OPEN_APPEND(3) - man page online | library functions

Open a file for appending.

open_append(3)                       Library Functions Manual                      open_append(3)

NAME open_append - open a file for appending
SYNTAX #include <open.h> int open_append(const char *filename);
DESCRIPTION open_append opens the file filename for appending write-only use and returns the file han‐ dle. If it does not exist, it will be created with mode 0600. If there was an error opening or creating the file, open_append returns -1 and sets errno accordingly. All write operations will append after the last byte, regardless of previous calls to lseek(2) or other processes also appending to the same file.
SEE ALSO open(2)
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open_append(3) referred by
refer to lseek(2) | open(2)