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[libc] Enable setitimer and getitimer functions on riscv #139182

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Merged
merged 2 commits into from
May 16, 2025
Merged

[libc] Enable setitimer and getitimer functions on riscv #139182

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[libc] Enable setitimer and getitimer functions on riscv
mikhailramalho May 8, 2025
2bf2cea
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mikhailramalho May 9, 2025
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4 changes: 2 additions & 2 deletions libc/config/linux/riscv/entrypoints.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -371,8 +371,8 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.sys.uio.readv

# sys/time.h entrypoints
# libc.src.sys.time.setitimer
# libc.src.sys.time.getitimer
libc.src.sys.time.setitimer
libc.src.sys.time.getitimer
)

if(LLVM_LIBC_INCLUDE_SCUDO)
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18 changes: 16 additions & 2 deletions libc/src/sys/time/linux/getitimer.cpp
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Expand Up @@ -16,8 +16,22 @@
namespace LIBC_NAMESPACE_DECL {

LLVM_LIBC_FUNCTION(int, getitimer, (int which, struct itimerval *curr_value)) {
long ret =
LIBC_NAMESPACE::syscall_impl<long>(SYS_getitimer, which, curr_value);
long ret = 0;
if constexpr (sizeof(time_t) > sizeof(long)) {
// There is no SYS_getitimer_time64 call, so we can't use time_t directly.
long curr_value32[4];
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@mikhailramalho mikhailramalho May 9, 2025

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I created an array of long because it was less verbose than creating a local struct just for this, but please let me know if you have other suggestions.

ret = LIBC_NAMESPACE::syscall_impl<long>(SYS_getitimer, which, curr_value32);
if (!ret) {
curr_value->it_interval.tv_sec = curr_value32[0];
curr_value->it_interval.tv_usec = curr_value32[1];
curr_value->it_value.tv_sec = curr_value32[2];
curr_value->it_value.tv_usec = curr_value32[3];
}
} else {
ret =
LIBC_NAMESPACE::syscall_impl<long>(SYS_getitimer, which, curr_value);
}

// On failure, return -1 and set errno.
if (ret < 0) {
libc_errno = static_cast<int>(-ret);
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26 changes: 24 additions & 2 deletions libc/src/sys/time/linux/setitimer.cpp
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Expand Up @@ -17,8 +17,30 @@ namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(int, setitimer,
(int which, const struct itimerval *new_value,
struct itimerval *old_value)) {
long ret = LIBC_NAMESPACE::syscall_impl<long>(SYS_setitimer, which, new_value,
old_value);
long ret = 0;
if constexpr (sizeof(time_t) > sizeof(long)) {
// There is no SYS_setitimer_time64 call, so we can't use time_t directly,
// and need to convert it to long first.
long new_value32[4] = {static_cast<long>(new_value->it_interval.tv_sec),
new_value->it_interval.tv_usec,
static_cast<long>(new_value->it_value.tv_sec),
new_value->it_value.tv_usec};
long old_value32[4];

ret = LIBC_NAMESPACE::syscall_impl<long>(SYS_setitimer, which, new_value32,
old_value32);

if (!ret && old_value) {
old_value->it_interval.tv_sec = old_value32[0];
old_value->it_interval.tv_usec = old_value32[1];
old_value->it_value.tv_sec = old_value32[2];
old_value->it_value.tv_usec = old_value32[3];
}
} else {
ret = LIBC_NAMESPACE::syscall_impl<long>(SYS_setitimer, which, new_value,
old_value);
}

// On failure, return -1 and set errno.
if (ret < 0) {
libc_errno = static_cast<int>(-ret);
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