ppoll
Implemented in Antinomie 0.7.0 · Syscall list
Synopsis
Section titled “Synopsis”long ppoll(struct pollfd *ufds, unsigned int nfds, struct __kernel_timespec *tsp, const sigset_t *sigmask, size_t sigsetsize);| Number (x86-64) | 271 |
| ABI | common |
| Kernel entry point | sys_ppoll |
This is the raw kernel prototype from the pinned Linux 6.12.94 schema, not the libc wrapper.
Description
Section titled “Description”Like poll with a nanosecond timeout and an atomic signal mask.
Arguments
Section titled “Arguments”| Name | Type | Meaning |
|---|---|---|
ufds (arg0) |
struct pollfd * |
Pointer to an array of pollfd structures. |
nfds (arg1) |
unsigned int |
Number of entries in the array. |
tsp (arg2) |
struct __kernel_timespec * |
Pointer to a time structure. |
sigmask (arg3) |
const sigset_t * |
Pointer to the signal mask to apply. |
sigsetsize (arg4) |
size_t |
Size in bytes of the signal set; must be sizeof(sigset_t), 8. |
Return value
Section titled “Return value”On success: the number of descriptors with events, 0 on timeout.
In an Antinomie trace the Return column and the ret filter field show the raw kernel return value. On failure that is the negative errno, for example -2 for ENOENT, not the -1 plus errno that the libc wrapper gives. syscall.errno holds the positive errno and syscall.success is false.
Common errors
Section titled “Common errors”| Raw return | Name | Meaning |
|---|---|---|
-14 |
EFAULT |
A pointer argument points outside the accessible address space. |
-4 |
EINTR |
The call was interrupted by a signal. |
Man page
Section titled “Man page”Captured by Antinomie
Section titled “Captured by Antinomie”Coverage mark: Implemented. Every pointer argument has a capture rule in the pinned kernel patch and none of them records a “no decoder”, “address only” or “not observed” gap on any code path. Individual values can still be incomplete on a particular call; see the capture statuses.
Every call is recorded as an Entry record (the six argument words and the pointees copied at entry) and an Exit record (the return value and the pointees copied at exit).
Arguments
Section titled “Arguments”| Argument | When | How | Recorded field key | Condition |
|---|---|---|---|---|
ufds (arg0) |
Entry | the pointer itself, as a raw word | args.0, args.raw[0] |
|
| ↳ pointee | Entry and exit | array of pollfd, count from nfds (arg1) |
arg0.pollfd |
at exit when the result is 0 or greater, or the call was interrupted |
nfds (arg1) |
Entry | raw scalar word | args.1, args.nfds |
|
tsp (arg2) |
Entry | the pointer itself, as a raw word | args.2, args.raw[2] |
|
| ↳ pointee | Entry | structure timespec (16 bytes) |
arg2.timeout |
always |
| ↳ pointee | Exit | structure timespec, the time left |
arg2.timeout.observed |
result is 0 or greater, or the call was interrupted |
sigmask (arg3) |
Entry | the pointer itself, as a raw word | args.3, args.raw[3] |
|
| ↳ pointee | Entry | signal set, size from sigsetsize (arg4) |
signal.mask |
the pointer is not NULL |
sigsetsize (arg4) |
Entry | raw scalar word | args.4, args.sigsetsize |
Filter fields
Section titled “Filter fields”- Result:
ret,syscall.errno,syscall.success,syscall.duration_ns. - Argument words:
args.ufds(arg0),args.nfds(arg1),args.tsp(arg2),args.sigmask(arg3),args.sigsetsize(arg4);args.0toargs.5by position. - Structure
pollfd[]behindufds(arg0):args.ufds.<member>forevents,fd,revents. - Structure
timespec[2]behindtsp(arg2):args.tsp.<member>fortv_nsec,tv_sec.
See Syscall Trace filter for the full syntax.
For what the capture statuses mean, see Capture statuses. For what is never recorded, see Known gaps.