Sfio_t* f; /* associated stream */
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char name[1]; /* temp file name */
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};
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static File_t* File; /* list pf temp files */
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#if __STD_C
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static int _tmprmfile(Sfio_t* f, int type, Void_t* val, Sfdisc_t* disc)
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#else
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static int _tmprmfile(f, type, val, disc)
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Sfio_t* f;
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int type;
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Void_t* val;
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Sfdisc_t* disc;
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#endif
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{
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reg File_t *ff, *last;
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NOTUSED(val);
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if(type == SF_DPOP) /* don't allow this to pop */
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return -1;
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if(type == SF_CLOSING)
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{
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(void)vtmtxlock(_Sfmutex);
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for(last = NIL(File_t*), ff = File; ff; last = ff, ff = ff->next)
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if(ff->f == f)
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break;
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if(ff)
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{ if(!last)
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File = ff->next;
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else last->next = ff->next;
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if(_Sfnotify)
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(*_Sfnotify)(f,SF_CLOSING,f->file);
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CLOSE(f->file);
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f->file = -1;
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while(sysremovef(ff->name) < 0 && errno == EINTR)
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errno = 0;
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free((Void_t*)ff);
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}
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(void)vtmtxunlock(_Sfmutex);
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}
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return 0;
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}
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#if __STD_C
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static void _rmfiles(void)
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#else
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static void _rmfiles()
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#endif
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{ reg File_t *ff, *next;
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(void)vtmtxlock(_Sfmutex);
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for(ff = File; ff; ff = next)
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{ next = ff->next;
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_tmprmfile(ff->f, SF_CLOSING, NIL(Void_t*), ff->f->disc);
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}
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(void)vtmtxunlock(_Sfmutex);
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}
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static Sfdisc_t Rmdisc =
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{ NIL(Sfread_f), NIL(Sfwrite_f), NIL(Sfseek_f), _tmprmfile, NIL(Sfdisc_t*) };
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#endif /*_tmp_rmfail*/
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#if __STD_C
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static int _rmtmp(Sfio_t* f, char* file)
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#else
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static int _rmtmp(f, file)
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Sfio_t* f;
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char* file;
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#endif
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{
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#if _tmp_rmfail /* remove only when stream is closed */
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reg File_t* ff;
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if(!File)
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atexit(_rmfiles);
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if(!(ff = (File_t*)malloc(sizeof(File_t)+strlen(file))) )
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return -1;
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(void)vtmtxlock(_Sfmutex);
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ff->f = f;
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strcpy(ff->name,file);
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ff->next = File;
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File = ff;
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(void)vtmtxunlock(_Sfmutex);
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#else /* can remove now */
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while(sysremovef(file) < 0 && errno == EINTR)
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errno = 0;
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#endif
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return 0;
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}
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#if !_PACKAGE_ast
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#define TMPDFLT "/tmp"
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static char **Tmppath, **Tmpcur;
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#if __STD_C
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char** _sfgetpath(char* path)
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#else
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char** _sfgetpath(path)
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char* path;
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#endif
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{ reg char *p, **dirs;
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reg int n;
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if(!(path = getenv(path)) )
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return NIL(char**);
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for(p = path, n = 0;;) /* count number of directories */
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{ while(*p == ':')
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++p;
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if(*p == 0)
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break;
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n += 1;
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while(*p && *p != ':') /* skip dir name */
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++p;
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}
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if(n == 0 || !(dirs = (char**)malloc((n+1)*sizeof(char*))) )
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return NIL(char**);
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if(!(p = (char*)malloc(strlen(path)+1)) )
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{ free(dirs);
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return NIL(char**);
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}
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strcpy(p,path);
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for(n = 0;; ++n)
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{ while(*p == ':')
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++p;
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if(*p == 0)
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break;
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dirs[n] = p;
