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authorRob Landley2006-07-16 08:14:35 +0000
committerRob Landley2006-07-16 08:14:35 +0000
commit534374755d618c9c36c9940c82756241c4b25a67 (patch)
treefac906b4fa40a68c53cecf20215a7a25b3b1cab6 /libbb
parentafb94ecf2bb6c53ce2a381d6ce45a426243c76d9 (diff)
downloadbusybox-534374755d618c9c36c9940c82756241c4b25a67.zip
busybox-534374755d618c9c36c9940c82756241c4b25a67.tar.gz
Cleaup read() and write() variants, plus a couple of new functions like
xlseek and fdlength() for the new mkswap.
Diffstat (limited to 'libbb')
-rw-r--r--libbb/change_identity.c6
-rw-r--r--libbb/copyfd.c16
-rw-r--r--libbb/create_icmp6_socket.c2
-rw-r--r--libbb/create_icmp_socket.c2
-rw-r--r--libbb/full_read.c2
-rw-r--r--libbb/full_write.c2
-rw-r--r--libbb/loop.c1
-rw-r--r--libbb/xfuncs.c85
8 files changed, 84 insertions, 32 deletions
diff --git a/libbb/change_identity.c b/libbb/change_identity.c
index adebad8..74ffccb 100644
--- a/libbb/change_identity.c
+++ b/libbb/change_identity.c
@@ -46,10 +46,8 @@ const char *change_identity_e2str ( const struct passwd *pw )
return "cannot set groups";
endgrent ( );
- if ( setgid ( pw-> pw_gid ))
- return "cannot set group id";
- if ( setuid ( pw->pw_uid ))
- return "cannot set user id";
+ xsetgid(pw-> pw_gid);
+ xsetuid(pw->pw_uid);
return NULL;
}
diff --git a/libbb/copyfd.c b/libbb/copyfd.c
index e2c542e..0c4f7a0 100644
--- a/libbb/copyfd.c
+++ b/libbb/copyfd.c
@@ -30,24 +30,24 @@ static ssize_t bb_full_fd_action(int src_fd, int dst_fd, size_t size)
if (src_fd < 0) goto out;
while (!size || total < size)
{
- ssize_t wrote, xread;
+ ssize_t wr, rd;
- xread = safe_read(src_fd, buffer,
+ rd = safe_read(src_fd, buffer,
(!size || size - total > BUFSIZ) ? BUFSIZ : size - total);
- if (xread > 0) {
+ if (rd > 0) {
/* A -1 dst_fd means we need to fake it... */
- wrote = (dst_fd < 0) ? xread : bb_full_write(dst_fd, buffer, xread);
- if (wrote < xread) {
+ wr = (dst_fd < 0) ? rd : full_write(dst_fd, buffer, rd);
+ if (wr < rd) {
bb_perror_msg(bb_msg_write_error);
break;
}
- total += wrote;
+ total += wr;
if (total == size) status = 0;
- } else if (xread < 0) {
+ } else if (rd < 0) {
bb_perror_msg(bb_msg_read_error);
break;
- } else if (xread == 0) {
+ } else if (rd == 0) {
/* All done. */
status = 0;
break;
diff --git a/libbb/create_icmp6_socket.c b/libbb/create_icmp6_socket.c
index d8ff35a..c3d1b55 100644
--- a/libbb/create_icmp6_socket.c
+++ b/libbb/create_icmp6_socket.c
@@ -32,7 +32,7 @@ int create_icmp6_socket(void)
}
/* drop root privs if running setuid */
- setuid(getuid());
+ xsetuid(getuid());
return sock;
}
diff --git a/libbb/create_icmp_socket.c b/libbb/create_icmp_socket.c
index 26120a6..431c4d8 100644
--- a/libbb/create_icmp_socket.c
+++ b/libbb/create_icmp_socket.c
@@ -31,7 +31,7 @@ int create_icmp_socket(void)
}
/* drop root privs if running setuid */
- setuid(getuid());
+ xsetuid(getuid());
return sock;
}
diff --git a/libbb/full_read.c b/libbb/full_read.c
index 8d64bfb..b5837d5 100644
--- a/libbb/full_read.c
+++ b/libbb/full_read.c
@@ -17,7 +17,7 @@
* Returns the amount read, or -1 on an error.
