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git://git.code.sf.net/p/cdesktopenv/code
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cleanup: libast: remove pre-fork(2) code (re: 7b0e0776)
I had removed the legacy code for systems without fork(2) from ksh93, but not from libast. This commit deos that.
This commit is contained in:
Martijn Dekker
parent
7a06d911e0
commit
7af1d56e7f
7 changed files with 71 additions and 141 deletions
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@ -65,18 +65,11 @@ CHAR_MAX C XX 1 L
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CHAR_MIN C XX 1 L
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CHAR_TERM POSIX SC 2 FUW
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CHILD_MAX POSIX SC 1 CDLMUX 6 cc{
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#if _lib_fork
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#define child() fork()
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#else
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extern int spawnve(const char*, char* const[], char* const[]);
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static char* cmd[] = { "/bin/echo", 0 };
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#define child() spawnve(cmd[0],cmd,(char**)0)
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#endif
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int main()
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{
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int i;
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int n;
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for (i = 3; i < 512 && (n = child()) >= 0; i++)
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for (i = 3; i < 512 && (n = fork()) >= 0; i++)
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if (!n) _exit(0);
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while (wait((int*)0) > 0);
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for (n = 8; n < i; n <<= 1);
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@ -2,7 +2,7 @@
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* *
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* This software is part of the ast package *
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* Copyright (c) 1985-2012 AT&T Intellectual Property *
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* Copyright (c) 2020-2021 Contributors to ksh 93u+m *
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* Copyright (c) 2020-2022 Contributors to ksh 93u+m *
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* and is licensed under the *
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* Eclipse Public License, Version 1.0 *
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* by AT&T Intellectual Property *
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@ -65,24 +65,6 @@ setsid(void)
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ioctl(fd, TIOCNOTTY, 0);
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close(fd);
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}
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#else
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/*
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* second child in s5 to avoid reacquiring the control tty
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*/
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#if _lib_fork && HUH920711 /* some s5's botch this */
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switch (fork())
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{
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case -1:
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exit(1);
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case 0:
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break;
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default:
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exit(0);
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}
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#endif
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#endif
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return(pg);
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}
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@ -174,7 +174,6 @@ spawnveg(const char* path, char* const argv[], char* const envv[], pid_t pgid, i
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pid_t
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spawnveg(const char* path, char* const argv[], char* const envv[], pid_t pgid, int tcfd)
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{
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#if _lib_fork || _lib_vfork
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int n;
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int m;
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pid_t pid;
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@ -184,19 +183,15 @@ spawnveg(const char* path, char* const argv[], char* const envv[], pid_t pgid, i
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volatile int* volatile exec_errno_ptr;
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#else
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int err[2];
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#endif
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#endif
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#endif /* _real_vfork */
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NOT_USED(tcfd);
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if (!envv)
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envv = environ;
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#if _lib_spawnve
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#if _lib_fork || _lib_vfork
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if (!pgid)
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#endif
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return spawnve(path, argv, envv);
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#endif
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#if _lib_fork || _lib_vfork
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#endif /* _lib_spawnve */
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n = errno;
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#if _real_vfork
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exec_errno = 0;
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@ -209,13 +204,13 @@ spawnveg(const char* path, char* const argv[], char* const envv[], pid_t pgid, i
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fcntl(err[0], F_SETFD, FD_CLOEXEC);
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fcntl(err[1], F_SETFD, FD_CLOEXEC);
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}
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#endif
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#endif /* _real_vfork */
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sigcritical(SIG_REG_EXEC|SIG_REG_PROC);
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#if _lib_vfork
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pid = vfork();
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#else
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pid = fork();
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#endif
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#endif /* _lib_vfork */
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if (pid == -1)
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n = errno;
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else if (!pid)
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@ -236,7 +231,7 @@ spawnveg(const char* path, char* const argv[], char* const envv[], pid_t pgid, i
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#elif defined(TIOCSPGRP)
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if (m)
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ioctl(2, TIOCSPGRP, &pgid);
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#endif
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#endif /* _lib_tcgetpgrp */
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}
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execve(path, argv, envv);
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#if _real_vfork
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@ -247,7 +242,7 @@ spawnveg(const char* path, char* const argv[], char* const envv[], pid_t pgid, i
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m = errno;
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write(err[1], &m, sizeof(m));
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}
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#endif
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#endif /* _real_vfork */
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_exit(errno == ENOENT ? EXIT_NOTFOUND : EXIT_NOEXEC);
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}
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rid = pid;
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@ -280,7 +275,7 @@ spawnveg(const char* path, char* const argv[], char* const envv[], pid_t pgid, i
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}
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close(err[0]);
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}
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#endif
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#endif /* _real_vfork */
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sigcritical(0);
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if (pid != -1 && pgid > 0)
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{
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@ -295,10 +290,6 @@ spawnveg(const char* path, char* const argv[], char* const envv[], pid_t pgid, i
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}
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errno = n;
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return rid;
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#else
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errno = ENOSYS;
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return -1;
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#endif
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}
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#endif
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@ -2,7 +2,7 @@
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* *
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* This software is part of the ast package *
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* Copyright (c) 1985-2011 AT&T Intellectual Property *
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* Copyright (c) 2020-2021 Contributors to ksh 93u+m *
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* Copyright (c) 2020-2022 Contributors to ksh 93u+m *
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* and is licensed under the *
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* Eclipse Public License, Version 1.0 *
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* by AT&T Intellectual Property *
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@ -40,12 +40,7 @@ NoN(vfork)
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extern pid_t
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vfork(void)
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{
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#if _lib_fork
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return(fork());
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#else
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errno = ENOSYS;
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return -1;
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#endif
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}
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#endif
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@ -64,6 +64,9 @@ struct _sfio_s;
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#endif
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#include <ast_lib.h>
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#if !_lib_fork
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#error In 2022, libast joined the 21st century and started requiring fork(2).
