nginx/src/os/unix/ngx_setproctitle.c

/*
 * 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)
{ … }


void
ngx_setproctitle(char *title)
{ … }

#endif /* NGX_SETPROCTITLE_USES_ENV */