Johannes Sixt [off-list ref] writes:
Windows does not have process groups. It is, therefore, the simplest
to pretend that each process is in its own process group.
While here, move the getppid() stub from its old location (between
two sync related functions) next to the two new functions.
Signed-off-by: Johannes Sixt <redacted>
---
Thanks for a quick update.
The patch should do for now, but I suspect that it may give us a
better abstraction to make the "is_foreground_fd(int fd)" or even
"is_foreground(void)" the public API that would be implemented as
int we_are_in_the_foreground(void)
{
return getpgid(0) == tcgetpgrp(fileno(stderr));
}
in POSIX and Windows can implement entirely differently.
Thoughts?
quoted hunk
compat/mingw.h | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/compat/mingw.h b/compat/mingw.h
index 7b523cf..a552026 100644
--- a/compat/mingw.h
+++ b/compat/mingw.h
@@ -95,8 +95,6 @@ static inline unsigned int alarm(unsigned int seconds)
{ return 0; }
static inline int fsync(int fd)
{ return _commit(fd); }
-static inline pid_t getppid(void)
-{ return 1; }
static inline void sync(void)
{}
static inline uid_t getuid(void)@@ -118,6 +116,12 @@ static inline int sigaddset(sigset_t *set, int signum)
#define SIG_UNBLOCK 0
static inline int sigprocmask(int how, const sigset_t *set, sigset_t *oldset)
{ return 0; }
+static inline pid_t getppid(void)
+{ return 1; }
+static inline pid_t getpgid(pid_t pid)
+{ return pid == 0 ? getpid() : pid; }
+static inline pid_t tcgetpgrp(int fd)
+{ return getpid(); }
/*
* simple adaptors
--
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Am 15.04.2015 um 20:48 schrieb Junio C Hamano:
The patch should do for now, but I suspect that it may give us a
better abstraction to make the "is_foreground_fd(int fd)" or even
"is_foreground(void)" the public API that would be implemented as
int we_are_in_the_foreground(void)
{
return getpgid(0) == tcgetpgrp(fileno(stderr));
}
in POSIX and Windows can implement entirely differently.
Thoughts?
IMHO, this level of abstraction goes too far. It may be that I am not
familiar with process groups, and I find the implementation of
is_foreground_fd() in progress.c close to where it's used quite
educating and enlightening. Hiding a similar implementation miles away
in cache.h and/or compat/ would not pay off for me.
-- Hannes
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Hi Junio,
On 2015-04-15 20:48, Junio C Hamano wrote:
Johannes Sixt [off-list ref] writes:
quoted
Windows does not have process groups. It is, therefore, the simplest
to pretend that each process is in its own process group.
While here, move the getppid() stub from its old location (between
two sync related functions) next to the two new functions.
Signed-off-by: Johannes Sixt <redacted>
---
Thanks for a quick update.
The patch should do for now, but I suspect that it may give us a
better abstraction to make the "is_foreground_fd(int fd)" or even
"is_foreground(void)" the public API that would be implemented as
int we_are_in_the_foreground(void)
{
return getpgid(0) == tcgetpgrp(fileno(stderr));
}
in POSIX and Windows can implement entirely differently.
I really like it. We already require a couple of workarounds to be able to use `mintty` (which is a replacement terminal emulator that is more flexible than the default Windows terminal window, but it comes at the price that most Win32 programs think they are not running interactively inside a `mintty` session). I would really like to avoid having to finagle some really ugly code into `getpgid()` to make that test work.
In general, I find it rewarding not only from a portability point of view, but *especially* from a readability one if the code contains functions that are named semantically, i.e. they describe *why* they are called, not *how* they answer the question.
In this case, I would prefer the `is_foreground_fd(int fd)` one, but I am sure I can make the other signature work for us, too.
Ciao,
Dscho
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