*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
* Copyright (C) 2006 Rob Landley
- * Copyright (C) 2006 Denis Vlasenko
+ * Copyright (C) 2006 Denys Vlasenko
*
- * Licensed under GPL version 2, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*/
-
-#include "busybox.h"
-
-/* All the functions starting with "x" call bb_error_msg_and_die() if they
- * fail, so callers never need to check for errors. If it returned, it
- * succeeded. */
-
-#ifndef DMALLOC
-/* dmalloc provides variants of these that do abort() on failure.
- * Since dmalloc's prototypes overwrite the impls here as they are
- * included after these prototypes in libbb.h, all is well.
+/* We need to have separate xfuncs.c and xfuncs_printf.c because
+ * with current linkers, even with section garbage collection,
+ * if *.o module references any of XXXprintf functions, you pull in
+ * entire printf machinery. Even if you do not use the function
+ * which uses XXXprintf.
+ *
+ * xfuncs.c contains functions (not necessarily xfuncs)
+ * which do not pull in printf, directly or indirectly.
+ * xfunc_printf.c contains those which do.
+ *
+ * TODO: move xmalloc() and xatonum() here.
*/
-// Die if we can't allocate size bytes of memory.
-void *xmalloc(size_t size)
-{
- void *ptr = malloc(size);
- if (ptr == NULL && size != 0)
- bb_error_msg_and_die(bb_msg_memory_exhausted);
- return ptr;
-}
-
-// Die if we can't resize previously allocated memory. (This returns a pointer
-// to the new memory, which may or may not be the same as the old memory.
-// It'll copy the contents to a new chunk and free the old one if necessary.)
-void *xrealloc(void *ptr, size_t size)
-{
- ptr = realloc(ptr, size);
- if (ptr == NULL && size != 0)
- bb_error_msg_and_die(bb_msg_memory_exhausted);
- return ptr;
-}
-#endif /* DMALLOC */
-
-// Die if we can't allocate and zero size bytes of memory.
-void *xzalloc(size_t size)
-{
- void *ptr = xmalloc(size);
- memset(ptr, 0, size);
- return ptr;
-}
-
-// Die if we can't copy a string to freshly allocated memory.
-char * xstrdup(const char *s)
-{
- char *t;
-
- if (s == NULL)
- return NULL;
-
- t = strdup(s);
-
- if (t == NULL)
- bb_error_msg_and_die(bb_msg_memory_exhausted);
+#include "libbb.h"
- return t;
-}
-
-// Die if we can't allocate n+1 bytes (space for the null terminator) and copy
-// the (possibly truncated to length n) string into it.
-char * xstrndup(const char *s, int n)
-{
- int m;
- char *t;
-
- if (ENABLE_DEBUG && s == NULL)
- bb_error_msg_and_die("xstrndup bug");
-
- /* We can just xmalloc(n+1) and strncpy into it, */
- /* but think about xstrndup("abc", 10000) wastage! */
- m = n;
- t = (char*) s;
- while (m) {
- if (!*t) break;
- m--;
- t++;
- }
- n -= m;
- t = xmalloc(n + 1);
- t[n] = '\0';
-
- return memcpy(t, s, n);
-}
-
-// Die if we can't open a file and return a FILE * to it.
-// Notice we haven't got xfread(), This is for use with fscanf() and friends.
-FILE *xfopen(const char *path, const char *mode)
-{
- FILE *fp = fopen(path, mode);
- if (fp == NULL)
- bb_perror_msg_and_die("%s", path);
- return fp;
-}
-
-// Die if we can't open an existing file and return an fd.
-int xopen(const char *pathname, int flags)
+/* Turn on nonblocking I/O on a fd */
+int FAST_FUNC ndelay_on(int fd)
{
- //if (ENABLE_DEBUG && (flags & O_CREAT))
- // bb_error_msg_and_die("xopen() with O_CREAT");
-
- return xopen3(pathname, flags, 0666);
+ int flags = fcntl(fd, F_GETFL);
+ if (flags & O_NONBLOCK)
+ return flags;
+ fcntl(fd, F_SETFL, flags | O_NONBLOCK);
+ return flags;
}
-// Die if we can't open a new file and return an fd.
