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unix: implement alarm(2) on Linux on all GOARCH except arm* and riscv.

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SYS_ALARM is not defined for arm* or riscv, but is available for all other
Linux GOARCH values. Ian suggested I create a new file with build tags
matching these constraints.

In order to handle special case files such as this one (which don't match the
existing syscall_linux_goarch.go scheme), I've added logic to the Linux build
system which can evaluate the build constraints in a given file to determine
whether that file should be appended to the arguments for a given target.

Change-Id: I0136534522a26a0ce495308f63953546ea6bb8e5
Reviewed-on: https://go-review.googlesource.com/c/sys/+/383734
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Daniel Martí <mvdan@mvdan.cc>
This commit is contained in:
Matt Layher
2022-02-07 23:40:03 +00:00
committed by Ian Lance Taylor
parent 1c1b9b1eba
commit 5739886226
13 changed files with 218 additions and 12 deletions
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unix/zsyscall_linux_mips.go
+12 -1
View File
@@ -1,4 +1,4 @@
// go run mksyscall.go -b32 -arm -tags linux,mips syscall_linux.go syscall_linux_mipsx.go
// go run mksyscall.go -b32 -arm -tags linux,mips syscall_linux.go syscall_linux_mipsx.go syscall_linux_alarm.go
// Code generated by the command above; see README.md. DO NOT EDIT.
//go:build linux && mips
@@ -702,3 +702,14 @@ func setrlimit(resource int, rlim *rlimit32) (err error) {
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func Alarm(seconds uint) (remaining uint, err error) {
r0, _, e1 := Syscall(SYS_ALARM, uintptr(seconds), 0, 0)
remaining = uint(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}