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-rw-r--r--src/unistd/preadn.c75
-rw-r--r--src/unistd/pwriten.c75
-rw-r--r--src/unistd/readn.c73
-rw-r--r--src/unistd/writen.c73
4 files changed, 296 insertions, 0 deletions
diff --git a/src/unistd/preadn.c b/src/unistd/preadn.c
new file mode 100644
index 0000000..d7da108
--- /dev/null
+++ b/src/unistd/preadn.c
@@ -0,0 +1,75 @@
+/**
+ * slibc — Yet another C library
+ * Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <unistd.h>
+#include <signal.h>
+
+
+
+/**
+ * Variant of `pread` that will read until the request
+ * amount of that has been read, or there is no more
+ * data to read. This function will block signals so
+ * that it cannot throw `EINTR`, which could mean that
+ * read data is lost. Note however, it may fail for
+ * any other reason resulting in lost data.
+ *
+ * This is a slibc extension.
+ *
+ * @etymology Variant of `(pread)` that reads all `(n)byte` bytes!
+ *
+ * @param fd The file descriptor whence the data shall be read.
+ * @param buf The buffer whither the read data shall be stored.
+ * @param nbyte The number of bytes to read.
+ * @param offset Whence in the file the read begins.
+ *
+ * @throws Any error specified for pread(3), except `EINTR`.
+ *
+ * @since Always.
+ */
+ssize_t preadn(int fd, void* buf, size_t nbyte, off_t offset)
+{
+ char *buffer = buf;
+ ssize_t r, n = 0;
+ sigset_t mask, oldmask;
+ int saved_errno = 0;
+
+ sigfillset(&mask);
+ sigprocmask(SIG_BLOCK, &mask, &oldmask);
+
+ while (nbyte)
+ {
+ r = pread(fildes, buffer, nbyte, offset);
+ if (r < 0)
+ goto fail;
+ if (r == 0)
+ break;
+ n += r;
+ nbyte -= (size_t)r;
+ offset += (off_t)r;
+ buffer += r;
+ }
+
+ sigprocmask(SIG_SETMASK, &oldmask, NULL);
+ return n;
+ fail:
+ errno = saved_errno;
+ sigprocmask(SIG_SETMASK, &oldmask, NULL);
+ saved_errno = errno;
+ return -1;
+}
+
diff --git a/src/unistd/pwriten.c b/src/unistd/pwriten.c
new file mode 100644
index 0000000..fefe537
--- /dev/null
+++ b/src/unistd/pwriten.c
@@ -0,0 +1,75 @@
+/**
+ * slibc — Yet another C library
+ * Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <unistd.h>
+#include <signal.h>
+
+
+
+/**
+ * Variant of `pwrite` that will write until all given
+ * data has been written. This function will block signals
+ * so that it cannot throw `EINTR`, which could mean that
+ * you do not know how much data has been successfully
+ * written. Note however, it may fail for any other reason
+ * resulting in the same problem.
+ *
+ * This is a slibc extension.
+ *
+ * @etymology Variant of `(pwrite)` that writes all `(n)byte` bytes!
+ *
+ * @param fd The file descriptor whither the data shall be write.
+ * @param buf The data to write.
+ * @param nbyte The number of bytes to write.
+ * @param offset Whence in the file the write begins.
+ *
+ * @throws Any error specified for pwrite(3), except `EINTR`.
+ *
+ * @since Always.
