1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
/*
* libdpkg - Debian packaging suite library routines
* mlib.c - `must' library: routines will succeed or longjmp
*
* Copyright (C) 1994,1995 Ian Jackson <iwj10@cus.cam.ac.uk>
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2,
* or (at your option) any later version.
*
* This is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with dpkg; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
#include <sys/wait.h>
#include <sys/types.h>
#include "config.h"
#include "dpkg.h"
/* Incremented when we do some kind of generally necessary operation, so that
* loops &c know to quit if we take an error exit. Decremented again afterwards.
*/
volatile int onerr_abort= 0;
void *m_malloc(size_t amount) {
#ifdef MDEBUG
unsigned short *r2, x;
#endif
void *r;
onerr_abort++;
r= malloc(amount);
if (!r) ohshite("malloc failed (%ld bytes)",(long)amount);
onerr_abort--;
#ifdef MDEBUG
r2= r; x= (unsigned short)amount ^ 0xf000;
while (amount >= 2) { *r2++= x; amount -= 2; }
#endif
return r;
}
void *m_realloc(void *r, size_t amount) {
onerr_abort++;
r= realloc(r,amount);
if (!r) ohshite("realloc failed (%ld bytes)",(long)amount);
onerr_abort--;
return r;
}
static void print_error_forked(const char *emsg, const char *contextstring) {
fprintf(stderr, "%s (subprocess): %s\n", thisname, emsg);
}
static void cu_m_fork(int argc, void **argv) {
exit(2);
/* Don't do the other cleanups, because they'll be done by/in the parent
* process.
*/
}
int m_fork(void) {
pid_t r;
r= fork();
if (r == -1) { onerr_abort++; ohshite("fork failed"); }
if (r > 0) return r;
push_cleanup(cu_m_fork,~0, 0,0, 0);
set_error_display(print_error_forked,0);
return r;
}
void m_dup2(int oldfd, int newfd) {
const char *const stdstrings[]= { "in", "out", "err" };
if (dup2(oldfd,newfd) == newfd) return;
onerr_abort++;
if (newfd < 3) ohshite("failed to dup for std%s",stdstrings[newfd]);
ohshite("failed to dup for fd %d",newfd);
}
void m_pipe(int *fds) {
if (!pipe(fds)) return;
onerr_abort++;
ohshite("failed to create pipe");
}
void checksubprocerr(int status, const char *description, int sigpipeok) {
int n;
if (WIFEXITED(status)) {
n= WEXITSTATUS(status); if (!n) return;
ohshit("subprocess %s returned error exit status %d",description,n);
} else if (WIFSIGNALED(status)) {
n= WTERMSIG(status); if (!n || (sigpipeok && n==SIGPIPE)) return;
ohshit("subprocess %s killed by signal (%s)%s",
description, strsignal(n), WCOREDUMP(status) ? ", core dumped" : "");
} else {
ohshit("subprocess %s failed with wait status code %d",description,status);
}
}
void waitsubproc(pid_t pid, const char *description, int sigpipeok) {
pid_t r;
int status;
while ((r= waitpid(pid,&status,0)) == -1 && errno == EINTR);
if (r != pid) { onerr_abort++; ohshite("wait for %s failed",description); }
checksubprocerr(status,description,sigpipeok);
}
|
