|FCHOWN(3P)||POSIX Programmer's Manual||FCHOWN(3P)|
int fchown(int fildes, uid_t owner, gid_t group);
- The fildes argument is not an open file descriptor.
- The effective user ID does not match the owner of the file or the process does not have appropriate privileges and _POSIX_CHOWN_RESTRICTED indicates that such privilege is required.
- The file referred to by fildes resides on a read-only file system.
The fchown() function may fail if:
- The owner or group ID is not a value supported by the implementation. The fildes argument refers to a pipe or socket or an fattach()-ed STREAM and the implementation disallows execution of fchown() on a pipe.
- A physical I/O error has occurred.
- The fchown() function was interrupted by a signal which was caught.
The following sections are informative.
The numeric value for the user ID is obtained by extracting the user ID from the user database entry associated with ``jones''. Similarly, the numeric value for the group ID is obtained by extracting the group ID from the group database entry associated with ``cnd''. This example assumes the calling program has appropriate privileges.
#include <sys/types.h> #include <unistd.h> #include <fcntl.h> #include <pwd.h> #include <grp.h>
struct passwd *pwd; struct group *grp; int fildes; ... fildes = open("/home/cnd/mod1", O_RDWR); pwd = getpwnam("jones"); grp = getgrnam("cnd"); fchown(fildes, pwd->pw_uid, grp->gr_gid);
The Base Definitions volume of POSIX.1‐2017, <unistd.h>
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|2017||IEEE/The Open Group|