-int xopen3(const char *pathname, int flags, int mode)
+int FAST_FUNC ndelay_off(int fd)
{
- int ret;
-
- ret = open(pathname, flags, mode);
- if (ret < 0) {
- bb_perror_msg_and_die("%s", pathname);
- }
- return ret;
+ int flags = fcntl(fd, F_GETFL);
+ if (!(flags & O_NONBLOCK))
+ return flags;
+ fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
+ return flags;
}
-// Turn on nonblocking I/O on a fd
-int ndelay_on(int fd)
+void FAST_FUNC close_on_exec_on(int fd)
{
- return fcntl(fd,F_SETFL,fcntl(fd,F_GETFL,0) | O_NONBLOCK);
+ fcntl(fd, F_SETFD, FD_CLOEXEC);
}
-int ndelay_off(int fd)
+char* FAST_FUNC strncpy_IFNAMSIZ(char *dst, const char *src)
{
- return fcntl(fd,F_SETFL,fcntl(fd,F_GETFL,0) & ~O_NONBLOCK);
-}
-
-// "Renumber" opened fd
-void xmove_fd(int from, int to)
-{
- if (from == to)
- return;
- if (dup2(from, to) != to)
- bb_perror_msg_and_die("cannot duplicate file descriptor");
- close(from);
-}
-
-// Die with an error message if we can't write the entire buffer.
-void xwrite(int fd, const void *buf, size_t count)
-{
- if (count) {
- ssize_t size = full_write(fd, buf, count);
- if (size != count)
- bb_error_msg_and_die("short write");
- }
-}
-
-// Die with an error message if we can't lseek to the right spot.
-off_t xlseek(int fd, off_t offset, int whence)
-{
- off_t off = lseek(fd, offset, whence);
- if (off == (off_t)-1) {
- if (whence == SEEK_SET)
- bb_perror_msg_and_die("lseek(%"OFF_FMT"u)", offset);
- bb_perror_msg_and_die("lseek");
- }
- return off;
-}
-
-// Die with supplied filename if this FILE * has ferror set.
-void die_if_ferror(FILE *fp, const char *fn)
-{
- if (ferror(fp)) {
- bb_error_msg_and_die("%s: I/O error", fn);
- }
-}
-
-// Die with an error message if stdout has ferror set.
-void die_if_ferror_stdout(void)
-{
- die_if_ferror(stdout, bb_msg_standard_output);
-}
-
-// Die with an error message if we have trouble flushing stdout.
-void xfflush_stdout(void)
-{
- if (fflush(stdout)) {
- bb_perror_msg_and_die(bb_msg_standard_output);
- }
-}
-
-// Wait for the specified child PID to exit, returning child's error return.
