mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 23:13:34 +00:00
291 lines
9.6 KiB
C
291 lines
9.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2021 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/assert.h"
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/calls/struct/sigset.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/errno.h"
|
|
#include "libc/macros.internal.h"
|
|
#include "libc/mem/mem.h"
|
|
#include "libc/stdio/posix_spawn.h"
|
|
#include "libc/stdio/posix_spawn.internal.h"
|
|
#include "libc/sysv/consts/sig.h"
|
|
|
|
/**
|
|
* Initialize posix_spawn() attributes object with default values.
|
|
*
|
|
* @param attr needs to be passed to posix_spawnattr_destroy() later
|
|
* @return 0 on success, or errno on error
|
|
* @raise ENOMEM if we require more vespene gas
|
|
*/
|
|
int posix_spawnattr_init(posix_spawnattr_t *attr) {
|
|
int rc, e = errno;
|
|
struct _posix_spawna *a;
|
|
if ((a = calloc(1, sizeof(struct _posix_spawna)))) {
|
|
*attr = a;
|
|
rc = 0;
|
|
} else {
|
|
rc = errno;
|
|
errno = e;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* Destroys posix_spawn() attributes object.
|
|
*
|
|
* This function is safe to call multiple times.
|
|
*
|
|
* @param attr was initialized by posix_spawnattr_init()
|
|
* @return 0 on success, or errno on error
|
|
*/
|
|
int posix_spawnattr_destroy(posix_spawnattr_t *attr) {
|
|
if (*attr) {
|
|
free(*attr);
|
|
*attr = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Gets posix_spawn() flags.
|
|
*
|
|
* @param attr was initialized by posix_spawnattr_init()
|
|
* @return 0 on success, or errno on error
|
|
*/
|
|
int posix_spawnattr_getflags(const posix_spawnattr_t *attr, short *flags) {
|
|
*flags = (*attr)->flags;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Sets posix_spawn() flags.
|
|
*
|
|
* @param attr was initialized by posix_spawnattr_init()
|
|
* @param flags may have any of the following
|
|
* - `POSIX_SPAWN_RESETIDS`
|
|
* - `POSIX_SPAWN_SETPGROUP`
|
|
* - `POSIX_SPAWN_SETSIGDEF`
|
|
* - `POSIX_SPAWN_SETSIGMASK`
|
|
* - `POSIX_SPAWN_SETSCHEDPARAM`
|
|
* - `POSIX_SPAWN_SETSCHEDULER`
|
|
* - `POSIX_SPAWN_SETSID`
|
|
* @return 0 on success, or errno on error
|
|
* @raise EINVAL if `flags` has invalid bits
|
|
*/
|
|
int posix_spawnattr_setflags(posix_spawnattr_t *attr, short flags) {
|
|
if (flags &
|
|
~(POSIX_SPAWN_RESETIDS | POSIX_SPAWN_SETPGROUP | POSIX_SPAWN_SETSIGDEF |
|
|
POSIX_SPAWN_SETSIGMASK | POSIX_SPAWN_SETSCHEDPARAM |
|
|
POSIX_SPAWN_SETSCHEDULER | POSIX_SPAWN_SETSID)) {
|
|
return EINVAL;
|
|
}
|
|
(*attr)->flags = flags;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Gets process group id associated with attributes.
|
|
*
|
|
* @param attr was initialized by posix_spawnattr_init()
|
|
* @param pgroup receives the result on success
|
|
* @return 0 on success, or errno on error
|
|
*/
|
|
int posix_spawnattr_getpgroup(const posix_spawnattr_t *attr, int *pgroup) {
|
|
*pgroup = (*attr)->pgroup;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Specifies process group into which child process is placed.
|
|
*
|
|
* Setting `pgroup` to zero will ensure newly created processes are
|
|
* placed within their own brand new process group.
|
|
*
|
|
* This setter also sets the `POSIX_SPAWN_SETPGROUP` flag.
|
|
*
|
|
* @param attr was initialized by posix_spawnattr_init()
|
|
* @param pgroup is the process group id, or 0 for self
|
|
* @return 0 on success, or errno on error
|
|
*/
|
|
int posix_spawnattr_setpgroup(posix_spawnattr_t *attr, int pgroup) {
|
|
(*attr)->flags |= POSIX_SPAWN_SETPGROUP;
|
|
(*attr)->pgroup = pgroup;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Gets signal mask for sigprocmask() in child process.
|
|
*
|
|
* The signal mask is applied to the child process in such a way that
|
|
* signal handlers from the parent process can't get triggered in the
|
|
* child process.
|
|
*
|
|
* @return 0 on success, or errno on error
|
|
*/
|
|
int posix_spawnattr_getsigmask(const posix_spawnattr_t *attr,
|
|
sigset_t *sigmask) {
|
|
*sigmask = (*attr)->sigmask;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Specifies signal mask for sigprocmask() in child process.
|
|
*
|
|
* This setter also sets the `POSIX_SPAWN_SETSIGMASK` flag.
