std::experimental::filesystem::is_symlink

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< cpp‎ | experimental‎ | fs
 
 
Technical specifications
Filesystem library (filesystem TS)
Library fundamentals (library fundamentals TS)
Library fundamentals 2 (library fundamentals 2 TS)
Extensions for parallelism (parallelism TS)
Concepts (concepts TS)
Extensions for concurrency (concurrency TS)
 
 
Defined in header <experimental/filesystem>
bool is_symlink( file_status s );
(1) (filesystem TS)
bool is_symlink( const path& p );
bool is_symlink( const path& p, error_code& ec );
(2) (filesystem TS)

Checks if the given file status or path corresponds to a symbolic link, as if determined by the POSIX S_IFLNK.

1) Equivalent to s.type() == file_type::symlink.
2) Equivalent to is_symlink(status(p)) or is_symlink(status(p, ec)).

Contents

[edit] Parameters

s - file status to check
p - path to examine
ec - out-parameter for error reporting in the non-throwing overload

[edit] Return value

true if the file indicated by p or if the type indicated s refers to a symbolic link. The non-throwing overload returns false if an error occurs.

[edit] Exceptions

1)
noexcept specification:  
noexcept
  
2,3) The overload that does not take a error_code& parameter throws filesystem_error on underlying OS API errors, constructed with p as the first argument and the OS error code as the error code argument. std::bad_alloc may be thrown if memory allocation fails. The overload taking a error_code& parameter sets it to the OS API error code if an OS API call fails, and executes ec.clear() if no errors occur. This overload has
noexcept specification:  
noexcept
  

[edit] Notes

The information provided by this function is usually also provided as a byproduct of directory iteration. During directory iteration, calling is_symlink(*iterator) is less efficient than is_symlink(iterator->status())

[edit] Example

#include <iostream>
#include <fstream>
#include <cstdio>
#include <cstring>
#include <experimental/filesystem>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/stat.h>
 
namespace fs = std::experimental::filesystem;
 
void demo_status(const fs::path& p, fs::file_status s)
{
    std::cout << p;
    // alternative: switch(s.type()) { case fs::file_type::regular: ...}
    if(fs::is_regular_file(s)) std::cout << " is a regular file\n";
    if(fs::is_directory(s)) std::cout << " is a directory\n";
    if(fs::is_block_file(s)) std::cout << " is a block device\n";
    if(fs::is_character_file(s)) std::cout << " is a character device\n";
    if(fs::is_fifo(s)) std::cout << " is a named IPC pipe\n";
    if(fs::is_socket(s)) std::cout << " is a named IPC socket\n";
    if(fs::is_symlink(s)) std::cout << " is a symlink\n";
    if(!fs::exists(s)) std::cout << " does not exist\n";
}
int main()
{
    // create files of different kinds
    fs::create_directory("sandbox");
    std::ofstream("sandbox/file"); // create regular file
    fs::create_directory("sandbox/dir");
    mkfifo("sandbox/pipe", 0644);
    struct sockaddr_un addr;
    addr.sun_family = AF_UNIX;
    std::strcpy(addr.sun_path, "sandbox/sock");
    int fd = socket(PF_UNIX, SOCK_STREAM, 0);
    bind(fd, (struct sockaddr*)&addr, sizeof addr);
    fs::create_symlink("file", "sandbox/symlink");
 
    // demo different status accessors
    for(auto it = fs::directory_iterator("sandbox"); it != fs::directory_iterator(); ++it)
        demo_status(*it, it->symlink_status()); // use cached status from directory entry
    demo_status("dev/null", fs::status("/dev/null")); // direct calls to status
    demo_status("dev/sda", fs::status("/dev/sda"));
    demo_status("sandbox/no", fs::status("/sandbox/no"));
 
    // cleanup
    close(fd);
    fs::remove_all("sandbox");
}

Possible output:

"sandbox/file" is a regular file
"sandbox/dir" is a directory
"sandbox/pipe" is a named IPC pipe
"sandbox/sock" is a named IPC socket
"sandbox/symlink" is a symlink
"dev/null" is a character device
"dev/sda" is a block device
"sandbox/no" does not exist

[edit] See also

determines file attributes
determines file attributes, checking the symlink target
(function)
represents file type and permissions
(class)
checks whether file status is known
(function)
checks whether the given path refers to block device
(function)
checks whether the given path refers to a character device
(function)
checks whether the given path refers to a directory
(function)
checks whether the given path refers to a named pipe
(function)
checks whether the argument refers to an other file
(function)
checks whether the argument refers to a regular file
(function)
checks whether the argument refers to a named IPC socket
(function)
checks whether path refers to existing file system object
(function)
cached status of the file designated by this directory entry
cached symlink_status of the file designated by this directory entry
(public member function of std::experimental::filesystem::directory_entry)