-int wait4pid(int pid)
-{
- int status;
-
- if (pid <= 0) {
- errno = ECHILD;
- return -1;
- }
- if (waitpid(pid, &status, 0) == -1)
- return -1;
- if (WIFEXITED(status))
- return WEXITSTATUS(status);
- if (WIFSIGNALED(status))
- return WTERMSIG(status) + 10000;
- return 0;
-}
-
-void xsetenv(const char *key, const char *value)
-{
- if (setenv(key, value, 1))
- bb_error_msg_and_die(bb_msg_memory_exhausted);
+#ifndef IFNAMSIZ
+ enum { IFNAMSIZ = 16 };
+#endif
+ return strncpy(dst, src, IFNAMSIZ);
}
-// Converts unsigned long long value into compact 4-char
-// representation. Examples: "1234", "1.2k", " 27M", "123T"
-// Fifth char is always '\0'
-void smart_ulltoa5(unsigned long long ul, char buf[5])
-{
- const char *fmt;
- char c;
- unsigned v,idx = 0;
- ul *= 10;
- if (ul > 9999*10) { // do not scale if 9999 or less
- while (ul >= 10000) {
- ul /= 1024;
- idx++;
- }
- }
- v = ul; // ullong divisions are expensive, avoid them
-
- fmt = " 123456789";
- if (!idx) { // 9999 or less: use 1234 format
- c = buf[0] = " 123456789"[v/10000];
- if (c != ' ') fmt = "0123456789";
- c = buf[1] = fmt[v/1000%10];
- if (c != ' ') fmt = "0123456789";
- buf[2] = fmt[v/100%10];
- buf[3] = "0123456789"[v/10%10];
- } else {
- if (v >= 10*10) { // scaled value is >=10: use 123M format
- c = buf[0] = " 123456789"[v/1000];
- if (c != ' ') fmt = "0123456789";
- buf[1] = fmt[v/100%10];
- buf[2] = "0123456789"[v/10%10];
- } else { // scaled value is <10: use 1.2M format
- buf[0] = "0123456789"[v/10];
- buf[1] = '.';
- buf[2] = "0123456789"[v%10];
- }
- // see http://en.wikipedia.org/wiki/Tera
- buf[3] = " kMGTPEZY"[idx];
- }
- buf[4] = '\0';
-}
-// Convert unsigned integer to ascii, writing into supplied buffer. A
-// truncated result is always null terminated (unless buflen is 0), and
-// contains the first few digits of the result ala strncpy.
-void BUG_sizeof_unsigned_not_4(void);
-char *utoa_to_buf(unsigned n, char *buf, unsigned buflen)
+/* Convert unsigned integer to ascii, writing into supplied buffer.
+ * A truncated result contains the first few digits of the result ala strncpy.
+ * Returns a pointer past last generated digit, does _not_ store NUL.
+ */
+char* FAST_FUNC utoa_to_buf(unsigned n, char *buf, unsigned buflen)
{
unsigned i, out, res;
- if (sizeof(unsigned) != 4)
- BUG_sizeof_unsigned_not_4();
+
if (buflen) {
out = 0;
- for (i = 1000000000; i; i /= 10) {
+
+ BUILD_BUG_ON(sizeof(n) != 4 && sizeof(n) != 8);
+ if (sizeof(n) == 4)
+ // 2^32-1 = 4294967295
+ i = 1000000000;
+#if UINT_MAX > 0xffffffff /* prevents warning about "const too large" */
+ else
+ if (sizeof(n) == 8)
+ // 2^64-1 = 18446744073709551615
+ i = 10000000000000000000;
+#endif
+ for (; i; i /= 10) {
res = n / i;
+ n = n % i;
if (res || out || i == 1) {
- if (!--buflen) break;
+ if (--buflen == 0)
+ break;
out++;
- n -= res*i;
*buf++ = '0' + res;
}
}
return buf;
}
-// Convert signed integer to ascii, like utoa_to_buf()
-char *itoa_to_buf(int n, char *buf, unsigned buflen)
+/* Convert signed integer to ascii, like utoa_to_buf() */
+char* FAST_FUNC itoa_to_buf(int n, char *buf, unsigned buflen)
{
- if (buflen && n<0) {
+ if (!buflen)
+ return buf;
+ if (n < 0) {
n = -n;
*buf++ = '-';
buflen--;
// The following two functions use a static buffer, so calling either one a
// second time will overwrite previous results.
//
-// The largest 32 bit integer is -2 billion plus null terminator, or 12 bytes.
-// Int should always be 32 bits on any remotely Unix-like system, see
-// http://www.unix.org/whitepapers/64bit.html for the reasons why.
+// The largest 32 bit integer is -2 billion plus NUL, or 1+10+1=12 bytes.
+// It so happens that sizeof(int) * 3 is enough for 32+ bit ints.
+// (sizeof(int) * 3 + 2 is correct for any width, even 8-bit)
-static char local_buf[12];
+static char local_buf[sizeof(int) * 3];
-// Convert unsigned integer to ascii using a static buffer (returned).
