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/* ISC license. */
#include <errno.h>
#include <skalibs/bytestr.h>
#include <skalibs/diuint.h>
#include <skalibs/djbunix.h>
#include <s6-rc/s6rc-utils.h>
int s6rc_lock (char const *live, int lwhat, int *llfd, char const *compiled, int cwhat, int *ccfd)
{
int e = 0 ;
int lfd = -1, cfd = -1 ;
if (lwhat)
{
unsigned int llen = str_len(live) ;
char lfn[llen + 6] ;
byte_copy(lfn, llen, live) ;
byte_copy(lfn + llen, 6, "/lock") ;
lfd = open_create(lfn) ;
if (lfd < 0) return 0 ;
if ((lwhat > 1 ? lock_ex(lfd) : lock_sh(lfd)) < 0) { e = errno ; goto lerr ; }
}
if (cwhat)
{
unsigned int clen = str_len(compiled) ;
char cfn[clen + 6] ;
byte_copy(cfn, clen, compiled) ;
byte_copy(cfn + clen, 6, "/lock") ;
cfd = open_create(cfn) ;
if (cfd < 0)
if (cwhat > 1 || errno != EROFS) { e = errno ; goto lerr ; }
else cfd = -errno ;
else if ((cwhat > 1 ? lock_ex(cfd) : lock_sh(cfd)) < 0) { e = errno ; goto cerr ; }
}
if (lwhat) *llfd = lfd ;
if (cwhat) *ccfd = cfd ;
return 1 ;
cerr:
fd_close(cfd) ;
lerr:
if (lwhat) fd_close(lfd) ;
errno = e ;
return 0 ;
}
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