diff options
| author | Konstantin Belousov <kib@FreeBSD.org> | 2026-01-08 00:32:11 +0000 |
|---|---|---|
| committer | Konstantin Belousov <kib@FreeBSD.org> | 2026-01-25 15:53:09 +0000 |
| commit | 5c2ee618d5ec21f110c4da40e9f17833b2ab8b76 (patch) | |
| tree | 187b5c312550ff2a7afca79420fc4e9497ff7bcd | |
| parent | d0d4b9b9df2ade9085b6318e3fdbc9b67b3f666c (diff) | |
sys: add pdrfork(2)
Reviewed by: asomers, markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D54592
| -rw-r--r-- | sys/kern/kern_fork.c | 42 | ||||
| -rw-r--r-- | sys/kern/syscalls.master | 9 |
2 files changed, 51 insertions, 0 deletions
diff --git a/sys/kern/kern_fork.c b/sys/kern/kern_fork.c index 746aaf20ce03..6313bf3bb651 100644 --- a/sys/kern/kern_fork.c +++ b/sys/kern/kern_fork.c @@ -189,6 +189,48 @@ sys_rfork(struct thread *td, struct rfork_args *uap) return (error); } +int +sys_pdrfork(struct thread *td, struct pdrfork_args *uap) +{ + struct fork_req fr; + int error, fd, pid; + + bzero(&fr, sizeof(fr)); + fd = -1; + + AUDIT_ARG_FFLAGS(uap->pdflags); + AUDIT_ARG_CMD(uap->rfflags); + + if ((uap->rfflags & (RFSTOPPED | RFHIGHPID)) != 0) + return (EXTERROR(EINVAL, + "Kernel-only flags %#jx", uap->rfflags)); + + /* RFSPAWN must not appear with others */ + if ((uap->rfflags & RFSPAWN) != 0) { + if (uap->rfflags != RFSPAWN) + return (EXTERROR(EINVAL, + "RFSPAWN must be the only flag %#jx", + uap->rfflags)); + fr.fr_flags = RFFDG | RFPROC | RFPPWAIT | RFMEM | RFPROCDESC; + fr.fr_flags2 = FR2_DROPSIG_CAUGHT; + } else { + fr.fr_flags = uap->rfflags; + } + + fr.fr_pidp = &pid; + fr.fr_pd_fd = &fd; + fr.fr_pd_flags = uap->pdflags; + error = fork1(td, &fr); + if (error == 0) { + td->td_retval[0] = pid; + td->td_retval[1] = 0; + if ((fr.fr_flags & (RFPROC | RFPROCDESC)) == + (RFPROC | RFPROCDESC) || uap->rfflags == RFSPAWN) + error = copyout(&fd, uap->fdp, sizeof(fd)); + } + return (error); +} + int __exclusive_cache_line nprocs = 1; /* process 0 */ int lastpid = 0; SYSCTL_INT(_kern, OID_AUTO, lastpid, CTLFLAG_RD, &lastpid, 0, diff --git a/sys/kern/syscalls.master b/sys/kern/syscalls.master index ea6d2b5aa1ef..1d0608297913 100644 --- a/sys/kern/syscalls.master +++ b/sys/kern/syscalls.master @@ -3402,4 +3402,13 @@ u_long flags ); } + +600 AUE_PDRFORK STD|CAPENABLED { + int pdrfork( + _Out_ int *fdp, + int pdflags, + int rfflags + ); + } + ; vim: syntax=off |