-char *utoa(unsigned n)
+/* Convert unsigned integer to ascii using a static buffer (returned). */
+char* FAST_FUNC utoa(unsigned n)
{
- *(utoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0';
+ *(utoa_to_buf(n, local_buf, sizeof(local_buf) - 1)) = '\0';
return local_buf;
}
-// Convert signed integer to ascii using a static buffer (returned).
-char *itoa(int n)
+/* Convert signed integer to ascii using a static buffer (returned). */
+char* FAST_FUNC itoa(int n)
{
- *(itoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0';
+ *(itoa_to_buf(n, local_buf, sizeof(local_buf) - 1)) = '\0';
return local_buf;
}
-// Emit a string of hex representation of bytes
-char *bin2hex(char *p, const char *cp, int count)
+/* Emit a string of hex representation of bytes */
+char* FAST_FUNC bin2hex(char *p, const char *cp, int count)
{
while (count) {
unsigned char c = *cp++;
return p;
}
-// Die with an error message if we can't set gid. (Because resource limits may
-// limit this user to a given number of processes, and if that fills up the
-// setgid() will fail and we'll _still_be_root_, which is bad.)
-void xsetgid(gid_t gid)
-{
- if (setgid(gid)) bb_error_msg_and_die("setgid");
-}
-
-// Die with an error message if we can't set uid. (See xsetgid() for why.)
-void xsetuid(uid_t uid)
-{
- if (setuid(uid)) bb_error_msg_and_die("setuid");
+/* Convert "[x]x[:][x]x[:][x]x[:][x]x" hex string to binary, no more than COUNT bytes */
+char* FAST_FUNC hex2bin(char *dst, const char *str, int count)
+{
+ errno = EINVAL;
+ while (*str && count) {
+ uint8_t val;
+ uint8_t c = *str++;
+ if (isdigit(c))
+ val = c - '0';
+ else if ((c|0x20) >= 'a' && (c|0x20) <= 'f')
+ val = (c|0x20) - ('a' - 10);
+ else
+ return NULL;
+ val <<= 4;
+ c = *str;
+ if (isdigit(c))
+ val |= c - '0';
+ else if ((c|0x20) >= 'a' && (c|0x20) <= 'f')
+ val |= (c|0x20) - ('a' - 10);
+ else if (c == ':' || c == '\0')
+ val >>= 4;
+ else
+ return NULL;
+
+ *dst++ = val;
+ if (c != '\0')
+ str++;
+ if (*str == ':')
+ str++;
+ count--;
+ }
+ errno = (*str ? ERANGE : 0);
+ return dst;
}
-// Return how long the file at fd is, if there's any way to determine it.
-off_t fdlength(int fd)
+/* Return how long the file at fd is, if there's any way to determine it. */
+#ifdef UNUSED
+off_t FAST_FUNC fdlength(int fd)
{
off_t bottom = 0, top = 0, pos;
long size;
else bottom = pos;
// If we can't, it's smaller.
-
} else {
if (bottom == top) {
if (!top) return 0;
return pos + 1;
}
-
-// Die with an error message if we can't malloc() enough space and do an
-// sprintf() into that space.
-char *xasprintf(const char *format, ...)
-{
- va_list p;
- int r;
- char *string_ptr;
-
-#if 1
- // GNU extension
- va_start(p, format);
- r = vasprintf(&string_ptr, format, p);
- va_end(p);
-#else
- // Bloat for systems that haven't got the GNU extension.
- va_start(p, format);
- r = vsnprintf(NULL, 0, format, p);
- va_end(p);
- string_ptr = xmalloc(r+1);
- va_start(p, format);
- r = vsnprintf(string_ptr, r+1, format, p);
- va_end(p);
#endif
- if (r < 0) bb_error_msg_and_die(bb_msg_memory_exhausted);
- return string_ptr;
-}
-
-#if 0 /* If we will ever meet a libc which hasn't [f]dprintf... */
-int fdprintf(int fd, const char *format, ...)
