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os: improve os.executable() on OpenBSD (#20356)

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Delyan Angelov 2024-01-02 22:12:03 +02:00 • committed by GitHub
parent d9689712f8
commit bf7b29a53b
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1 changed files with 28 additions and 4 deletions
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32
vlib/os/os.c.v
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@ -5,7 +5,7 @@ import strings
#include <sys/stat.h> // #include <signal.h>
#include <errno.h>
$if freebsd {
$if freebsd || openbsd {
#include <sys/sysctl.h>
}
@ -721,6 +721,33 @@ pub fn executable() string {
res := unsafe { tos_clone(&result[0]) }
return res
}
$if openbsd {
// Sadly, unlike on FreeBSD, there is still no reliable way, to get the full path of the
// current process in OpenBSD. However, we can try our best, by first checking, if the passed
// argv[0] to the process, contains an absolute path (starting with /), according to the kernel,
// and only go use the slower PATH scanning fallback method, when it does not.
// See also https://github.com/gpakosz/whereami/blob/master/src/whereami.c#L591
// and https://github.com/ziglang/zig/issues/6718#issuecomment-711134120 .
mut pbuf := unsafe { &&u8(&result[0]) }
bufsize := usize(max_path_buffer_size)
pid := C.getpid()
mib := [C.CTL_KERN, C.KERN_PROC_ARGS, pid, C.KERN_PROC_ARGV]!
if unsafe { C.sysctl(&mib[0], mib.len, C.NULL, &bufsize, C.NULL, 0) } == 0 {
if bufsize > max_path_buffer_size {
pbuf = unsafe { &&u8(malloc(bufsize)) }
defer {
unsafe { free(pbuf) }
}
}
if unsafe { C.sysctl(&mib[0], mib.len, pbuf, &bufsize, C.NULL, 0) } == 0 {
if unsafe { *pbuf[0] } == `/` {
res := unsafe { tos_clone(pbuf[0]) }
return res
}
}
}
return executable_fallback()
}
$if netbsd {
count := C.readlink(c'/proc/curproc/exe', &char(&result[0]), max_path_len)
if count < 0 {
@ -748,9 +775,6 @@ pub fn executable() string {
res := unsafe { tos_clone(&result[0]) }
return res
}
// "Sadly there is no way to get the full path of the executed file in OpenBSD."
$if openbsd {
}
$if solaris {
}
$if haiku {