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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#if (NGX_SETPROCTITLE_USES_ENV)
/*
* To change the process title in Linux and Solaris we have to set argv[1]
* to NULL and to copy the title to the same place where the argv[0] points to.
* However, argv[0] may be too small to hold a new title. Fortunately, Linux
* and Solaris store argv[] and environ[] one after another. So we should
* ensure that is the continuous memory and then we allocate the new memory
* for environ[] and copy it. After this we could use the memory starting
* from argv[0] for our process title.
*
* The Solaris's standard /bin/ps does not show the changed process title.
* You have to use "/usr/ucb/ps -w" instead. Besides, the UCB ps does not
* show a new title if its length less than the origin command line length.
* To avoid it we append to a new title the origin command line in the
* parenthesis.
*/
extern char **environ;
static char *ngx_os_argv_last;
ngx_int_t
ngx_init_setproctitle(ngx_log_t *log)
{
u_char *p;
size_t size;
ngx_uint_t i;
size = 0;
for (i = 0; environ[i]; i++) {
size += ngx_strlen(environ[i]) + 1;
}
p = ngx_alloc(size, log);
if (p == NULL) {
return NGX_ERROR;
}
ngx_os_argv_last = ngx_os_argv[0];
for (i = 0; ngx_os_argv[i]; i++) {
if (ngx_os_argv_last == ngx_os_argv[i]) {
ngx_os_argv_last = ngx_os_argv[i] + ngx_strlen(ngx_os_argv[i]) + 1;
}
}
for (i = 0; environ[i]; i++) {
if (ngx_os_argv_last == environ[i]) {
size = ngx_strlen(environ[i]) + 1;
ngx_os_argv_last = environ[i] + size;
ngx_cpystrn(p, (u_char *) environ[i], size);
environ[i] = (char *) p;
p += size;
}
}
ngx_os_argv_last--;
return NGX_OK;
}
void
ngx_setproctitle(char *title)
{
u_char *p;
#if (NGX_SOLARIS)
ngx_int_t i;
size_t size;
#endif
ngx_os_argv[1] = NULL;
p = ngx_cpystrn((u_char *) ngx_os_argv[0], (u_char *) "nginx: ",
ngx_os_argv_last - ngx_os_argv[0]);
p = ngx_cpystrn(p, (u_char *) title, ngx_os_argv_last - (char *) p);
#if (NGX_SOLARIS)
size = 0;
for (i = 0; i < ngx_argc; i++) {
size += ngx_strlen(ngx_argv[i]) + 1;
}
if (size > (size_t) ((char *) p - ngx_os_argv[0])) {
/*
* ngx_setproctitle() is too rare operation so we use
* the non-optimized copies
*/
p = ngx_cpystrn(p, (u_char *) " (", ngx_os_argv_last - (char *) p);
for (i = 0; i < ngx_argc; i++) {
p = ngx_cpystrn(p, (u_char *) ngx_argv[i],
ngx_os_argv_last - (char *) p);
p = ngx_cpystrn(p, (u_char *) " ", ngx_os_argv_last - (char *) p);
}
if (*(p - 1) == ' ') {
*(p - 1) = ')';
}
}
#endif
if (ngx_os_argv_last - (char *) p) {
ngx_memset(p, NGX_SETPROCTITLE_PAD, ngx_os_argv_last - (char *) p);
}
ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
"setproctitle: \"%s\"", ngx_os_argv[0]);
}
#endif /* NGX_SETPROCTITLE_USES_ENV */
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