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while(*p && *p != ':')
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++p;
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if(*p == ':')
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*p++ = 0;
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}
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dirs[n] = NIL(char*);
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return dirs;
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}
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#endif /*!_PACKAGE_ast*/
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#if __STD_C
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static int _tmpfd(Sfio_t* f)
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#else
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static int _tmpfd(f)
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Sfio_t* f;
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#endif
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{
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reg char* file;
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int fd;
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#if _PACKAGE_ast
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# if defined(__linux__) && _lib_statfs
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/*
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* Use the area of POSIX shared memory objects for the new temporary file descriptor
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* that is do not access the HDD or SSD but only the memory based tmpfs of the POSIX SHM
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*/
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static int doshm;
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static char *shm = "/dev/shm";
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if (!doshm)
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{
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struct statfs fs;
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if (statfs(shm, &fs) < 0 || fs.f_type != TMPFS_MAGIC || eaccess(shm, W_OK|X_OK))
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shm = NiL;
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doshm++;
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}
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if(!(file = pathtemp(NiL,PATH_MAX,shm,"sf",&fd)))
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# else
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if(!(file = pathtemp(NiL,PATH_MAX,NiL,"sf",&fd)))
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# endif
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return -1;
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_rmtmp(f, file);
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free(file);
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#else
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int t;
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/* set up path of dirs to create temp files */
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if(!Tmppath && !(Tmppath = _sfgetpath("TMPPATH")) )
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{ if(!(Tmppath = (char**)malloc(2*sizeof(char*))) )
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return -1;
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if(!(file = getenv("TMPDIR")) )
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file = TMPDFLT;
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if(!(Tmppath[0] = (char*)malloc(strlen(file)+1)) )
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{ free(Tmppath);
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Tmppath = NIL(char**);
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return -1;
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}
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strcpy(Tmppath[0],file);
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Tmppath[1] = NIL(char*);
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}
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/* set current directory to create this temp file */
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if(Tmpcur)
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Tmpcur += 1;
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if(!Tmpcur || !Tmpcur[0])
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Tmpcur = Tmppath;
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fd = -1;
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for(t = 0; t < 10; ++t)
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{ /* compute a random name */
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static ulong Key, A;
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if(A == 0 || t > 0) /* get a quasi-random coefficient */
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{ reg int r;
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A = (ulong)time(NIL(time_t*)) ^ (((ulong)(&t)) >> 3);
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if(Key == 0)
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Key = (A >> 16) | ((A&0xffff)<<16);
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A ^= Key;
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if((r = (A-1) & 03) != 0) /* Knuth vol.2, page.16, Thm.A */
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A += 4-r;
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}
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Key = A*Key + 987654321;
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file = sfprints("%s/sf%3.3.32lu.%3.3.32lu",
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Tmpcur[0], (Key>>15)&0x7fff, Key&0x7fff);
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if(!file)
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return -1;
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#if _has_oflags
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if((fd = sysopenf(file,O_RDWR|O_CREAT|O_EXCL|O_TEMPORARY,SF_CREATMODE)) >= 0)
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break;
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#else
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if((fd = sysopenf(file,O_RDONLY)) >= 0)
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{ /* file already exists */
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CLOSE(fd);
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fd = -1;
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}
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else if((fd = syscreatf(file,SF_CREATMODE)) >= 0)
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{ /* reopen for read and write */
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CLOSE(fd);
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if((fd = sysopenf(file,O_RDWR)) >= 0)
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break;
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/* don't know what happened but must remove file */
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while(sysremovef(file) < 0 && errno == EINTR)
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errno = 0;
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}
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#endif /* _has_oflags */
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}
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if(fd >= 0)
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_rmtmp(f, file);
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#endif /* _PACKAGE_ast */
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return fd;
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}
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#if __STD_C
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static int _tmpexcept(Sfio_t* f, int type, Void_t* val, Sfdisc_t* disc)
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#else
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static int _tmpexcept(f,type,val,disc)
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Sfio_t* f;
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int type;
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Void_t* val;
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Sfdisc_t* disc;
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#endif