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#endif
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#include <ast_sys.h>
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#include <ast_getopt.h> /* <stdlib.h> does this */
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#include <ast_fcntl.h>
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@ -38,7 +38,7 @@
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..
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.TH PROC 3
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.SH NAME
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proc \- process control routines
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proc \- process control routines (deprecated)
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.SH SYNOPSIS
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.EX
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#include <proc.h>
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@ -50,14 +50,15 @@ int procrun(const char* \fIcommand\fP, char** \fIargv\fP);
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.EE
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.SH DESCRIPTION
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These routines provide a portable interface to process creation and execution.
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They work on systems with
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.IR fork (2)
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and
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.IR exec (2)
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as well as on systems with only
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They used to work on systems with only
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.IR spawnve (2)
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or
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.IR spawnveg (3).
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Now that libast has joined the 21st century and requires
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.IR fork (2)
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and
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.IR execve (2),
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this interface is deprecated and only kept for backward compatibility.
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.PP
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.L procopen
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runs
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@ -40,19 +40,11 @@
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* not quite ready for _use_spawnveg
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*/
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#if _use_spawnveg
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#if _lib_fork
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#undef _use_spawnveg
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#else
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#if _WINIX
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#define _lib_fork 1
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#endif
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#endif
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#endif
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#ifndef DEBUG_PROC
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#define DEBUG_PROC 1
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#endif
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#endif /* DEBUG_PROC */
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#if _lib_socketpair
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#if _sys_socket
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@ -60,8 +52,8 @@
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#include <sys/socket.h>
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#else
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#undef _lib_socketpair
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#endif
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#endif
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#endif /* _sys_socket */
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#endif /* _lib_socketpair */
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Proc_t proc_default = { -1 };
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@ -104,7 +96,7 @@ setopt(register void* a, register const void* p, register int n, const char* v)
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return 0;
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}
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#endif
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#endif /* DEBUG_PROC */
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#if _use_spawnveg
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@ -135,7 +127,7 @@ typedef struct Mod_s
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} Modify_t;
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#endif
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#endif /* _use_spawnveg */
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#ifdef SIGPIPE
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@ -150,7 +142,7 @@ ignoresig(int sig)
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signal(sig, ignoresig);
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}
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#endif
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#endif /* SIGPIPE */
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/*
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* do modification op and save previous state for restore()
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@ -159,13 +151,12 @@ ignoresig(int sig)
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static int
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modify(Proc_t* proc, int forked, int op, long arg1, long arg2)
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{
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#if _lib_fork
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if (forked)
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{