+int FAST_FUNC bb_putchar_stderr(char ch)
{
- va_list p;
- int r;
- char *string_ptr;
-
-#if 1
- // GNU extension
- va_start(p, format);
- r = vasprintf(&string_ptr, format, p);
- va_end(p);
-#else
- // Bloat for systems that haven't got the GNU extension.
- va_start(p, format);
- r = vsnprintf(NULL, 0, format, p);
- va_end(p);
- string_ptr = xmalloc(r+1);
- va_start(p, format);
- r = vsnprintf(string_ptr, r+1, format, p);
- va_end(p);
-#endif
-
- if (r >= 0) {
- full_write(fd, string_ptr, r);
- free(string_ptr);
- }
- return r;
+ return write(STDERR_FILENO, &ch, 1);
}
-#endif
-// Die with an error message if we can't copy an entire FILE * to stdout, then
-// close that file.
-void xprint_and_close_file(FILE *file)
+ssize_t FAST_FUNC full_write1_str(const char *str)
{
- fflush(stdout);
- // copyfd outputs error messages for us.
- if (bb_copyfd_eof(fileno(file), 1) == -1)
- exit(xfunc_error_retval);
-
- fclose(file);
+ return full_write(STDOUT_FILENO, str, strlen(str));
}
-// Die if we can't chdir to a new path.
-void xchdir(const char *path)
+ssize_t FAST_FUNC full_write2_str(const char *str)
{
- if (chdir(path))
- bb_perror_msg_and_die("chdir(%s)", path);
+ return full_write(STDERR_FILENO, str, strlen(str));
}
-// Print a warning message if opendir() fails, but don't die.
-DIR *warn_opendir(const char *path)
+static int wh_helper(int value, int def_val, const char *env_name, int *err)
{
- DIR *dp;
+ /* Envvars override even if "value" from ioctl is valid (>0).
+ * Rationale: it's impossible to guess what user wants.
+ * For example: "man CMD | ...": should "man" format output
+ * to stdout's width? stdin's width? /dev/tty's width? 80 chars?
+ * We _cant_ know it. If "..." saves text for e.g. email,
+ * then it's probably 80 chars.
+ * If "..." is, say, "grep -v DISCARD | $PAGER", then user
+ * would prefer his tty's width to be used!
+ *
+ * Since we don't know, at least allow user to do this:
+ * "COLUMNS=80 man CMD | ..."
+ */
+ char *s = getenv(env_name);
+ if (s) {
+ value = atoi(s);
+ /* If LINES/COLUMNS are set, pretend that there is
+ * no error getting w/h, this prevents some ugly
+ * cursor tricks by our callers */
+ *err = 0;
+ }
- dp = opendir(path);
- if (!dp)
- bb_perror_msg("cannot open '%s'", path);
- return dp;
+ if (value <= 1 || value >= 30000)
+ value = def_val;
+ return value;
}
-// Die with an error message if opendir() fails.
-DIR *xopendir(const char *path)
-{
- DIR *dp;
+/* It is perfectly ok to pass in a NULL for either width or for
+ * height, in which case that value will not be set. */
+int FAST_FUNC get_terminal_width_height(int fd, unsigned *width, unsigned *height)
+{
+ struct winsize win;
+ int err;
+ int close_me = -1;
+
+ if (fd == -1) {
+ if (isatty(STDOUT_FILENO))
+ fd = STDOUT_FILENO;
+ else
+ if (isatty(STDERR_FILENO))
+ fd = STDERR_FILENO;
+ else
+ if (isatty(STDIN_FILENO))
+ fd = STDIN_FILENO;
+ else
+ close_me = fd = open("/dev/tty", O_RDONLY);
+ }
+
+ win.ws_row = 0;
+ win.ws_col = 0;
+ /* I've seen ioctl returning 0, but row/col is (still?) 0.
