532 lines
12 KiB
C
532 lines
12 KiB
C
/* Scheme48/scsh Unix system interface.
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** Routines that require custom C support.
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** Copyright (c) 1993,1994 by Olin Shivers.
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*/
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#include "sysdep.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/signal.h>
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#include <sys/types.h>
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#include <sys/times.h>
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#include <sys/time.h>
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#include <fcntl.h> /* for O_RDWR */
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#include <sys/stat.h>
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#include <sys/param.h> /* For gethostname() */
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#include <netdb.h>
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/* This lossage brought to you by Solaris and BIND */
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/* We thank Solaris for forcing users to get a new BIND */
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/* We thank BIND for blowing away the Solaris includea for MAXHOSTNAMELEN */
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#ifndef MAXHOSTNAMELEN
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#include <arpa/nameser.h>
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#ifndef MAXHOSTNAMELEN
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#define MAXHOSTNAMELEN MAXDNAME
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#endif
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#endif
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#include <pwd.h>
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#include <errno.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <string.h>
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#include <utime.h>
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#include "cstuff.h"
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#include "machine/stdio_dep.h"
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/* Make sure our exports match up w/the implementation: */
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#include "syscalls1.h"
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extern int errno;
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extern char **environ;
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/* Sux because it's dependent on 32-bitness. */
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#define hi8(i) (((i)>>24) & 0xff)
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#define lo24(i) ((i) & 0xffffff)
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#define comp8_24(hi, lo) (((hi)<<24) + (lo))
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/* Process stuff
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*******************************************************************************
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** wait, exec
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*/
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/* Args: pid, flags; returns [retval, status] */
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s48_value wait_pid(int pid, int flags, int *result_pid, int *status)
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{
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*result_pid = waitpid(pid, status, flags);
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return (*result_pid == -1) ? s48_enter_fixnum(errno) : S48_FALSE;
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}
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/* env: Scheme vector of Scheme strings, e.g., #("TERM=vt100" ...) or #T.
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** argv: Scheme vector of Scheme strings.
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** prog: String.
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**
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** We don't typecheck the args. You must do the typechecking
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** on the Scheme side.
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*/
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int scheme_exec(const char *prog, s48_value argv, s48_value env)
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{
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int i, j, e;
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int argc = S48_VECTOR_LENGTH(argv);
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char **unix_argv = Malloc(char*, argc+1);
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char **unix_env;
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if( unix_argv == NULL ) return errno;
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/* Scheme->Unix convert the argv parameter. */
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for(i=0; i<argc; i++)
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unix_argv[i] = cig_string_body(S48_VECTOR_REF(argv,i));
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unix_argv[argc] = NULL;
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/* Scheme->Unix convert the env parameter. */
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if( env == S48_TRUE ) unix_env = environ;
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else {
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int envlen = S48_VECTOR_LENGTH(env);
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unix_env = Malloc(char*, envlen+1);
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if( !unix_env ) goto lose;
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for(j=0; j<envlen; j++)
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unix_env[j] = cig_string_body(S48_VECTOR_REF(env,j));
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unix_env[envlen] = NULL;
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}
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execve(prog, unix_argv, unix_env); /* Do it. */
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if( env != S48_TRUE ) {
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e = errno;
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Free(unix_env);
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errno = e;
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}
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lose:
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e = errno;
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Free(unix_argv);
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return e;
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}
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/* Random file and I/O stuff
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*******************************************************************************
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*/
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/* Returns [errno, r, w] */
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int scheme_pipe(int *r, int *w)
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{
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int fds[2];
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if( pipe(fds) ) {
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*r = 0; *w = 0;
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return errno;
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}
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*r = fds[0]; *w = fds[1];
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return 0;
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}
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/* Read the symlink into static memory. Return NULL on error. */
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static char linkpath[MAXPATHLEN+1]; /* Maybe unaligned. Not reentrant. */
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char const *scm_readlink(const char *path)
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{
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int retval = readlink(path, linkpath, MAXPATHLEN);
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return (char const *)
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((retval == -1) ? NULL : ( linkpath[retval] = '\0', linkpath ));
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}
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/* Scheme interfaces to utime().