* A short read is returned on an end of file.
*/
-ssize_t bb_full_read(int fd, void *buf, size_t len)
+ssize_t full_read(int fd, void *buf, size_t len)
{
ssize_t cc;
ssize_t total;
diff --git a/libbb/full_write.c b/libbb/full_write.c
index 3d6d401..d812d04 100644
--- a/libbb/full_write.c
+++ b/libbb/full_write.c
@@ -16,7 +16,7 @@
* This does multiple writes as necessary.
* Returns the amount written, or -1 on an error.
*/
-ssize_t bb_full_write(int fd, const void *buf, size_t len)
+ssize_t full_write(int fd, const void *buf, size_t len)
{
ssize_t cc;
ssize_t total;
diff --git a/libbb/loop.c b/libbb/loop.c
index b9caa97..0b05cd7 100644
--- a/libbb/loop.c
+++ b/libbb/loop.c
@@ -3,6 +3,7 @@
* Utility routines.
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ * Copyright (C) 2005 by Rob Landley <rob@landley.net>
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c
index d843414..8562a4f 100644
--- a/libbb/xfuncs.c
+++ b/libbb/xfuncs.c
@@ -120,40 +120,55 @@ int bb_xopen3(const char *pathname, int flags, int mode)
#endif
#ifdef L_xread
-ssize_t bb_xread(int fd, void *buf, size_t count)
+
+// Die with an error message if we can't read the entire buffer.
+
+void xread(int fd, void *buf, size_t count)
{
- ssize_t size;
+ while (count) {
+ ssize_t size;
- size = read(fd, buf, count);
- if (size < 0) {
- bb_perror_msg_and_die(bb_msg_read_error);
+ if ((size = safe_read(fd, buf, count)) < 1)
+ bb_error_msg_and_die("Short read");
+ count -= size;
+ buf = ((char *) buf) + size;
}
- return(size);
}
#endif
-#ifdef L_xread_all
-void bb_xread_all(int fd, void *buf, size_t count)
-{
- ssize_t size;
+#ifdef L_xwrite
+// Die with an error message if we can't write the entire buffer.
+
+void xwrite(int fd, void *buf, size_t count)
+{
while (count) {
- if ((size = bb_xread(fd, buf, count)) == 0) { /* EOF */
- bb_error_msg_and_die("Short read");
- }
+ ssize_t size;
+
+ if ((size = safe_write(fd, buf, count)) < 1)
+ bb_error_msg_and_die("Short write");
count -= size;
buf = ((char *) buf) + size;
}
- return;
+}
+#endif
+
+#ifdef L_xlseek
+
+// Die if we can't lseek to the right spot.
+
+void xlseek(int fd, off_t offset, int whence)
+{
+ if (whence != lseek(fd, offset, whence)) bb_error_msg_and_die("lseek");
}
#endif
#ifdef L_xread_char
-unsigned char bb_xread_char(int fd)
+unsigned char xread_char(int fd)
{
char tmp;
- bb_xread_all(fd, &tmp, 1);
+ xread(fd, &tmp, 1);
return(tmp);
}
@@ -294,3 +309,41 @@ void xsetuid(uid_t uid)
if (setuid(uid)) bb_error_msg_and_die("setuid");
}
#endif
+
+#ifdef L_fdlength
+off_t fdlength(int fd)
+{
+ off_t bottom = 0, top = 0, pos;
+ long size;
+
+ // If the ioctl works for this, return it.
+
+ if (ioctl(fd, BLKGETSIZE, &size) >= 0) return size*512;
+
+ // If not, do a binary search for the last location we can read.
+
+ do {
+ char temp;
+
+ pos = bottom + (top - bottom) / 2;;
+
+ // If we can read from the current location, it's bigger.
+
+ if (lseek(fd, pos, 0)>=0 && safe_read(fd, &temp, 1)==1) {
+ if (bottom == top) bottom = top = (top+1) * 2;
+ else bottom = pos;
+
+ // If we can't, it's smaller.
+
+ } else {
+ if (bottom == top) {
+ if (!top) return 0;
+ bottom = top/2;
+ }
+ else top = pos;
+ }
+ } while (bottom + 1 != top);
+
+ return pos + 1;
+}
+#endif