1EUIDACCESS(3)              Linux Programmer's Manual             EUIDACCESS(3)
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NAME

6       euidaccess, eaccess - check effective user's permissions for a file
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SYNOPSIS

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

16       Like  access(2),  euidaccess()  checks permissions and existence of the
17       file identified by its argument pathname.  However, whereas  access(2),
18       performs  checks  using  the  real  user  and  group identifiers of the
19       process, euidaccess() uses the effective identifiers.
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21       mode is a mask consisting of one or more of R_OK, W_OK, X_OK and  F_OK,
22       with the same meanings as for access(2).
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24       eaccess()  is  a  synonym  for euidaccess(), provided for compatibility
25       with some other systems.
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RETURN VALUE

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

34       As for access(2).
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VERSIONS

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

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

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

55       access(2),  chmod(2),  chown(2),  faccessat(2),   open(2),   setgid(2),
56       setuid(2), stat(2), credentials(7), path_resolution(7)
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COLOPHON

59       This  page  is  part of release 3.53 of the Linux man-pages project.  A
60       description of the project, and information about reporting  bugs,  can
61       be found at http://www.kernel.org/doc/man-pages/.
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65                                  2010-11-01                     EUIDACCESS(3)
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