| 1 | /* |
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| 2 | FUNCTION |
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| 3 | <<tmpfile64>>---create a large temporary file |
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| 4 | |
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| 5 | INDEX |
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| 6 | tmpfile64 |
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| 7 | INDEX |
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| 8 | _tmpfile64_r |
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| 9 | |
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| 10 | SYNOPSIS |
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| 11 | #include <stdio.h> |
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| 12 | FILE *tmpfile64(void); |
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| 13 | |
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| 14 | FILE *_tmpfile64_r(void *<[reent]>); |
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| 15 | |
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| 16 | DESCRIPTION |
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| 17 | Create a large temporary file (a file which will be deleted automatically), |
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| 18 | using a name generated by <<tmpnam>>. The temporary file is opened with |
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| 19 | the mode <<"wb+">>, permitting you to read and write anywhere in it |
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| 20 | as a binary file (without any data transformations the host system may |
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| 21 | perform for text files). The file may be larger than 2GB. |
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| 22 | |
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| 23 | The alternate function <<_tmpfile64_r>> is a reentrant version. The |
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| 24 | argument <[reent]> is a pointer to a reentrancy structure. |
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| 25 | |
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| 26 | Both <<tmpfile64>> and <<_tmpfile64_r>> are only defined if __LARGE64_FILES |
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| 27 | is defined. |
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| 28 | |
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| 29 | RETURNS |
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| 30 | <<tmpfile64>> normally returns a pointer to the temporary file. If no |
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| 31 | temporary file could be created, the result is NULL, and <<errno>> |
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| 32 | records the reason for failure. |
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| 33 | |
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| 34 | PORTABILITY |
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| 35 | <<tmpfile64>> is a glibc extension. |
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| 36 | |
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| 37 | Supporting OS subroutines required: <<close>>, <<fstat>>, <<getpid>>, |
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| 38 | <<isatty>>, <<lseek64>>, <<open64>>, <<read>>, <<sbrk>>, <<write>>. |
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| 39 | |
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| 40 | <<tmpfile64>> also requires the global pointer <<environ>>. |
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| 41 | */ |
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| 42 | |
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| 43 | #include <stdio.h> |
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| 44 | #include <reent.h> |
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| 45 | #include <errno.h> |
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| 46 | #include <fcntl.h> |
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| 47 | #include <sys/stat.h> |
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| 48 | |
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| 49 | #ifndef O_BINARY |
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| 50 | # define O_BINARY 0 |
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| 51 | #endif |
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| 52 | |
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| 53 | #ifdef __LARGE64_FILES |
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| 54 | |
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| 55 | FILE * |
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| 56 | _tmpfile64_r (struct _reent *ptr) |
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| 57 | { |
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| 58 | FILE *fp; |
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| 59 | int e; |
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| 60 | char *f; |
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| 61 | char buf[L_tmpnam]; |
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| 62 | int fd; |
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| 63 | |
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| 64 | do |
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| 65 | { |
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| 66 | if ((f = _tmpnam_r (ptr, buf)) == NULL) |
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| 67 | return NULL; |
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| 68 | fd = _open64_r (ptr, f, O_RDWR | O_CREAT | O_EXCL | O_BINARY, |
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| 69 | S_IRUSR | S_IWUSR); |
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| 70 | } |
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| 71 | while (fd < 0 && ptr->_errno == EEXIST); |
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| 72 | if (fd < 0) |
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| 73 | return NULL; |
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| 74 | fp = _fdopen64_r (ptr, fd, "wb+"); |
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| 75 | e = ptr->_errno; |
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| 76 | if (!fp) |
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| 77 | _close_r (ptr, fd); |
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| 78 | (void) _remove_r (ptr, f); |
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| 79 | ptr->_errno = e; |
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| 80 | return fp; |
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| 81 | } |
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| 82 | |
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| 83 | #ifndef _REENT_ONLY |
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| 84 | |
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| 85 | FILE * |
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| 86 | tmpfile64 (void) |
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| 87 | { |
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| 88 | return _tmpfile64_r (_REENT); |
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| 89 | } |
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| 90 | |
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| 91 | #endif |
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| 92 | |
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| 93 | #endif /* __LARGE64_FILES */ |
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