diff options
Diffstat (limited to 'mdk-stage1/dietlibc/lib/lockf.c')
-rw-r--r-- | mdk-stage1/dietlibc/lib/lockf.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/mdk-stage1/dietlibc/lib/lockf.c b/mdk-stage1/dietlibc/lib/lockf.c new file mode 100644 index 000000000..2b1d004ef --- /dev/null +++ b/mdk-stage1/dietlibc/lib/lockf.c @@ -0,0 +1,37 @@ +#include <sys/types.h> +#include <fcntl.h> +#include <unistd.h> +#include <errno.h> + +int lockf(int fd, int cmd, off_t len) { + struct flock fl; + fl.l_whence=SEEK_CUR; + fl.l_start=0; + fl.l_len=len; + fl.l_pid=0; + switch (cmd) { + case F_TEST: + if (fcntl(fd,F_GETLK,&fl)<0) + return -1; + if (fl.l_type == F_UNLCK || fl.l_pid == getpid ()) + return 0; + errno=EACCES; + return -1; + case F_ULOCK: + fl.l_type=F_UNLCK; + cmd=F_SETLK; + break; + case F_LOCK: + fl.l_type = F_WRLCK; + cmd = F_SETLKW; + break; + case F_TLOCK: + fl.l_type = F_WRLCK; + cmd = F_SETLK; + break; + default: + errno=EINVAL; + return -1; + } + return fcntl(fd,cmd,&fl); +} |