Ruby  2.0.0p451(2014-02-24revision45167)
setproctitle.c
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1 /* Based on setproctitle.c from openssh-5.6p1 */
2 /* Based on conf.c from UCB sendmail 8.8.8 */
3 
4 /*
5  * Copyright 2003 Damien Miller
6  * Copyright (c) 1983, 1995-1997 Eric P. Allman
7  * Copyright (c) 1988, 1993
8  * The Regents of the University of California. All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  * notice, this list of conditions and the following disclaimer in the
17  * documentation and/or other materials provided with the distribution.
18  * 3. Neither the name of the University nor the names of its contributors
19  * may be used to endorse or promote products derived from this software
20  * without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  */
34 
35 #include "ruby.h"
36 #include "ruby/util.h"
37 #define compat_init_setproctitle ruby_init_setproctitle
38 
39 #ifndef HAVE_SETPROCTITLE
40 
41 #include <stdarg.h>
42 #include <stdlib.h>
43 #ifdef HAVE_UNISTD_H
44 #include <unistd.h>
45 #endif
46 #ifdef HAVE_SYS_PSTAT_H
47 #include <sys/pstat.h>
48 #endif
49 #include <string.h>
50 
51 #if defined(__APPLE__)
52 # ifdef HAVE_CRT_EXTERNS_H
53 # include <crt_externs.h>
54 # undef environ
55 # define environ (*_NSGetEnviron())
56 # else
57 # include "crt_externs.h"
58 # endif
59 #endif
60 
61 #define SPT_NONE 0 /* don't use it at all */
62 #define SPT_PSTAT 1 /* use pstat(PSTAT_SETCMD, ...) */
63 #define SPT_REUSEARGV 2 /* cover argv with title information */
64 
65 #ifndef SPT_TYPE
66 # define SPT_TYPE SPT_NONE
67 #endif
68 
69 #ifndef SPT_PADCHAR
70 # define SPT_PADCHAR '\0'
71 #endif
72 
73 #if SPT_TYPE == SPT_REUSEARGV
74 static char *argv_start = NULL;
75 static size_t argv_env_len = 0;
76 static size_t argv_len = 0;
77 #endif
78 
79 #endif /* HAVE_SETPROCTITLE */
80 
81 void
83 {
84 #if defined(SPT_TYPE) && SPT_TYPE == SPT_REUSEARGV
85  extern char **environ;
86  char *lastargv = NULL;
87  char *lastenvp = NULL;
88  char **envp = environ;
89  int i;
90 
91  /*
92  * NB: This assumes that argv has already been copied out of the
93  * way. This is true for sshd, but may not be true for other
94  * programs. Beware.
95  */
96 
97  if (argc == 0 || argv[0] == NULL)
98  return;
99 
100  /* Fail if we can't allocate room for the new environment */
101  for (i = 0; envp[i] != NULL; i++)
102  ;
103  if ((environ = calloc(i + 1, sizeof(*environ))) == NULL) {
104  environ = envp; /* put it back */
105  return;
106  }
107 
108  /*
109  * Find the last argv string or environment variable within
110  * our process memory area.
111  */
112  for (i = 0; i < argc; i++) {
113  if (lastargv == NULL || lastargv + 1 == argv[i])
114  lastargv = argv[i] + strlen(argv[i]);
115  }
116  lastenvp = lastargv;
117  for (i = 0; envp[i] != NULL; i++) {
118  if (lastenvp + 1 == envp[i])
119  lastenvp = envp[i] + strlen(envp[i]);
120  }
121 
122  argv[1] = NULL;
123  argv_start = argv[0];
124  argv_len = lastargv - argv[0];
125  argv_env_len = lastenvp - argv[0];
126 
127  for (i = 0; envp[i] != NULL; i++)
128  environ[i] = ruby_strdup(envp[i]);
129  environ[i] = NULL;
130 #endif /* SPT_REUSEARGV */
131 }
132 
133 #ifndef HAVE_SETPROCTITLE
134 void
135 setproctitle(const char *fmt, ...)
136 {
137 #if SPT_TYPE != SPT_NONE
138  va_list ap;
139  char ptitle[1024];
140  size_t len;
141  size_t argvlen;
142 #if SPT_TYPE == SPT_PSTAT
143  union pstun pst;
144 #endif
145 
146 #if SPT_TYPE == SPT_REUSEARGV
147  if (argv_env_len <= 0)
148  return;
149 #endif
150 
151  va_start(ap, fmt);
152  if (fmt != NULL) {
153  vsnprintf(ptitle, sizeof(ptitle) , fmt, ap);
154  }
155  va_end(ap);
156 
157 #if SPT_TYPE == SPT_PSTAT
158  pst.pst_command = ptitle;
159  pstat(PSTAT_SETCMD, pst, strlen(ptitle), 0, 0);
160 #elif SPT_TYPE == SPT_REUSEARGV
161  len = strlcpy(argv_start, ptitle, argv_env_len);
162  argvlen = len > argv_len ? argv_env_len : argv_len;
163  for(; len < argvlen; len++)
164  argv_start[len] = SPT_PADCHAR;
165 #endif
166 
167 #endif /* SPT_NONE */
168 }
169 
170 #endif /* HAVE_SETPROCTITLE */
size_t strlen(const char *)
int i
Definition: win32ole.c:784
#define vsnprintf
RUBY_EXTERN size_t strlcpy(char *, const char *, size_t)
Definition: strlcpy.c:44
char * ruby_strdup(const char *)
Definition: util.c:456
#define calloc
Definition: ripper.c:100
#define environ
Definition: crt_externs.h:6
int argc
Definition: ruby.c:130
#define compat_init_setproctitle
Definition: setproctitle.c:37
void setproctitle(const char *fmt,...)
Definition: setproctitle.c:135
#define SPT_PADCHAR
Definition: setproctitle.c:70
#define NULL
Definition: _sdbm.c:103
char ** argv
Definition: ruby.c:131