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** Complicated by need to pass real 32-bit quantities.
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*/
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int scm_utime(char const *path, int ac_hi, int ac_lo, int mod_hi, int mod_lo)
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{
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struct utimbuf t;
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t.actime = comp8_24(ac_hi, ac_lo);
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t.modtime = comp8_24(mod_hi, mod_lo);
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return utime(path, &t);
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}
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int scm_utime_now(char const *path) {return utime(path, 0);}
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int set_cloexec(int fd, int val)
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{
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int flags = fcntl(fd, F_GETFD);
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if( flags == -1 ) return errno;
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val = -val; /* 0 -> 0 and 1 -> -1 */
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/* If it's already what we want, just return. */
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if( (flags & FD_CLOEXEC) == (FD_CLOEXEC & val) ) return 0;
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flags = (flags & ~FD_CLOEXEC) | (val & FD_CLOEXEC);
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return fcntl(fd, F_SETFD, flags) ? errno : 0;
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}
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/* Two versions of CWD
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*******************************************************************************
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*/
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/* Posix rules: If PATH_MAX is defined, it's the length of longest path.
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** Otherwise, _POSIX_PATH_MAX = 255, and is a lower bound on said length.
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** I'm writing out 255 as a literal because HP-UX isn't finding
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** _POSIX_PATH_MAX.
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*/
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#ifdef PATH_MAX
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#define scsh_path_max (PATH_MAX)
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#else
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#define scsh_path_max (255)
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#endif
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/* Simple-minded POSIX version. */
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int scheme_cwd(const char **dirp)
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{
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char *buf;
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int size = scsh_path_max + 1; /* +1 for terminating nul byte... */
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buf = Malloc(char,size);
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if(!buf) goto lose;
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while( !getcwd(buf, size) )
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if( errno != ERANGE ) goto lose;
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else {
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/* Double the buf and retry. */
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char *nbuf = Realloc(char, buf, size += size);
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if( !nbuf ) goto lose;
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buf = nbuf;
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}
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*dirp = (const char*) buf; /* win */
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return 0;
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lose:
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{int e = errno;
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Free(buf);
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*dirp = 0;
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return e;}
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}
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#if 0
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/* Faster SUNOS version. */
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/* We have to use malloc, because the stub is going to free the string. */
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int scheme_cwd(const char **dirp)
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{
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char *buf = Malloc(char,MAXPATHLEN);
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int e;
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if( buf && getwd(buf) ) {
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*dirp = (const char*) buf;
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return 0;
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}
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/* lose */
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e = errno;
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Free(buf);
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*dirp = 0;
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return e;
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}
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#endif
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/* Process times
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*******************************************************************************
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*/
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/* Sleazing on the types here -- the ret values should be clock_t, not int,
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** but cig can't handle it.
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*/
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int process_times(int *utime, int *stime, int *cutime, int *cstime)
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{
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struct tms tms;
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clock_t t = times(&tms);
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if (t == -1) return -1;
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*utime = tms.tms_utime;
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*stime = tms.tms_stime;
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*cutime = tms.tms_cutime;
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*cstime = tms.tms_cstime;
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return t;
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}
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int cpu_clock_ticks_per_sec()
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{
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#ifdef _SC_CLK_TCK
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static long clock_tick = 0;
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if (clock_tick == 0)
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clock_tick = sysconf(_SC_CLK_TCK); /* POSIX.1, POSIX.2 */
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return clock_tick;
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#else
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#ifdef CLK_TCK
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return CLK_TCK;
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#else
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return 60;
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#endif
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#endif
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}
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/* Reading and writing
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*******************************************************************************
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*/
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/* Return a char, #f (EOF), or errno. */
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s48_value read_fdes_char(int fd)
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{
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int i; char c;
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if( (i=read(fd, &c, 1)) < 0 ) return s48_enter_fixnum(errno);
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if(i==0) return S48_FALSE;
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return s48_enter_char(c);
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}
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int write_fdes_char(char c, int fd) {return write(fd, &c, 1);}
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int read_fdes_substring(s48_value buf, int start, int end, int fd)
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{
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return read(fd, StrByte(buf,start), end-start);
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}
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int write_fdes_substring(s48_value buf, int start, int end, int fd)
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{
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return write(fd, StrByte(buf,start), end-start);
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}
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/*
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** Stat hackery
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*******************************************************************************
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** DANGER, WILL ROBINSON: It's not necessarily true that all these
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** stat fields will fit into a fixnum.
