Name: creat()
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System call or function: System call |
Links: Online Manual | Course Packet |
What it does: Creates a new file and opens it for writing. If a file with the same name already exists, empty (truncate) it before opening it. Same as calling open()
with the 3 flags: O_WRONLY | O_CREAT | O_TRUNC
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What libraries you must include: #include <sys/stat.h> // Defines modes such as S_IRUSR
#include <fcntl.h> // Defines creat()
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Syntax: int creat (const char *name, mode_t mode);
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Description of arguments: name
: double-quoted name of the file
mode
: Sets default file permissions, e.g.,: S_IRWXU (owner: read, write, and execute), S_IRUSR (owner: read), S_IRGRP (group: read), S_IROTH (others: read), etc.
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What type it returns: int
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On success: A legit file descriptor (a non-negative integer) |
On failure: -1
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If failure, does it set errno
? Yes |
Quick example: int file_fd = creat ("text.txt", S_IWUSR | S_IRUSR | S_IXUSR);
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Other variations: open()
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These notes by Miriam Briskman are licensed under CC BY-NC 4.0 and based on sources.