89 lines
1.8 KiB
C
89 lines
1.8 KiB
C
/*
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FUNCTION
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<<tmpfile>>---create a temporary file
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INDEX
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tmpfile
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INDEX
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_tmpfile_r
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SYNOPSIS
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#include <stdio.h>
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FILE *tmpfile(void);
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FILE *_tmpfile_r(struct _reent *<[reent]>);
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DESCRIPTION
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Create a temporary file (a file which will be deleted automatically),
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using a name generated by <<tmpnam>>. The temporary file is opened with
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the mode <<"wb+">>, permitting you to read and write anywhere in it
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as a binary file (without any data transformations the host system may
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perform for text files).
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The alternate function <<_tmpfile_r>> is a reentrant version. The
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argument <[reent]> is a pointer to a reentrancy structure.
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RETURNS
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<<tmpfile>> normally returns a pointer to the temporary file. If no
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temporary file could be created, the result is NULL, and <<errno>>
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records the reason for failure.
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PORTABILITY
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Both ANSI C and the System V Interface Definition (Issue 2) require
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<<tmpfile>>.
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Supporting OS subroutines required: <<close>>, <<fstat>>, <<getpid>>,
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<<isatty>>, <<lseek>>, <<open>>, <<read>>, <<sbrk>>, <<write>>.
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<<tmpfile>> also requires the global pointer <<environ>>.
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*/
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#include <_ansi.h>
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#include <reent.h>
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#include <stdio.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#ifndef O_BINARY
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# define O_BINARY 0
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#endif
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FILE *
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_tmpfile_r (struct _reent *ptr)
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{
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FILE *fp;
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int e;
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char *f;
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char buf[L_tmpnam];
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int fd;
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do
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{
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if ((f = _tmpnam_r (ptr, buf)) == NULL)
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return NULL;
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fd = _open_r (ptr, f, O_RDWR | O_CREAT | O_EXCL | O_BINARY,
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S_IRUSR | S_IWUSR);
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}
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while (fd < 0 && ptr->_errno == EEXIST);
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if (fd < 0)
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return NULL;
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fp = _fdopen_r (ptr, fd, "wb+");
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e = ptr->_errno;
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if (!fp)
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_close_r (ptr, fd);
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(void) _remove_r (ptr, f);
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ptr->_errno = e;
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return fp;
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}
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#ifndef _REENT_ONLY
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FILE *
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tmpfile (void)
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{
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return _tmpfile_r (_REENT);
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}
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#endif
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