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** In fact, S48's 30 bit fixnums are almost certainly good enough
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** for everything but times. 30 signed bits ran out in 1987.
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** So the time fields are split, low 24, high everything else.
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** I haven't bothered w/anything else, since the only other real limit
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** is size -- files can't be bigger than .5Gb.
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*/
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/* S_ISSOCK(mode) and S_ISLNK(mode) are not POSIX. You lose on a NeXT. Ugh. */
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#ifndef S_ISSOCK
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#define S_ISSOCK(mode) (((mode) & S_IFMT) == S_IFSOCK)
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#endif
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#ifndef S_ISLNK
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#define S_ISLNK(mode) (((mode) & S_IFMT) == S_IFLNK)
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#endif
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#define low24(x) ((x) & 0xffffff)
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#define hi_but24(x) (((x) >> 24) & 0xff)
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/* Note that hi_but24 assumes value is a *32 bit* signed value. We have to
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** do this, because C's right-shift operator exposes word width. A suckful
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** language.
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*/
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/* Internal aux function -- loads stat values into Scheme vector: */
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static int really_stat(int retval, struct stat *s, s48_value vec)
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{
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int modes, typecode = -1;
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if( 14 != S48_VECTOR_LENGTH(vec) ) return -1;
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if( retval < 0 ) return errno;
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modes = s->st_mode;
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if( S_ISBLK(modes) ) typecode = 0;
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else if( S_ISCHR(modes) ) typecode = 1;
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else if( S_ISDIR(modes) ) typecode = 2;
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else if( S_ISFIFO(modes) ) typecode = 3;
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else if( S_ISREG(modes) ) typecode = 4;
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else if( S_ISSOCK(modes) ) typecode = 5;
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else if( S_ISLNK(modes) ) typecode = 6;
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S48_VECTOR_SET(vec,0,s48_enter_fixnum(typecode));
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S48_VECTOR_SET(vec,1, s48_enter_fixnum(s->st_dev));
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S48_VECTOR_SET(vec,2, s48_enter_fixnum(s->st_ino));
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S48_VECTOR_SET(vec,3, s48_enter_fixnum(s->st_mode));
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S48_VECTOR_SET(vec,4, s48_enter_fixnum(s->st_nlink));
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S48_VECTOR_SET(vec,5, s48_enter_fixnum(s->st_uid));
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S48_VECTOR_SET(vec,6, s48_enter_fixnum(s->st_gid));
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S48_VECTOR_SET(vec,7, s48_enter_fixnum(s->st_size));
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S48_VECTOR_SET(vec,8, s48_enter_fixnum( low24(s->st_atime)));
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S48_VECTOR_SET(vec,9, s48_enter_fixnum(hi_but24(s->st_atime)));
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S48_VECTOR_SET(vec,10, s48_enter_fixnum( low24(s->st_mtime)));
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S48_VECTOR_SET(vec,11, s48_enter_fixnum(hi_but24(s->st_mtime)));
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S48_VECTOR_SET(vec,12, s48_enter_fixnum( low24(s->st_ctime)));
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S48_VECTOR_SET(vec,13, s48_enter_fixnum(hi_but24(s->st_ctime)));
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/* We also used to do st_rdev, st_blksize, and st_blocks.
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These aren't POSIX, and, e.g., are not around on SGI machines.
