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    Command:

    euidaccess

    
    
    

    SYNOPSIS

           #define _GNU_SOURCE             /* See feature_test_macros(7) */
           #include <unistd.h>
    
           int euidaccess(const char *pathname, int mode);
           int eaccess(const char *pathname, int mode);
    
    
    

    DESCRIPTION

           Like  access(2),  euidaccess()  checks permissions and existence of the
           file identified by its argument pathname.  However, whereas  access(2),
           performs  checks  using the real user and group identifiers of the pro-
           cess, euidaccess() uses the effective identifiers.
    
           mode is a mask consisting of one or more of R_OK, W_OK, X_OK, and F_OK,
           with the same meanings as for access(2).
    
           eaccess()  is  a  synonym  for euidaccess(), provided for compatibility
           with some other systems.
    
    
    

    RETURN VALUE

           On success (all requested permissions granted), zero is  returned.   On
           error  (at least one bit in mode asked for a permission that is denied,
           or some other error occurred), -1 is returned, and errno is set  appro-
           priately.
    
    
    

    ERRORS

           As for access(2).
    
    
    

    VERSIONS

           The eaccess() function was added to glibc in version 2.4.
    
    
    

    ATTRIBUTES

       Multithreading (see pthreads(7))
           The euidaccess() and eaccess() functions are thread-safe.
    
    
    

    CONFORMING TO

           These  functions are nonstandard.  Some other systems have an eaccess()
           function.
    
    
    

    NOTES

           Warning: Using this function to check a process's permissions on a file
           before  performing  some  operation  based on that information leads to
           race conditions: the file permissions may change between the two steps.
           Generally, it is safer just to attempt the desired operation and handle
           any permission error that occurs.
    
           This function always dereferences symbolic links.  If you need to check
           the  permissions  on  a  symbolic link, use faccessat(2) with the flags
           AT_EACCESS and AT_SYMLINK_NOFOLLOW.
    
    
    

    SEE ALSO

           access(2),  chmod(2),  chown(2),  faccessat(2),   open(2),   setgid(2),
    
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