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/*
* 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);
}
int do_fd_copy(int fd1, int fd2, int limit, char *desc) {
char *buf, *sbuf;
int count, bufsize = 32768;
char *er_msg_1 = _("failed to allocate buffer for copy (%s)");
char *er_msg_2 = _("failed in copy on write (%s)");
char *er_msg_3 = _("failed in copy on read (%s)");
count = strlen(er_msg_1) + strlen(desc) + 1;
sbuf = malloc(count);
if(sbuf == NULL)
ohshite(_("failed to allocate buffer for snprintf 1"));
snprintf(sbuf, count, er_msg_1, desc);
sbuf[count-1] = 0;
if((limit != -1) && (limit < bufsize))
bufsize = limit;
buf = malloc(bufsize);
if(buf == NULL)
ohshite(sbuf);
free(sbuf);
while((count = read(fd1, buf, bufsize)) > 0) {
if(write(fd2, buf, count) < count) {
count = strlen(er_msg_2) + strlen(desc) + 1;
sbuf = malloc(count);
if(sbuf == NULL)
ohshite(_("failed in copy on write"));
snprintf(sbuf, count, er_msg_2, desc);
sbuf[count-1] = 0;
ohshite(sbuf);
}
if(limit != -1) {
limit -= count;
if(limit < bufsize)
bufsize = limit;
}
}
free(sbuf);
if (count<0) {
count = strlen(er_msg_3) + strlen(desc) + 1;
sbuf = malloc(count);
if(sbuf == NULL)
ohshite(_("failed in copy on read"));
snprintf(sbuf, count, er_msg_3, desc);
sbuf[count-1] = 0;
ohshite(sbuf);
}
free(sbuf);
free(buf);
}
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