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Copyright 1991 David Jurgens |
int open( const char *path, int access [, unsigned permis] )
- prototype in io.h, also include stat.h & fcntl.h
- open attribute flags are defined in fcntl.h
- opens file "path" with access and optionally permis
- access is a combination of the following ("permis" follows):
Read/Write Access Flags (mutually exclusive):
O_RDONLY open read only
O_WRONLY open write only
O_RDWR open read/write
Other Access Mode Flags:
O_APPEND file pointer is placed at EOF before each write
O_CREAT if file doesn't exist, create with "permis" attributes
O_TRUNC if exists, truncate length to zero, but leave file
attributes unchanged
O_BINARY binary mode
O_TEXT text mode
O_EXCL used with O_CREAT, error occurs if file already exists
O_NDELAY UNIX only
Permission Attributes (if creating):
S_IWRITE write permission
S_IREAD read permission
S_IREAD | S_IWRITE read/write permission
- if O_BINARY nor O_TEXT is given, file is opened in translation
mode (O_TEXT) given by global variable _fmode
- returns nonnegative number as file HANDLE, or -1 on error
- see sopen()
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