Is there an access function in linux?

There is an access function in Linux; this function is used to check the user's permissions on a file. If the specified access method is valid, the function returns 0, otherwise the function returns "-1", and the syntax is " int access(const char* pathname, int mode);".

#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

Is there an access function in linux?

Is there an access function in linux

access function header file: unistd.h Function: Determine the file or folder access rights. That is, check the access mode of a certain file, such as read-only mode, write-only mode, etc. If the specified access method is valid, the function returns 0, otherwise the function returns -1.

The syntax is:

#include<unistd.h>
int access(const char* pathname, int mode);

Parameter introduction:

pathname is the path name of the file file name

mode: specifies the role of access, take The values ​​are as follows

• F_OK value is 0, determine whether the file exists

• ##X_OK value is 1, determine whether the file has executable permission

• W_OK value is 2, determine whether the file has write permission

• R_OK value is 4, determine whether the file has read permission

Note: The last three can be used together with "|", such as W_OK|R_OK

For example:

access("test",06);
access("test",F_OK);

are used to check the actual user pair respectively. Whether the test file has read and write permissions and whether the test file exists.

Recommended learning:

Linux video tutorial

The above is the detailed content of Is there an access function in linux?. For more information, please follow other related articles on the PHP Chinese website!