+ * We treat that as an error too. */
+ err = ioctl(fd, TIOCGWINSZ, &win) != 0 || win.ws_row == 0;
+ if (height)
+ *height = wh_helper(win.ws_row, 24, "LINES", &err);
+ if (width)
+ *width = wh_helper(win.ws_col, 80, "COLUMNS", &err);
+
+ if (close_me >= 0)
+ close(close_me);
- dp = opendir(path);
- if (!dp)
- bb_perror_msg_and_die("cannot open '%s'", path);
- return dp;
+ return err;
+}
+int FAST_FUNC get_terminal_width(int fd)
+{
+ unsigned width;
+ get_terminal_width_height(fd, &width, NULL);
+ return width;
}
-// Die with an error message if we can't open a new socket.
-int xsocket(int domain, int type, int protocol)
+int FAST_FUNC tcsetattr_stdin_TCSANOW(const struct termios *tp)
{
- int r = socket(domain, type, protocol);
+ return tcsetattr(STDIN_FILENO, TCSANOW, tp);
+}
- if (r < 0) bb_perror_msg_and_die("socket");
+int FAST_FUNC get_termios_and_make_raw(int fd, struct termios *newterm, struct termios *oldterm, int flags)
+{
+//TODO: slattach, shell read might be adapted to use this too: grep for "tcsetattr", "[VTIME] = 0"
+ int r;
+ memset(oldterm, 0, sizeof(*oldterm)); /* paranoia */
+ r = tcgetattr(fd, oldterm);
+ *newterm = *oldterm;
+
+ /* Turn off buffered input (ICANON)
+ * Turn off echoing (ECHO)
+ * and separate echoing of newline (ECHONL, normally off anyway)
+ */
+ newterm->c_lflag &= ~(ICANON | ECHO | ECHONL);
+ if (flags & TERMIOS_CLEAR_ISIG) {
+ /* dont recognize INT/QUIT/SUSP chars */
+ newterm->c_lflag &= ~ISIG;
+ }
+ /* reads will block only if < 1 char is available */
+ newterm->c_cc[VMIN] = 1;
+ /* no timeout (reads block forever) */
+ newterm->c_cc[VTIME] = 0;
+/* IXON, IXOFF, and IXANY:
+ * IXOFF=1: sw flow control is enabled on input queue:
+ * tty transmits a STOP char when input queue is close to full
+ * and transmits a START char when input queue is nearly empty.
+ * IXON=1: sw flow control is enabled on output queue:
+ * tty will stop sending if STOP char is received,
+ * and resume sending if START is received, or if any char
+ * is received and IXANY=1.
+ */
+ if (flags & TERMIOS_RAW_CRNL_INPUT) {
+ /* IXON=0: XON/XOFF chars are treated as normal chars (why we do this?) */
+ /* dont convert CR to NL on input */
+ newterm->c_iflag &= ~(IXON | ICRNL);
+ }
+ if (flags & TERMIOS_RAW_CRNL_OUTPUT) {
+ /* dont convert NL to CR+NL on output */
+ newterm->c_oflag &= ~(ONLCR);
+ /* Maybe clear more c_oflag bits? Usually, only OPOST and ONLCR are set.
+ * OPOST Enable output processing (reqd for OLCUC and *NL* bits to work)
+ * OLCUC Map lowercase characters to uppercase on output.
+ * OCRNL Map CR to NL on output.
+ * ONOCR Don't output CR at column 0.
+ * ONLRET Don't output CR.
+ */
+ }
+ if (flags & TERMIOS_RAW_INPUT) {
+#ifndef IMAXBEL
+# define IMAXBEL 0
+#endif
+#ifndef IUCLC
+# define IUCLC 0
+#endif
+#ifndef IXANY
+# define IXANY 0
+#endif
+ /* IXOFF=0: disable sending XON/XOFF if input buf is full
+ * IXON=0: input XON/XOFF chars are not special
+ * BRKINT=0: dont send SIGINT on break
+ * IMAXBEL=0: dont echo BEL on input line too long
+ * INLCR,ICRNL,IUCLC: dont convert anything on input
+ */
+ newterm->c_iflag &= ~(IXOFF|IXON|IXANY|BRKINT|INLCR|ICRNL|IUCLC|IMAXBEL);
+ }
return r;
}
-// Die with an error message if we can't bind a socket to an address.