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Too bad -- blksize is useful. Unix sux. */
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return 0;
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}
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int scheme_stat(const char *path, s48_value vec, int chase_p)
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{
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struct stat s;
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return really_stat(chase_p ? stat(path, &s) : lstat(path, &s), &s, vec);
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}
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int scheme_fstat(int fd, s48_value vec)
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{
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struct stat s;
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return really_stat(fstat(fd,&s), &s, vec);
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}
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/* Supplementary groups access
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*******************************************************************************
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*/
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int num_supp_groups(void)
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{
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return getgroups(0,NULL);
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}
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/* Load the supplementary groups into GVEC. */
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int get_groups(s48_value gvec)
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{
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int veclen = S48_VECTOR_LENGTH(gvec), i, retval;
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gid_t gvec0[20], *gp = gvec0;
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if( veclen > 20 )
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if( NULL == (gp=Malloc(gid_t,veclen)) ) return -1;
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retval = getgroups(veclen, gp);
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if( retval != -1 )
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for( i=veclen; i--; )
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S48_VECTOR_SET(gvec,i, s48_enter_fixnum(gp[i]));
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if( veclen > 20 ) Free(gp);
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return retval;
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}
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/* Environment hackery
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*******************************************************************************
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*/
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int put_env(const char *s)
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{
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char *s1 = Malloc(char, strlen(s)+1);
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if( !s1 ) return s48_enter_fixnum(errno);
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strcpy(s1, s);
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return putenv(s1) ? s48_enter_fixnum(errno) : S48_FALSE;
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}
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char** scm_envvec(int *len) /* Returns environ c-vector & its length. */
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{
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char **ptr=environ;
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while( *ptr ) ptr++;
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*len = ptr-environ;
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return(environ);
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}
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/* Load the (Scheme) strings in the (Scheme) vector VEC into environ.
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** Somewhat wasteful of memory: we do not free any of the memory
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** in the old environ -- don't know if it is being shared elsewhere.
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*/
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int install_env(s48_value vec)
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{
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int i, envsize;
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char **newenv;
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envsize = S48_VECTOR_LENGTH(vec);
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newenv = Malloc(char*, envsize+1);
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if( !newenv ) return errno;
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for( i=0; i<envsize; i++ ) {
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char *s = scheme2c_strcpy(S48_VECTOR_REF(vec,i));
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if (!s) {
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/* Return all the memory and bail out. */
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int e = errno;
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while(--i) Free(newenv[i]);
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Free(newenv);
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return e;
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}
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newenv[i] = s;
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}
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newenv[i] = NULL;
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environ = newenv;
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return 0;
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}
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/* Delete the env var. */
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void delete_env(const char *var)
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{
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int varlen = strlen(var);
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char **ptr = environ-1;
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do if( !*++ptr ) return;
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while( strncmp(*ptr, var, varlen) || (*ptr)[varlen] != '=' );
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do ptr[0] = ptr[1]; while( *++ptr );
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}
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/*****************************************************************************/
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/* N.B.: May be unaligned.
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** Not re-entrant, either -- will puke if multithreaded.
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*/
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static char hostname[MAXHOSTNAMELEN+1];
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char *scm_gethostname(void)
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{
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/* different OS's declare differently, so punt the prototype. */
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int gethostname();
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gethostname(hostname, MAXHOSTNAMELEN);
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return hostname;
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}
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#include <errno.h>
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char *errno_msg(int i)
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{
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#ifdef HAVE_STRERROR
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return(strerror(i));
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#else
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/* temp hack until we figure out what to do about losing sys_errlist's */
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extern
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#ifdef HAVE_CONST_SYS_ERRLIST
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const
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#endif
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char *sys_errlist[];
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extern int sys_nerr;
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return ( i < 0 || i > sys_nerr ) ? NULL /* i.e., #f */
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: (char*) sys_errlist[i];
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#endif /* !HAVE_STRERROR */
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}
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/* Some of fcntl()
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******************
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*/
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int fcntl_read(int fd, int command)
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{ return fcntl(fd, command); }
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int fcntl_write(int fd, int command, int value)
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{ return fcntl(fd, command, value); }
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