diff options
Diffstat (limited to 'missing/setproctitle.c')
| -rw-r--r-- | missing/setproctitle.c | 68 |
1 files changed, 62 insertions, 6 deletions
diff --git a/missing/setproctitle.c b/missing/setproctitle.c index 811829c060..5b2dfa65ce 100644 --- a/missing/setproctitle.c +++ b/missing/setproctitle.c @@ -80,10 +80,43 @@ static char **argv1_addr = NULL; #endif /* HAVE_SETPROCTITLE */ +#if defined(SPT_TYPE) && SPT_TYPE == SPT_REUSEARGV +# define ALLOCATE_ENVIRON 1 +#else +# define ALLOCATE_ENVIRON 0 +#endif + +#if ALLOCATE_ENVIRON +/* system_environ is the value of environ before we allocate a custom buffer. + * + * We use this to restore environ in ruby_free_proctitle. + */ +static char **system_environ = NULL; +/* orig_environ is the buffer we allocate for environ. + * + * We use this to free this buffer in ruby_free_proctitle. When we add new + * environment variables using setenv, the system may change environ to a + * different buffer and will not free the original buffer, so we need to hold + * onto this so we can free it in ruby_free_proctitle. + * + * We must not free any of the contents because it may change if the system + * updates existing environment variables. + */ +static char **orig_environ = NULL; +/* alloc_environ is a copy of orig_environ. + * + * We use this to free all the original string copies that were in orig_environ. + * Since environ could be changed to point to strings allocated by the system + * if environment variables are updated, so we need this to point to the + * original strings. + */ +static char **alloc_environ = NULL; +#endif + void compat_init_setproctitle(int argc, char *argv[]) { -#if defined(SPT_TYPE) && SPT_TYPE == SPT_REUSEARGV +#if ALLOCATE_ENVIRON extern char **environ; char *lastargv = NULL; char *lastenvp = NULL; @@ -100,9 +133,13 @@ compat_init_setproctitle(int argc, char *argv[]) return; /* Fail if we can't allocate room for the new environment */ - for (i = 0; envp[i] != NULL; i++) - ; - if ((environ = calloc(i + 1, sizeof(*environ))) == NULL) { + for (i = 0; envp[i] != NULL; i++); + + system_environ = environ; + + alloc_environ = xcalloc(i + 1, sizeof(*environ)); + orig_environ = environ = xcalloc(i + 1, sizeof(*environ)); + if (environ == NULL) { environ = envp; /* put it back */ return; } @@ -129,12 +166,31 @@ compat_init_setproctitle(int argc, char *argv[]) argv_env_len = lastenvp - argv[0]; for (i = 0; envp[i] != NULL; i++) - environ[i] = ruby_strdup(envp[i]); - environ[i] = NULL; + alloc_environ[i] = environ[i] = ruby_strdup(envp[i]); + alloc_environ[i] = environ[i] = NULL; #endif /* SPT_REUSEARGV */ } +void +ruby_free_proctitle(void) +{ +#if ALLOCATE_ENVIRON + extern char **environ; + + if (!orig_environ) return; /* environ is allocated by OS */ + + for (int i = 0; alloc_environ[i] != NULL; i++) { + xfree(alloc_environ[i]); + } + xfree(alloc_environ); + xfree(orig_environ); + + environ = system_environ; +#endif +} + #ifndef HAVE_SETPROCTITLE + void setproctitle(const char *fmt, ...) { |