2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
129 lines
2.3 KiB
C
129 lines
2.3 KiB
C
/*
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* popen - open a pipe
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*/
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/* $Header$ */
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#include <sys/cdefs.h>
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#include "namespace.h"
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#include <minix/ansi.h>
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#ifdef __weak_alias
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__weak_alias(popen, _popen)
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__weak_alias(pclose, _pclose)
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#endif
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#include <sys/types.h>
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#include <limits.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#if defined(__BSD4_2)
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union wait {
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int w_status;
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};
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typedef union wait wait_arg;
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#else
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typedef int wait_arg;
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#endif /* __BSD4_2 */
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#ifdef _ANSI
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int _close(int d);
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int _dup2(int oldd, int newd); /* not present in System 5 */
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int _execl(const char *name, const char *_arg, ... );
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pid_t _fork(void);
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int _pipe(int fildes[2]);
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pid_t _wait(wait_arg *status);
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void _exit(int status);
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#endif
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static int pids[OPEN_MAX];
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FILE *
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popen(command, type)
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_CONST char *command;
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_CONST char *type;
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{
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int piped[2];
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int Xtype = *type == 'r' ? 0 : *type == 'w' ? 1 : 2;
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int pid;
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if (Xtype == 2 ||
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_pipe(piped) < 0 ||
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(pid = _fork()) < 0) return 0;
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if (pid == 0) {
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/* child */
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register int *p;
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for (p = pids; p < &pids[OPEN_MAX]; p++) {
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if (*p) _close((int)(p - pids));
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}
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_close(piped[Xtype]);
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_dup2(piped[!Xtype], !Xtype);
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_close(piped[!Xtype]);
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_execl("/bin/sh", "sh", "-c", command, (char *) 0);
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_exit(127); /* like system() ??? */
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}
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pids[piped[Xtype]] = pid;
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_close(piped[!Xtype]);
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return fdopen(piped[Xtype], type);
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}
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#if defined(__BSD4_2)
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#define ret_val status.w_status
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#else
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#define ret_val status
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#endif
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int
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pclose(stream)
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FILE *stream;
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{
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int fd = fileno(stream);
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wait_arg status;
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int wret;
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#ifdef _ANSI
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void (*intsave)(int) = signal(SIGINT, SIG_IGN);
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void (*quitsave)(int) = signal(SIGQUIT, SIG_IGN);
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#else
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void (*intsave)() = signal(SIGINT, SIG_IGN);
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void (*quitsave)() = signal(SIGQUIT, SIG_IGN);
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#endif
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fclose(stream);
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while ((wret = _wait(&status)) != -1) {
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if (wret == pids[fd]) break;
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}
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if (wret == -1) ret_val = -1;
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signal(SIGINT, intsave);
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signal(SIGQUIT, quitsave);
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pids[fd] = 0;
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return ret_val;
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}
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#if defined(__USG)
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int _dup(int fildes);
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static int
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_dup2(oldd, newd)
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int oldd, newd;
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{
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int i = 0, fd, tmp;
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int fdbuf[_NFILES];
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/* ignore the error on the close() */
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tmp = errno; (void) _close(newd); errno = tmp;
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while ((fd = _dup(oldd)) != newd) {
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if (fd == -1) break;
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fdbuf[i++] = fd;
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}
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tmp = errno;
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while (--i >= 0) {
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_close(fdbuf[i]);
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}
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errno = tmp;
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return -(fd == -1);
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}
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#endif /* __USG */
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