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authorSamuel Holland <samuel@sholland.org>2018-01-14 23:44:27 -0600
committerSamuel Holland <samuel@sholland.org>2018-01-15 00:43:49 -0600
commit2d70dfb7ae8a3da8015ee9195fa600bf77358764 (patch)
tree93e2d06768d6f1e49fbdffcc3af5012e0f1adfbe /libgcompat
parentd5183702e36eb43bbb0fa24e31048ca10553d3e9 (diff)
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unistd: Implement LSB functions plus more
On musl pread and pread64 are the same thing. Signed-off-by: Samuel Holland <samuel@sholland.org>
Diffstat (limited to 'libgcompat')
-rw-r--r--libgcompat/unistd.c172
1 files changed, 172 insertions, 0 deletions
diff --git a/libgcompat/unistd.c b/libgcompat/unistd.c
new file mode 100644
index 0000000..e19ec8e
--- /dev/null
+++ b/libgcompat/unistd.c
@@ -0,0 +1,172 @@
+#include <assert.h> /* assert */
+#include <limits.h> /* NGROUPS_MAX */
+#include <stddef.h> /* NULL, size_t */
+#include <unistd.h> /* confstr, getcwd, getgroups, ... */
+
+#include "alias.h" /* alias */
+
+/**
+ * Get configurable variables, with buffer overflow checking.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---confstr-chk-1.html
+ */
+size_t __confstr_chk(int name, char *buf, size_t len, size_t buflen)
+{
+ assert(buf != NULL ? buflen >= len : len == 0);
+
+ return confstr(name, buf, len);
+}
+
+/**
+ * Get the pathname of the current working directory, with buffer overflow
+ * checking.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---getcwd-chk-1.html
+ */
+char *__getcwd_chk(char *buf, size_t len, size_t buflen)
+{
+ assert(buf != NULL);
+ assert(buflen >= len);
+
+ return getcwd(buf, len);
+}
+
+/**
+ * Get supplementary group IDs, with buffer overflow checking.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---getgroups-chk-1.html
+ */
+int __getgroups_chk(int gidsetsize, gid_t *grouplist, size_t listlen)
+{
+ assert(grouplist != NULL);
+ assert(listlen / sizeof(*grouplist) >= (size_t) gidsetsize);
+
+ return getgroups(gidsetsize, grouplist);
+}
+
+/**
+ * Get name of current host, with buffer overflow checking.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---gethostname-chk-1.html
+ */
+int __gethostname_chk(char *name, size_t namelen, size_t buflen)
+{
+ assert(name != NULL);
+ assert(buflen >= namelen);
+
+ return gethostname(name, namelen);
+}
+
+/**
+ * Get login name, with buffer overflow checking.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---getlogin-r-chk-1.html
+ */
+int __getlogin_r_chk(char *name, size_t namelen, size_t buflen)
+{
+ assert(name != NULL);
+ assert(buflen >= namelen);
+
+ return getlogin_r(name, namelen);
+}
+
+/**
+ * Get memory page size.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---getpagesize.html
+ */
+int __getpagesize(void)
+{
+ return getpagesize();
+}
+
+/**
+ * Get the process group ID for a process.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---getpgid-1.html
+ */
+pid_t __getpgid(pid_t pid)
+{
+ return getpgid(pid);
+}
+
+/**
+ * Read from a file, with buffer overflow checking.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---pread-chk-1.html
+ */
+ssize_t __pread_chk(int fd, void *buf, size_t nbytes, off_t offset,
+ size_t buflen)
+{
+ assert(buf != NULL);
+ assert(buflen >= nbytes);
+
+ return pread(fd, buf, nbytes, offset);
+}
+alias(__pread_chk, __pread64_chk);
+
+/**
+ * Read from a file, with buffer overflow checking.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---read-chk-1.html
+ */
+ssize_t __read_chk(int fd, void *buf, size_t nbytes, size_t buflen)
+{
+ assert(buf != NULL);
+ assert(buflen >= nbytes);
+
+ return read(fd, buf, nbytes);
+}
+
+/**
+ * Read the contents of a symbolic link, with buffer overflow checking.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---readlink-chk-1.html
+ */
+ssize_t __readlink_chk(const char *path, char *buf, size_t len, size_t buflen)
+{
+ assert(buf != NULL);
+ assert(buflen >= len);
+
+ return readlink(path, buf, len);
+}
+
+/**
+ * Get configurable system variables.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---sysconf.html
+ */
+long __sysconf(int name)
+{
+ return sysconf(name);
+}
+
+/**
+ * Find the pathname of a terminal, with buffer overflow checking.
+ *
+ * LSB 5.0: LSB-Core-generic/baselib---ttyname-r-chk-1.html
+ */
+int __ttyname_r_chk(int fd, char *name, size_t namelen, size_t buflen)
+{
+ assert(name != NULL);
+ assert(buflen >= namelen);
+
+ return ttyname_r(fd, name, namelen);
+}
+
+/**
+ * Test whether a process is in a group.
+ */
+int group_member(gid_t gid)
+{
+ gid_t groups[NGROUPS_MAX];
+ int ngroups = getgroups(NGROUPS_MAX, groups);
+
+ for (int i = 0; i < ngroups; ++i) {
+ if (groups[i] == gid) {
+ return 1;
+ }
+ }
+
+ return 0;
+}