+ */
+ssize_t pwriten(int fd, const void* buf, size_t nbyte, off_t offset)
+{
+ const char *buffer = buf;
+ ssize_t r, n = 0;
+ sigset_t mask, oldmask;
+ int saved_errno = 0;
+
+ sigfillset(&mask);
+ sigprocmask(SIG_BLOCK, &mask, &oldmask);
+
+ while (nbyte)
+ {
+ r = pwrite(fildes, buffer, nbyte, offset);
+ if (r < 0)
+ goto fail;
+ if (r == 0)
+ break;
+ n += r;
+ nbyte -= (size_t)r;
+ offset += (off_t)r;
+ buffer += r;
+ }
+
+ sigprocmask(SIG_SETMASK, &oldmask, NULL);
+ return n;
+ fail:
+ errno = saved_errno;
+ sigprocmask(SIG_SETMASK, &oldmask, NULL);
+ saved_errno = errno;
+ return -1;
+}
+
diff --git a/src/unistd/readn.c b/src/unistd/readn.c
new file mode 100644
index 0000000..b50abe5
--- /dev/null
+++ b/src/unistd/readn.c
@@ -0,0 +1,73 @@
+/**
+ * slibc — Yet another C library
+ * Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <unistd.h>
+#include <signal.h>
+
+
+
+/**
+ * Variant of `read` that will read until the request
+ * amount of that has been read, or there is no more
+ * data to read. This function will block signals so
+ * that it cannot throw `EINTR`, which could mean that
+ * read data is lost. Note however, it may fail for
+ * any other reason resulting in lost data.
+ *
+ * This is a Plan 9 from Bell Labs compliant slibc extension.
+ *
+ * @etymology (Read) all `(n)byte` bytes!
+ *
+ * @param fd The file descriptor whence the data shall be read.
+ * @param buf The buffer whither the read data shall be stored.
+ * @param nbyte The number of bytes to read.
+ *
+ * @throws Any error specified for read(3), except `EINTR`.
+ *
+ * @since Always.
+ */
+ssize_t readn(int fd, void* buf, size_t nbyte)
+{
+ char *buffer = buf;
+ ssize_t r, n = 0;
+ sigset_t mask, oldmask;
+ int saved_errno = 0;
+
+ sigfillset(&mask);
+ sigprocmask(SIG_BLOCK, &mask, &oldmask);
+
+ while (nbyte)
+ {
+ r = read(fildes, buffer, nbyte);
+ if (r < 0)
+ goto fail;
+ if (r == 0)
+ break;
+ n += r;
+ nbyte -= (size_t)r;
+ buffer += r;
+ }
+
+ sigprocmask(SIG_SETMASK, &oldmask, NULL);
+ return n;
+ fail:
+ errno = saved_errno;
+ sigprocmask(SIG_SETMASK, &oldmask, NULL);
+ saved_errno = errno;
+ return -1;
+}
+
diff --git a/src/unistd/writen.c b/src/unistd/writen.c
new file mode 100644
index 0000000..8082b00
--- /dev/null
+++ b/src/unistd/writen.c
@@ -0,0 +1,73 @@
+/**
+ * slibc — Yet another C library
+ * Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <unistd.h>
+#include <signal.h>
+
+
+
+/**
+ * Variant of `write` that will write until all given
+ * data has been written. This function will block signals
+ * so that it cannot throw `EINTR`, which could mean that
+ * you do not know how much data has been successfully
+ * written. Note however, it may fail for any other reason
+ * resulting in the same problem.
+ *
+ * This is a slibc extension.
+ *
+ * @etymology (Write) all `(n)byte` bytes!
+ *
+ * @param fd The file descriptor whither the data shall be write.
+ * @param buf The data to write.
+ * @param nbyte The number of bytes to write.
+ *
+ * @throws Any error specified for write(3), except `EINTR`.
+ *
+ * @since Always.
+ */
+ssize_t writen(int fd, const void* buf, size_t nbyte);
+{
+ const char *buffer = buf;
+ ssize_t r, n = 0;
+ sigset_t mask, oldmask;
+ int saved_errno = 0;
+
+ sigfillset(&mask);
+ sigprocmask(SIG_BLOCK, &mask, &oldmask);
+
+ while (nbyte)
+ {
+ r = write(fildes, buffer, nbyte);
+ if (r < 0)
+ goto fail;
+ if (r == 0)
+ break;
+ n += r;
+ nbyte -= (size_t)r;
+ buffer += r;
+ }
+
+ sigprocmask(SIG_SETMASK, &oldmask, NULL);
+ return n;
+ fail:
+ errno = saved_errno;
+ sigprocmask(SIG_SETMASK, &oldmask, NULL);
+ saved_errno = errno;
+ return -1;
+}
+
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