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{
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reg int fd, m;
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reg Sfio_t* sf;
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Sfio_t newf, savf;
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Sfnotify_f notify = _Sfnotify;
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NOTUSED(val);
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/* the discipline needs to change only under the following exceptions */
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if(type != SF_WRITE && type != SF_SEEK &&
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type != SF_DPUSH && type != SF_DPOP && type != SF_DBUFFER)
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return 0;
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/* try to create the temp file */
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SFCLEAR(&newf,NIL(Vtmutex_t*));
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newf.flags = SF_STATIC;
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newf.mode = SF_AVAIL;
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if((fd = _tmpfd(f)) < 0 )
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return -1;
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/* make sure that the notify function won't be called here since
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we are only interested in creating the file, not the stream */
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_Sfnotify = 0;
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sf = sfnew(&newf,NIL(Void_t*),(size_t)SF_UNBOUND,fd,SF_READ|SF_WRITE);
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_Sfnotify = notify;
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if(!sf)
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return -1;
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if(newf.mutex) /* don't need a mutex for this stream */
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{ (void)vtmtxclrlock(newf.mutex);
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(void)vtmtxclose(newf.mutex);
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newf.mutex = NIL(Vtmutex_t*);
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}
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/* make sure that new stream has the same mode */
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if((m = f->flags&(SF_READ|SF_WRITE)) != (SF_READ|SF_WRITE))
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sfset(sf, ((~m)&(SF_READ|SF_WRITE)), 0);
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sfset(sf, (f->mode&(SF_READ|SF_WRITE)), 1);
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/* now remake the old stream into the new image */
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memcpy((Void_t*)(&savf), (Void_t*)f, sizeof(Sfio_t));
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memcpy((Void_t*)f, (Void_t*)sf, sizeof(Sfio_t));
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f->push = savf.push;
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f->pool = savf.pool;
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f->rsrv = savf.rsrv;
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f->proc = savf.proc;
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f->mutex = savf.mutex;
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f->stdio = savf.stdio;
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/* remove the SF_STATIC bit if it was only set above in making newf */
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if(!(savf.flags&SF_STATIC) )
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f->flags &= ~SF_STATIC;
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if(savf.data)
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{ SFSTRSIZE(&savf);
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if(!(savf.flags&SF_MALLOC) )
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(void)sfsetbuf(f,(Void_t*)savf.data,savf.size);
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if(savf.extent > 0)
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(void)sfwrite(f,(Void_t*)savf.data,(size_t)savf.extent);
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(void)sfseek(f,(Sfoff_t)(savf.next - savf.data),SEEK_SET);
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if((savf.flags&SF_MALLOC) )
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free((Void_t*)savf.data);
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}
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/* announce change of status */
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f->disc = NIL(Sfdisc_t*);
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if(_Sfnotify)
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(*_Sfnotify)(f, SF_SETFD, (void*)((long)f->file));
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/* erase all traces of newf */
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newf.data = newf.endb = newf.endr = newf.endw = NIL(uchar*);
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newf.file = -1;
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_Sfnotify = 0;
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sfclose(&newf);
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_Sfnotify = notify;
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return 1;
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}
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#if __STD_C
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Sfio_t* sftmp(size_t s)
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#else
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Sfio_t* sftmp(s)
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size_t s;
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#endif
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{
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Sfio_t *f;
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int rv;
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Sfnotify_f notify = _Sfnotify;
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static Sfdisc_t Tmpdisc =
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{ NIL(Sfread_f), NIL(Sfwrite_f), NIL(Sfseek_f), _tmpexcept,
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#if _tmp_rmfail
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&Rmdisc
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#else
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NIL(Sfdisc_t*)
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#endif
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};
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/* start with a memory resident stream */
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_Sfnotify = 0; /* local computation so no notification */
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f = sfnew(NIL(Sfio_t*),NIL(char*),s,-1,SF_STRING|SF_READ|SF_WRITE);
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_Sfnotify = notify;
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if(!f)
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return NIL(Sfio_t*);
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if(s != (size_t)SF_UNBOUND) /* set up a discipline for out-of-bound, etc. */
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f->disc = &Tmpdisc;
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if(s == 0) /* make the file now */
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{ _Sfnotify = 0; /* local computation so no notification */
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rv = _tmpexcept(f,SF_DPOP,NIL(Void_t*),f->disc);
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_Sfnotify = notify;
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if(rv < 0)
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{ sfclose(f);
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return NIL(Sfio_t*);
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}
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}
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if(_Sfnotify)
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(*_Sfnotify)(f, SF_NEW, (void*)((long)f->file));
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return f;
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}
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