4212522
Beschreibung
Quiz von Jon Schipp, aktualisiert more than 1 year ago
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Erstellt von Jon Schipp
vor fast 9 Jahre
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Frage 1
Frage
The three standard file descriptor's are opened on the program's behalf by the [blank_start]______[blank_end]
Antworten
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shell
Frage 2
Frage
The O_CREAT flag to open(2) can be used in conjunction with [blank_start]______[blank_end] flag to create a file exclusively (atomically).
Antworten
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O_EXCL
Frage 3
Frage
The [blank_start]_____[blank_end] flag to open(2) prevents dereferencing symbolic links and its absence is the cause of some vulnerabilities in privileged programs.
Antworten
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O_NOFOLLOW
Frage 4
Frage
When file descriptors are open in a program and a fork(2) and exec(2) happen before closing them - the descriptors can end up being passed to a new program. The [blank_start]_____[blank_end] flag to open(2) closes them for you.
Antworten
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O_CLOEXEC
Frage 5
Frage
The [blank_start]____[blank_end] is a directory in the proc filesystem which contains information about each file descriptor opened by a program.
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fdinfo
Frage 6
Frage
The two size types in the function prototype translate to what standard C types (in order of appearance)?
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signed integer type, unsigned integer type
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unsigned integer type, signed integer type
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integer type, signed integer type
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signed integer type, integer type
Frage 7
Frage
Which of the following flags to open(2) are not a part of the Single UNIX Specification?
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O_DIRECT
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O_LARGEFILE
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O_NOATIME
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O_ASYNC
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O_DSYNC
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O_SYNC
Frage 8
Frage
The creat(2) system call is equivalent to this open(2) system call
Antworten
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fd = open(pathname, O_WRONLY | O_CREAT | O_TRUNC, mode);
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fd = open(pathname, O_WRONLY | O_TRUNC, mode);
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fd = open(pathname, O_WRONLY | O_CREAT |O_APPEND, mode);
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fd = open(pathname, O_WRONLY | O_APPENDT | O_TRUNC, mode);
Frage 9
Frage
During which system calls does the kernel set the file offset or file pointer?
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read()
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write()
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lseek()
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open()
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close()
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creat()
Frage 10
Frage
During which system calls does the kernel update a pointer called the file offset or file pointer.
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read()
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write()
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close()
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creat()
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lseek()
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open()
Frage 11
Frage
With file holes the file system doesn’t allocate any disk blocks for a hole until, at some later point, data is written into it
Antworten
- True
- False
Frage 12
Frage
The return value from a successful lseek() is a?
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file offset
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number of seeked bytes
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number of read bytes
Frage 13
Frage
Writing to a file hole performs what action?
Antworten
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Allocating disk blocks but not writing null bytes in them
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Writing null bytes but not allocating disk blocks
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Allocating disk blocks and writing null byes within the blocks
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Neither, system assumes null byte are there
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