mirror of
https://github.com/lcn2/calc.git
synced 2025-08-16 01:03:29 +03:00
50 lines
1.2 KiB
Plaintext
50 lines
1.2 KiB
Plaintext
NAME
|
|
access - determine existence or accessibility of named file
|
|
|
|
SYNOPSIS
|
|
access(name [, mode])
|
|
|
|
TYPES
|
|
name string
|
|
mode integer or string containing only 'r', 'w', 'x' characters
|
|
|
|
return null value or error
|
|
|
|
DESCRIPTION
|
|
access(name) or access(name, 0) or access(name, "") returns the null
|
|
value if a file with this name exists.
|
|
|
|
If non-null mode is specified, the null value is returned if there
|
|
is a file with the specified name and accessibility indicated by the
|
|
bits or characters of the mode argument: 'r' or bit 2 for reading,
|
|
'w' or bit 1 for writing, 'x' or bit 0 for execution.
|
|
|
|
EXAMPLE
|
|
The system error-numbers and messages may differ for different
|
|
implementations
|
|
|
|
> !rm -f junk
|
|
> access("junk")
|
|
System error 2
|
|
> strerror(.)
|
|
"No such file or directory"
|
|
> f = fopen("junk", "w")
|
|
> access("junk")
|
|
> fputs(f, "Alpha")
|
|
> fclose(f)
|
|
> !chmod u-w junk
|
|
> access("junk", "w")
|
|
System error 13
|
|
> strerror(.)
|
|
"Permission denied"
|
|
|
|
LIMITS
|
|
There may be implementation-dependent limits inherited from the
|
|
system call "access" used by this function.
|
|
|
|
LIBRARY
|
|
none
|
|
|
|
SEE ALSO
|
|
fopen, fclose, isfile, files
|