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/* ISC license. */
#include <errno.h>
#include <skalibs/strerr.h>
#include <skalibs/djbunix.h>
#include "s6lockd.h"
int s6lockd_openandlock (char const *file, int ex, int nb)
{
int fd, r ;
if (ex)
{
fd = open_create(file) ;
if (fd < 0) strerr_diefu3sys(111, "open ", file, " for writing") ;
}
else
{
fd = open_read(file) ;
if (fd < 0)
{
if (errno != ENOENT) strerr_diefu3sys(111, "open ", file, " for reading") ;
fd = open_create(file) ;
if (fd < 0) strerr_diefu2sys(111, "create ", file) ;
fd_close(fd) ;
fd = open_read(file) ;
if (fd < 0) strerr_diefu3sys(111, "open ", file, " for reading") ;
}
}
r = fd_lock(fd, ex, nb) ;
if (!r) errno = EBUSY ;
if (r < 1) strerr_diefu2sys(1, "lock ", file) ;
return fd ;
}
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