|
|
*
|
|
* @return 0 on success, or errno on error
|
|
*/
|
|
int posix_spawnattr_setsigmask(posix_spawnattr_t *attr,
|
|
const sigset_t *sigmask) {
|
|
(*attr)->flags |= POSIX_SPAWN_SETSIGMASK;
|
|
(*attr)->sigmask = *sigmask;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Retrieves which signals will be restored to `SIG_DFL`.
|
|
*
|
|
* @return 0 on success, or errno on error
|
|
*/
|
|
int posix_spawnattr_getsigdefault(const posix_spawnattr_t *attr,
|
|
sigset_t *sigdefault) {
|
|
*sigdefault = (*attr)->sigdefault;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Specifies which signals should be restored to `SIG_DFL`.
|
|
*
|
|
* This routine isn't necessary in most cases, since posix_spawn() by
|
|
* default will try to avoid vfork() race conditions by tracking what
|
|
* signals have a handler function and then resets them automatically
|
|
* within the child process, before applying the child's signal mask.
|
|
* This function may be used to ensure the `SIG_IGN` disposition will
|
|
* not propagate across execve in cases where this process explicitly
|
|
* set the signals to `SIG_IGN` earlier (since posix_spawn() will not
|
|
* issue O(128) system calls just to be totally pedantic about that).
|
|
*
|
|
* Using this setter automatically sets `POSIX_SPAWN_SETSIGDEF`.
|
|
*
|
|
* @return 0 on success, or errno on error
|
|
*/
|
|
int posix_spawnattr_setsigdefault(posix_spawnattr_t *attr,
|
|
const sigset_t *sigdefault) {
|
|
(*attr)->flags |= POSIX_SPAWN_SETSIGDEF;
|
|
(*attr)->sigdefault = *sigdefault;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Gets resource limit for spawned process.
|
|
*
|
|
* @return 0 on success, or errno on error
|
|
* @raise EINVAL if `resource` is invalid
|
|
* @raise ENOENT if `resource` is absent
|
|
*/
|
|
int posix_spawnattr_getrlimit(const posix_spawnattr_t *attr, int resource,
|
|
struct rlimit *rlim) {
|
|
if ((0 <= resource && resource < ARRAYLEN((*attr)->rlim))) {
|
|
if (((*attr)->rlimset & (1u << resource))) {
|
|
*rlim = (*attr)->rlim[resource];
|
|
return 0;
|
|
} else {
|
|
return ENOENT;
|
|
}
|
|
} else {
|
|
return EINVAL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Sets resource limit on spawned process.
|
|
*
|
|
* Using this setter automatically sets `POSIX_SPAWN_SETRLIMIT`.
|
|
*
|
|
* @return 0 on success, or errno on error
|
|
* @raise EINVAL if resource is invalid
|
|
*/
|
|
int posix_spawnattr_setrlimit(posix_spawnattr_t *attr, int resource,
|
|
const struct rlimit *rlim) {
|
|
if (0 <= resource && resource < ARRAYLEN((*attr)->rlim)) {
|
|
(*attr)->flags |= POSIX_SPAWN_SETRLIMIT;
|
|
(*attr)->rlimset |= 1u << resource;
|
|
(*attr)->rlim[resource] = *rlim;
|
|
return 0;
|
|
} else {
|
|
return EINVAL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Gets scheduler policy that'll be used for spawned process.
|
|
*
|
|
* @param attr was initialized by posix_spawnattr_init()
|
|
* @param schedpolicy receives the result
|
|
* @return 0 on success, or errno on error
|
|
*/
|
|
int posix_spawnattr_getschedpolicy(const posix_spawnattr_t *attr,
|
|
int *schedpolicy) {
|
|
*schedpolicy = (*attr)->schedpolicy;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Specifies scheduler policy override for spawned process.
|
|
*
|
|
* Using this setter automatically sets `POSIX_SPAWN_SETSCHEDULER`.
|
|
*
|
|
* @param attr was initialized by posix_spawnattr_init()
|
|
* @return 0 on success, or errno on error
|
|
*/
|
|
int posix_spawnattr_setschedpolicy(posix_spawnattr_t *attr, int schedpolicy) {
|
|
(*attr)->flags |= POSIX_SPAWN_SETSCHEDULER;
|
|
(*attr)->schedpolicy = schedpolicy;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Gets scheduler parameter.
|
|
*
|
|
* @param attr was initialized by posix_spawnattr_init()
|
|
* @param schedparam receives the result
|
|
* @return 0 on success, or errno on error
|
|
*/
|
|
int posix_spawnattr_getschedparam(const posix_spawnattr_t *attr,
|
|
struct sched_param *schedparam) {
|
|
*schedparam = (*attr)->schedparam;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Specifies scheduler parameter override for spawned process.
|
|
*
|
|
* Using this setter automatically sets `POSIX_SPAWN_SETSCHEDPARAM`.
|
|
*
|
|
* @param attr was initialized by posix_spawnattr_init()
|
|
* @param schedparam receives the result
|
|
* @return 0 on success, or errno on error
|
|
*/
|
|
int posix_spawnattr_setschedparam(posix_spawnattr_t *attr,
|
|
const struct sched_param *schedparam) {
|
|
(*attr)->flags |= POSIX_SPAWN_SETSCHEDPARAM;
|
|
(*attr)->schedparam = *schedparam;
|
|
return 0;
|
|
}
|