From ba26f296f9ddc694fc42683132bc328dffd777ec Mon Sep 17 00:00:00 2001
From: Johannes Sixt <johannes.sixt@telecom.at>
Date: Fri, 7 Dec 2007 22:08:59 +0100
Subject: Windows: Implement start_command().
On Windows, we have spawnv() variants to run a child process instead of
fork()/exec(). In order to attach pipe ends to stdin, stdout, and stderr,
we have to use this idiom:
save1 = dup(1);
dup2(pipe[1], 1);
spawnv();
dup2(save1, 1);
close(pipe[1]);
assuming that the descriptors created by pipe() are not inheritable.
Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
---
compat/mingw.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
compat/mingw.h | 8 ++++++++
2 files changed, 70 insertions(+)
(limited to 'compat')
diff --git a/compat/mingw.c b/compat/mingw.c
index 31a9b9e251..7f89a6cb87 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -315,6 +315,68 @@ void mingw_execvp(const char *cmd, char *const *argv)
free_path_split(path);
}
+char **copy_environ()
+{
+ char **env;
+ int i = 0;
+ while (environ[i])
+ i++;
+ env = xmalloc((i+1)*sizeof(*env));
+ for (i = 0; environ[i]; i++)
+ env[i] = xstrdup(environ[i]);
+ env[i] = NULL;
+ return env;
+}
+
+void free_environ(char **env)
+{
+ int i;
+ for (i = 0; env[i]; i++)
+ free(env[i]);
+ free(env);
+}
+
+static int lookup_env(char **env, const char *name, size_t nmln)
+{
+ int i;
+
+ for (i = 0; env[i]; i++) {
+ if (0 == strncmp(env[i], name, nmln)
+ && '=' == env[i][nmln])
+ /* matches */
+ return i;
+ }
+ return -1;
+}
+
+/*
+ * If name contains '=', then sets the variable, otherwise it unsets it
+ */
+char **env_setenv(char **env, const char *name)
+{
+ char *eq = strchrnul(name, '=');
+ int i = lookup_env(env, name, eq-name);
+
+ if (i < 0) {
+ if (*eq) {
+ for (i = 0; env[i]; i++)
+ ;
+ env = xrealloc(env, (i+2)*sizeof(*env));
+ env[i] = xstrdup(name);
+ env[i+1] = NULL;
+ }
+ }
+ else {
+ free(env[i]);
+ if (*eq)
+ env[i] = xstrdup(name);
+ else
+ for (; env[i]; i++)
+ env[i] = env[i+1];
+ }
+ return env;
+}
+
#undef rename
int mingw_rename(const char *pold, const char *pnew)
{
diff --git a/compat/mingw.h b/compat/mingw.h
index 0ce9c96f93..0879894c68 100644
--- a/compat/mingw.h
+++ b/compat/mingw.h
@@ -165,3 +165,11 @@ sig_handler_t mingw_signal(int sig, sig_handler_t handler);
#define is_dir_sep(c) ((c) == '/' || (c) == '\\')
#define PATH_SEP ';'
#define PRIuMAX "I64u"
+
+/*
+ * helpers
+ */
+
+char **copy_environ(void);
+void free_environ(char **env);
+char **env_setenv(char **env, const char *name);
--
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