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author | Mattias Andrée <maandree@member.fsf.org> | 2015-12-29 19:10:36 +0100 |
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committer | Mattias Andrée <maandree@member.fsf.org> | 2015-12-29 19:10:36 +0100 |
commit | e62485f489769af3cc35139170d217c674c60971 (patch) | |
tree | c306fa131cf00b38af4ef4ebab38fd195a1bc1d6 /src | |
parent | m (diff) | |
download | slibc-e62485f489769af3cc35139170d217c674c60971.tar.gz slibc-e62485f489769af3cc35139170d217c674c60971.tar.bz2 slibc-e62485f489769af3cc35139170d217c674c60971.tar.xz |
more functions to add + implement readn, writen, preadn, and pwriten
Signed-off-by: Mattias Andrée <maandree@member.fsf.org>
Diffstat (limited to 'src')
-rw-r--r-- | src/unistd/preadn.c | 75 | ||||
-rw-r--r-- | src/unistd/pwriten.c | 75 | ||||
-rw-r--r-- | src/unistd/readn.c | 73 | ||||
-rw-r--r-- | src/unistd/writen.c | 73 |
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; +} + |