How can I check if a directory exists

Question

How can I check if a directory exists on Linux in C

User · Answer

According to man 2 stat you can use the S ISDIR macro on the st mode field   bool isdir   S ISDIR st st mode     Side note  I would recommend using Boost and or Qt4 to make cross-platform support easier      if your software can be viable on other OSs

User · Answer

Use the following code to check if a folder exists  It works on both Windows  amp  Linux platforms    include  lt stdio h gt   include  lt sys stat h gt   int main int argc  char  argv          const char  folder        folder    C   Users  SaMaN  Desktop  Ppln       folder     tmp       struct stat sb       if  stat folder   amp sb     0  amp  amp  S ISDIR sb st mode             printf  YES n          else           printf  NO n

User · Answer

You might use stat   and pass it the address of a struct stat  then check its member st mode for having S IFDIR set    include  lt stdio h gt   include  lt sys types h gt   include  lt sys stat h gt   include  lt unistd h gt        char d      mydir    struct stat s    0    if   stat d   amp s     printf    s  is  sa directory  n   d   s st mode  amp  S IFDIR           not           s st mode  amp  S IFDIR  can be replaced with S ISDIR s st mode  else   perror  stat

User · Answer

The best way is probably trying to open it  using just opendir   for instance   Note that it s always best to try to use a filesystem resource  and handling any errors occuring because it doesn t exist  rather than just checking and then later trying  There is an obvious race condition in the latter approach

User · Answer

You may also use access in combination with opendir to determine if the directory exists  and  if the name exists  but is not a directory  For example     test that dir exists  1 success  -1 does not exist  -2 not dir     int xis dir  const char  d        DIR  dirptr       if  access   d  F OK      -1                file exists         if   dirptr   opendir  d      NULL                closedir  dirptr      d exists and is a directory              else               return -2     d exists but is not a directory                    else           return -1         d does not exist               return 1

User · Answer

You can use opendir   and check if ENOENT    errno on failure    include  lt dirent h gt   include  lt errno h gt   DIR  dir   opendir  mydir    if  dir           Directory exists         closedir dir     else if  ENOENT    errno           Directory does not exist       else          opendir   failed for some other reason

[c] How can I check if a directory exists?

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