-void xbind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen)
+int FAST_FUNC set_termios_to_raw(int fd, struct termios *oldterm, int flags)
{
- if (bind(sockfd, my_addr, addrlen)) bb_perror_msg_and_die("bind");
-}
+ struct termios newterm;
-// Die with an error message if we can't listen for connections on a socket.
-void xlisten(int s, int backlog)
-{
- if (listen(s, backlog)) bb_perror_msg_and_die("listen");
+ get_termios_and_make_raw(fd, &newterm, oldterm, flags);
+ return tcsetattr(fd, TCSANOW, &newterm);
}
-// xstat() - a stat() which dies on failure with meaningful error message
-void xstat(const char *name, struct stat *stat_buf)
+pid_t FAST_FUNC safe_waitpid(pid_t pid, int *wstat, int options)
{
- if (stat(name, stat_buf))
- bb_perror_msg_and_die("can't stat '%s'", name);
+ pid_t r;
+
+ do
+ r = waitpid(pid, wstat, options);
+ while ((r == -1) && (errno == EINTR));
+ return r;
}
-// selinux_or_die() - die if SELinux is disabled.
-void selinux_or_die(void)
+pid_t FAST_FUNC wait_any_nohang(int *wstat)
{
-#if ENABLE_SELINUX
- int rc = is_selinux_enabled();
- if (rc == 0) {
- bb_error_msg_and_die("SELinux is disabled");
- } else if (rc < 0) {
- bb_error_msg_and_die("is_selinux_enabled() failed");
- }
-#else
- bb_error_msg_and_die("SELinux support is disabled");
-#endif
+ return safe_waitpid(-1, wstat, WNOHANG);
}
-/* It is perfectly ok to pass in a NULL for either width or for
- * height, in which case that value will not be set. */
-int get_terminal_width_height(const int fd, int *width, int *height)
+// Wait for the specified child PID to exit, returning child's error return.
+int FAST_FUNC wait4pid(pid_t pid)
{
- struct winsize win = { 0, 0, 0, 0 };
- int ret = ioctl(fd, TIOCGWINSZ, &win);
+ int status;
- if (height) {
- if (!win.ws_row) {
- char *s = getenv("LINES");
- if (s) win.ws_row = atoi(s);
- }
- if (win.ws_row <= 1 || win.ws_row >= 30000)
- win.ws_row = 24;
- *height = (int) win.ws_row;
+ if (pid <= 0) {
+ /*errno = ECHILD; -- wrong. */
+ /* we expect errno to be already set from failed [v]fork/exec */
+ return -1;
}
+ if (safe_waitpid(pid, &status, 0) == -1)
+ return -1;
+ if (WIFEXITED(status))
+ return WEXITSTATUS(status);
+ if (WIFSIGNALED(status))
+ return WTERMSIG(status) + 0x180;
+ return 0;
+}
- if (width) {
- if (!win.ws_col) {
- char *s = getenv("COLUMNS");
- if (s) win.ws_col = atoi(s);
- }
- if (win.ws_col <= 1 || win.ws_col >= 30000)
- win.ws_col = 80;
- *width = (int) win.ws_col;
- }
+// Useful when we do know that pid is valid, and we just want to wait
+// for it to exit. Not existing pid is fatal. waitpid() status is not returned.
+int FAST_FUNC wait_for_exitstatus(pid_t pid)
+{
+ int exit_status, n;
- return ret;
+ n = safe_waitpid(pid, &exit_status, 0);
+ if (n < 0)
+ bb_simple_perror_msg_and_die("waitpid");
+ return exit_status;
}
projects / oweals / busybox.git / blobdiff