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int i;
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#ifndef TIOCSCTTY
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char* s;
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#endif
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#endif /* !TIOCSCTTY */
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switch (op)
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{
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@ -199,7 +190,7 @@ modify(Proc_t* proc, int forked, int op, long arg1, long arg2)
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return -1;
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if ((arg2 = open(s, O_RDWR)) < 0)
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return -1;
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#endif
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#endif /* TIOCSCTTY */
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for (i = 0; i <= 2; i++)
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if (arg1 != i && arg2 != i && fcntl(arg1, F_DUPFD, i) != i)
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return -1;
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@ -234,11 +225,6 @@ modify(Proc_t* proc, int forked, int op, long arg1, long arg2)
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}
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#if _use_spawnveg
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else
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#endif
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#else
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NoP(forked);
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#endif
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#if _use_spawnveg
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{
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register Modify_t* m;
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@ -266,7 +252,7 @@ modify(Proc_t* proc, int forked, int op, long arg1, long arg2)
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}
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#if F_dupfd_cloexec == F_DUPFD
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fcntl(m->save, F_SETFD, FD_CLOEXEC);
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#endif
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#endif /* F_dupfd_cloexec == F_DUPFD */
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close(arg2);
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if (fcntl(arg1, F_DUPFD, arg2) != arg2)
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return -1;
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@ -313,7 +299,7 @@ modify(Proc_t* proc, int forked, int op, long arg1, long arg2)
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}
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#else
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NoP(proc);
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#endif
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#endif /* _use_spawnveg */
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return 0;
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}
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@ -383,7 +369,7 @@ restore(Proc_t* proc)
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#define restore(p)
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#endif
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#endif /* _use_spawnveg */
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/*
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* fork and exec or spawn proc(argv) and return a Proc_t handle
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@ -410,38 +396,30 @@ procopen(const char* cmd, char** argv, char** envv, long* modv, int flags)
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char path[PATH_MAX];
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char env[PATH_MAX + 2];
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int pio[2];
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#if _lib_fork
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int pop[2];
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#endif
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#if !_pipe_rw && !_lib_socketpair
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int poi[2];
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#endif
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#endif /* !_pipe_rw && !_lib_socketpair */
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#if defined(SIGCHLD) && ( _lib_sigprocmask || _lib_sigsetmask )
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Sig_mask_t mask;
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#endif
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#endif /* defined(SIGCHLD) && ( _lib_sigprocmask || _lib_sigsetmask ) */
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#if _use_spawnveg
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int newenv = 0;
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#endif
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#endif /* _use_spawnveg */
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#if DEBUG_PROC
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int debug = PROC_OPT_EXEC;
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#endif
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#endif /* DEBUG_PROC */
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#if _lib_fork
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if (!argv && (flags & (PROC_ORPHAN|PROC_OVERLAY)))
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#else
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if (!argv || (flags & PROC_ORPHAN))
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#endif
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{
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errno = ENOEXEC;
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return 0;
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}
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pio[0] = pio[1] = -1;
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#if _lib_fork
