/*
* NAME
* if - conditional command
*
* SYNOPSIS
* if [expression [command [arg ...]]]
*
* DESCRIPTION
* See the if(1) manual page for full details.
*/
int
main(int argc, char **argv)
{
bool re; /* return value of expr() */
setmyerrexit(&ut_errexit);
setmyname(argv[0]);
setmypid(getpid());
ifeuid = geteuid();
/*
* Set-ID execution is not supported.
*/
if (ifeuid != getuid() || getegid() != getgid())
err(FC_ERR, FMT2S, getmyname(), ERR_SETID);
(void)sasignal(SIGCHLD, SIG_DFL);
if (argc > 1) {
ac = argc;
av = argv;
ap = 1;
re = expr();
if (re && ap < ac)
doex(!FORKED);
} else
re = false;
return re ? SH_TRUE : SH_FALSE;
}
/*
* Initialize the shell.
*/
static void
sh_init(const char *av0p)
{
struct stat sb;
int i;
setmyerrexit(&sh_errexit);
setmyname(av0p);
setmypid(getpid());
/*
* Set-ID execution is not supported.
*/
if (geteuid() != getuid() || getegid() != getgid())
err(SH_ERR, FMT1S, ERR_SETID);
/*
* Save the process ID of the shell as a 5-digit ASCII
* string (apid). Each occurrence of `$$' in a command
* line is substituted w/ the value of apid.
*/
i = snprintf(apid, sizeof(apid), "%05u", (unsigned)getmypid());
if (i < 0 || i >= (int)sizeof(apid))
*apid = EOS;
/*
* Fail if any of the descriptors 0, 1, or 2 is not open.
*/
for (i = 0; i < 3; i++)
if (fstat(i, &sb) == -1)
err(SH_ERR, "%u: %s\n", (unsigned)i, strerror(errno));
/*
* Set the SIGCHLD signal to its default action.
* Correct operation of the shell requires that zombies
* be created for its children when they terminate.
*/
(void)sasignal(SIGCHLD, SIG_DFL);
}
/*
* NAME
* fd2 - redirect from/to file descriptor 2
*
* SYNOPSIS
* fd2 [-e] [-f file] [--] command [arg ...]
*
* DESCRIPTION
* See the fd2(1) manual page for full details.
*/
int
main(int argc, char **argv)
{
bool eopt;
int efd, fd, nfd, ofd, opt;
char *file;
setmyerrexit(&ut_errexit);
setmyname(argv[0]);
setmypid(getpid());
/*
* Set-ID execution is not supported.
*/
if (geteuid() != getuid() || getegid() != getgid())
err(FC_ERR, FMT2S, getmyname(), ERR_SETID);
/*
* File descriptors 0, 1, and 2 must be open.
*/
for (fd = 0; fd < 3; fd++)
if (!fd_isopen(fd))
err(FC_ERR, "%s: %u: %s\n",
getmyname(), (unsigned)fd, strerror(errno));
ofd = FD1, efd = FD2;
eopt = false, file = NULL;
while ((opt = getopt(argc, argv, ":ef:")) != -1)
switch (opt) {
case 'e':
eopt = true;
break;
case 'f':
file = optarg;
break;
default:
usage();
}
argc -= optind;
argv += optind;
if (argc < 1)
usage();
if (file != NULL) {
if ((nfd = open(file, O_WRONLY|O_APPEND|O_CREAT, 0666)) == -1)
err(FC_ERR, FMT3S, getmyname(), file, ERR_CREATE);
if (dup2(nfd, efd) == -1)
err(FC_ERR, FMT2S, getmyname(), strerror(errno));
if (eopt && dup2(efd, ofd) == -1)
err(FC_ERR, FMT2S, getmyname(), strerror(errno));
(void)close(nfd);
} else {
if (eopt)
ofd = FD2, efd = FD1;
if (dup2(ofd, efd) == -1)
err(FC_ERR, FMT2S, getmyname(), strerror(errno));
}
/*
* Try to execute the specified command.
*/
(void)err_pexec(argv[0], argv);
/*NOTREACHED*/
return FC_ERR;
}
/*
* NAME
* glob - global command (file name generation)
*
* SYNOPSIS
* glob command [arg ...]
*
* DESCRIPTION
* See glob(1) the manual page for full details.
*/
int
main(int argc, char **argv)
{
const char **gav; /* points to generated argument vector */
int pmc = 0; /* pattern-match count */
int i;
const char **tav;
const char *cmd;
setmyerrexit(&ut_errexit);
setmyname(argv[0]);
setmypid(getpid());
/*
* Set-ID execution is not supported.
*/
if (geteuid() != getuid() || getegid() != getgid())
err(SH_ERR, FMT1S, ERR_SETID);
if (argc < 2)
err(SH_ERR, FMT1S, ERR_GARGCOUNT);
if ((gav = malloc(GAVNEW * sizeof(char *))) == NULL) {
err(SH_ERR, FMT1S, ERR_NOMEM);
/*NOTREACHED*/
}
*gav = NULL;
gavp = gav;
gave = &gav[GAVNEW - 1];
while (*++argv != NULL)
gav = glob1(gav, *argv, &pmc);
gavp = NULL;
if (pmc == 0) {
err(SH_ERR, FMT1S, ERR_NOMATCH);
/*NOTREACHED*/
}
cmd = gav[0];
if (IS_LIBEXEC(EQUAL)) {
for (i = 0; gav[i] != NULL; i++)
; /* nothing */
if ((tav = malloc((i + 1) * sizeof(char *))) == NULL) {
err(SH_ERR, FMT1S, ERR_NOMEM);
/*NOTREACHED*/
}
if (EQUAL(cmd, "fd2"))
tav[0] = FD2_PATH;
else if (EQUAL(cmd, "goto"))
tav[0] = GOTO_PATH;
else
tav[0] = IF_PATH;
cmd = tav[0];
(void)memcpy(&tav[1], &gav[1], i * sizeof(char *));
(void)err_pexec(cmd, (char *const *)tav);
} else
(void)err_pexec(cmd, (char *const *)gav);
/*NOTREACHED*/
return SH_ERR;
}
