Change the user ID and group ID of a file
#include <sys/types.h> #include <unistd.h> int fchown( int fd, uid_t owner, gid_t group );
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The fchown() function changes the user ID and group ID of the file referenced by fd to be the numeric values contained in owner and group, respectively. It's similar to chown(), but you use a file descriptor instead of a path to identify the file.
/* * Change the ownership of a list of files * to the current user/group */ #include <stdio.h> #include <fcntl.h> #include <sys/types.h> #include <unistd.h> int main( int argc, char **argv ) { int i; int ecode = 0; int fd; for( i = 1; i < argc; i++ ) { if( ( fd = open( argv[i], O_RDONLY ) ) == -1 ) { perror( argv[i] ); ecode++; } else if( fchown( fd, getuid(), getgid() ) == -1 ) { perror( argv[i] ); ecode++; } close( fd ); } return ecode; }
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | Yes |
Thread | Yes |