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pop[0] = pop[1] = -1;
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#endif
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#if !_pipe_rw && !_lib_socketpair
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poi[0] = poi[1] = -1;
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#endif
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#endif /* !_pipe_rw && !_lib_socketpair */
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if (cmd && (!*cmd || !pathpath(cmd, NiL, PATH_REGULAR|PATH_EXECUTE, path, sizeof(path))))
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goto bad;
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switch (flags & (PROC_READ|PROC_WRITE))
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@ -476,7 +454,7 @@ procopen(const char* cmd, char** argv, char** envv, long* modv, int flags)
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#if _use_spawnveg
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if (!(flags & PROC_ORPHAN))
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newenv = 1;
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#endif
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#endif /* _use_spawnveg */
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}
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if (procfd >= 0)
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{
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@ -492,11 +470,11 @@ procopen(const char* cmd, char** argv, char** envv, long* modv, int flags)
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#else
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if (pipe(pio) || pipe(poi))
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goto bad;
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#endif
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#endif /* _lib_socketpair */
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}
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else if (pipe(pio))
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goto bad;
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#endif
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#endif /* _pipe_rw */
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}
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if (flags & PROC_OVERLAY)
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{
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@ -506,8 +484,7 @@ procopen(const char* cmd, char** argv, char** envv, long* modv, int flags)
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#if _use_spawnveg
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else if (argv && !(flags & PROC_ORPHAN))
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proc->pid = 0;
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#endif
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#if _lib_fork
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#endif /* _use_spawnveg */
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else
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{
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if (!(flags & PROC_FOREGROUND))
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@ -528,9 +505,9 @@ procopen(const char* cmd, char** argv, char** envv, long* modv, int flags)
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proc->mask = sigblock(mask);
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#else
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proc->sigchld = signal(SIGCHLD, SIG_DFL);
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#endif
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#endif
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#endif
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#endif /* _lib_sigsetmask */
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#endif /* _lib_sigprocmask */
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#endif /* defined(SIGCHLD) */
|
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}
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if ((flags & PROC_ORPHAN) && pipe(pop))
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goto bad;
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@ -558,15 +535,14 @@ procopen(const char* cmd, char** argv, char** envv, long* modv, int flags)
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#else
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if (proc->sigchld != SIG_IGN)
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signal(SIGCHLD, SIG_DFL);
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#endif
|
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#endif
|
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#endif
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#endif /* _lib_sigsetmask */
|
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#endif /* _lib_sigprocmask */
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#endif /* defined(SIGCHLD) */
|
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}
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else if (proc->pid == -1)
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goto bad;
|
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forked = 1;
|
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}
|
||||
#endif
|
||||
if (!proc->pid)
|
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{
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#if _use_spawnveg
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@ -574,8 +550,7 @@ procopen(const char* cmd, char** argv, char** envv, long* modv, int flags)
|
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char* oenviron0 = 0;
|
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v = 0;
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#endif
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#if _lib_fork
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#endif /* _use_spawnveg */
|
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if (flags & PROC_ORPHAN)
|
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{
|
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if (!(proc->pid = fork()))
