Allow FIONBIO and FIOASYNC ioctls on POSIX shm descriptors.
They have no effect, as with filesystem file descriptors. This improves compatibility with some existing userspace code. Submitted by: Greg V <greg@unrelenting.technology> Reviewed by: kib MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D19330
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=344670
@ -60,6 +60,7 @@ __FBSDID("$FreeBSD$");
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#include <sys/fcntl.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/filio.h>
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#include <sys/fnv_hash.h>
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#include <sys/kernel.h>
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#include <sys/uio.h>
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@ -126,6 +127,7 @@ static int shm_remove(char *path, Fnv32_t fnv, struct ucred *ucred);
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static fo_rdwr_t shm_read;
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static fo_rdwr_t shm_write;
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static fo_truncate_t shm_truncate;
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static fo_ioctl_t shm_ioctl;
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static fo_stat_t shm_stat;
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static fo_close_t shm_close;
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static fo_chmod_t shm_chmod;
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@ -139,7 +141,7 @@ struct fileops shm_ops = {
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.fo_read = shm_read,
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.fo_write = shm_write,
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.fo_truncate = shm_truncate,
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.fo_ioctl = invfo_ioctl,
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.fo_ioctl = shm_ioctl,
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.fo_poll = invfo_poll,
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.fo_kqfilter = invfo_kqfilter,
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.fo_stat = shm_stat,
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@ -363,6 +365,24 @@ shm_truncate(struct file *fp, off_t length, struct ucred *active_cred,
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return (shm_dotruncate(shmfd, length));
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}
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int
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shm_ioctl(struct file *fp, u_long com, void *data, struct ucred *active_cred,
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struct thread *td)
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{
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switch (com) {
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case FIONBIO:
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case FIOASYNC:
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/*
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* Allow fcntl(fd, F_SETFL, O_NONBLOCK) to work,
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* just like it would on an unlinked regular file
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*/
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return (0);
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default:
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return (ENOTTY);
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}
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}
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static int
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shm_stat(struct file *fp, struct stat *sb, struct ucred *active_cred,
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struct thread *td)
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