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@ -590,10 +565,8 @@ procopen(const char* cmd, char** argv, char** envv, long* modv, int flags)
|
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_exit(EXIT_NOEXEC);
|
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}
|
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}
|
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#endif
|
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#if DEBUG_PROC
|
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stropt(getenv(PROC_ENV_OPTIONS), options, sizeof(*options), setopt, &debug);
|
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#if _lib_fork
|
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if (debug & PROC_OPT_TRACE)
|
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{
|
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if (!fork())
|
||||
|
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@ -604,30 +577,29 @@ procopen(const char* cmd, char** argv, char** envv, long* modv, int flags)
|
|||
}
|
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sleep(2);
|
||||
}
|
||||
#endif
|
||||
#endif
|
||||
#endif /* DEBUG_PROC */
|
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if (flags & PROC_DAEMON)
|
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{
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#ifdef SIGHUP
|
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modify(proc, forked, PROC_sig_ign, SIGHUP, 0);
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#endif
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#endif /* SIGHUP */
|
||||
modify(proc, forked, PROC_sig_dfl, SIGTERM, 0);
|
||||
#ifdef SIGTSTP
|
||||
modify(proc, forked, PROC_sig_ign, SIGTSTP, 0);
|
||||
#endif
|
||||
#endif /* SIGTSTP */
|
||||
#ifdef SIGTTIN
|
||||
modify(proc, forked, PROC_sig_ign, SIGTTIN, 0);
|
||||
#endif
|
||||
#endif /* SIGTTIN */
|
||||
#ifdef SIGTTOU
|
||||
modify(proc, forked, PROC_sig_ign, SIGTTOU, 0);
|
||||
#endif
|
||||
#endif /* SIGTTOU */
|
||||
}
|
||||
if (flags & (PROC_BACKGROUND|PROC_DAEMON))
|
||||
{
|
||||
modify(proc, forked, PROC_sig_ign, SIGINT, 0);
|
||||
#ifdef SIGQUIT
|
||||
modify(proc, forked, PROC_sig_ign, SIGQUIT, 0);
|
||||
#endif
|
||||
#endif /* SIGQUIT */
|
||||
}
|
||||
if (flags & (PROC_DAEMON|PROC_SESSION))
|
||||
modify(proc, forked, PROC_sys_pgrp, -1, 0);
|
||||
|
|
@ -657,7 +629,7 @@ procopen(const char* cmd, char** argv, char** envv, long* modv, int flags)
|
|||
goto cleanup;
|
||||
if (poi[1] != 0 && modify(proc, forked, PROC_fd_dup|PROC_FD_CHILD, poi[1], PROC_ARG_NULL))
|
||||
goto cleanup;
|
||||
#endif
|
||||
#endif /* _pipe_rw || _lib_socketpair */
|
||||
}
|
||||
else if (procfd >= 0)
|
||||
{
|
||||
|
|
@ -682,28 +654,23 @@ procopen(const char* cmd, char** argv, char** envv, long* modv, int flags)
|
|||
goto cleanup;
|
||||
break;
|
||||
}
|
||||
#if _lib_fork
|
||||
if (forked && (flags & PROC_ENVCLEAR))
|
||||
environ = 0;
|
||||
#if _use_spawnveg
|
||||
else
|
||||
#endif
|
||||
#endif
|
||||
#if _use_spawnveg
|
||||
if (newenv)
|
||||
else if (newenv)
|
||||
{
|
||||
p = environ;
|
||||
while (*p++);
|
||||
if (!(oenviron = (char**)memdup(environ, (p - environ) * sizeof(char*))))
|
||||
goto cleanup;
|
||||
}
|
||||
#endif
|
||||
#endif /* _use_spawnveg */
|
||||
if (argv && envv != (char**)environ)
|
||||
{
|
||||
#if _use_spawnveg
|
||||
if (!newenv && environ[0][0] == '_' && environ[0][1] == '=')
|
||||
oenviron0 = environ[0];
|
||||
#endif
|
||||
#endif /* _use_spawnveg */
|
||||
env[0] = '_';
|
||||
env[1] = '=';
|
||||
env[2] = 0;
|
||||
|
|
@ -717,10 +684,8 @@ procopen(const char* cmd, char** argv, char** envv, long* modv, int flags)
|
|||
if (!setenviron(*p++))
|
||||
goto cleanup;
|
||||
p = argv;
|
||||
#if _lib_fork
|
||||
if (forked && !p)
|
||||
return proc;
|
||||
#endif
|
||||
#if DEBUG_PROC
|
||||
if (!(debug & PROC_OPT_EXEC) || (debug & PROC_OPT_VERBOSE))
|
||||
{
|
||||
|
|
@ -737,7 +702,7 @@ sfsync(sfstderr);
|
|||
_exit(0);
|
||||
p = argv;
|
||||
}
|
||||
#endif
|
||||
#endif /* DEBUG_PROC */
|
||||
if (cmd)
|
||||
{
|
||||
strcpy(env + 2, path);
|
||||
|
|
@ -746,7 +711,7 @@ sfsync(sfstderr);
|
|||
#if _use_spawnveg
|
||||
else if ((proc->pid = spawnveg(path, p, environ, proc->pgrp, -1)) != -1)
|
||||
goto cleanup;
|
||||
#endif
|
||||
#endif /* _use_spawnveg */
|
||||
if (errno != ENOEXEC)
|
||||
goto cleanup;
|
||||
|
||||
|
|
@ -774,7 +739,7 @@ sfsync(sfstderr);
|
|||
#if _use_spawnveg
|
||||
else
|
||||
proc->pid = spawnveg(env + 2, p, environ, proc->pgrp, -1);
|
||||
#endif
|
||||
#endif /* _use_spawnveg */
|
||||
cleanup:
|
||||
if (forked)
|
||||
{
|
||||
|
|
@ -798,7 +763,7 @@ sfsync(sfstderr);
|
|||
restore(proc);
|
||||
if (flags & PROC_OVERLAY)
|
||||
exit(0);
|
||||
#endif
|
||||
#endif /* _use_spawnveg */
|
||||
}
|
||||
if (proc->pid != -1)
|
||||
{
|
||||
|
|
@ -820,9 +785,9 @@ sfsync(sfstderr);
|
|||
proc->mask = sigblock(mask);
|
||||
#else
|
||||
proc->sigchld = signal(SIGCHLD, SIG_DFL);
|
||||
#endif
|
||||
#endif
|
||||
#endif
|
||||
#endif /* _lib_sigsetmask */
|
||||
#endif /* _lib_sigprocmask */
|
||||
#endif /* defined(SIGCHLD) */
|
||||
}
|
||||
}
|
||||
else if (modv)
|
||||
|
|
@ -855,7 +820,7 @@ sfsync(sfstderr);
|
|||
if ((handler = signal(SIGPIPE, ignoresig)) != SIG_DFL && handler != ignoresig)
|
||||
signal(SIGPIPE, handler);
|
||||
}
|
||||
#endif
|
||||
#endif /* SIGPIPE */
|
||||
switch (procfd)
|
||||
{
|
||||
case 0:
|
||||
|
|
@ -868,7 +833,7 @@ sfsync(sfstderr);
|
|||
#else
|
||||
proc->wfd = poi[1];
|
||||
close(poi[0]);
|
||||
#endif
|
||||
#endif /* _pipe_rw || _lib_socketpair */
|
||||
/* FALLTHROUGH */
|
||||
case 1:
|
||||
proc->rfd = pio[0];
|
||||
|
|
@ -907,9 +872,9 @@ sfsync(sfstderr);
|
|||
#else
|
||||
if (proc->sigchld != SIG_DFL)
|
||||
signal(SIGCHLD, proc->sigchld);
|
||||
#endif
|
||||
#endif
|
||||
#endif
|
||||
#endif /* _lib_sigsetmask */
|
||||
#endif /* _lib_sigprocmask */
|
||||
#endif /* defined(SIGCHLD) */
|
||||
}
|
||||
if ((flags & PROC_CLEANUP) && modv)
|
||||
for (i = 0; n = modv[i]; i++)
|
||||
|
|
@ -936,7 +901,7 @@ sfsync(sfstderr);
|
|||
close(poi[0]);
|
||||
if (poi[1] >= 0)
|
||||
close(poi[1]);
|
||||
#endif
|
||||
#endif /* !_pipe_rw && !_lib_socketpair */
|
||||
procfree(proc);
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue