75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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int shm_open(const char *, int, mode_t);
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int shm_unlink(const char *);
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#pragma GCC visibility push(hidden)
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int shm_open(const char *name, int oflag, mode_t mode)
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{
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size_t namelen;
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char *fname;
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int fd;
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/* Construct the filename. */
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while (name[0] == '/') ++name;
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if (name[0] == '\0') {
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/* The name "/" is not supported. */
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errno = EINVAL;
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return -1;
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}
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namelen = strlen(name);
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fname = (char *) alloca(sizeof("@TERMUX_PREFIX@/tmp/") - 1 + namelen + 1);
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memcpy(fname, "@TERMUX_PREFIX@/tmp/", sizeof("@TERMUX_PREFIX@/tmp/") - 1);
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memcpy(fname + sizeof("@TERMUX_PREFIX@/tmp/") - 1, name, namelen + 1);
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fd = open(fname, oflag, mode);
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if (fd != -1) {
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/* We got a descriptor. Now set the FD_CLOEXEC bit. */
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int flags = fcntl(fd, F_GETFD, 0);
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flags |= FD_CLOEXEC;
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flags = fcntl(fd, F_SETFD, flags);
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if (flags == -1) {
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/* Something went wrong. We cannot return the descriptor. */
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int save_errno = errno;
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close(fd);
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fd = -1;
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errno = save_errno;
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}
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}
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return fd;
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}
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int shm_unlink(const char *name)
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{
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size_t namelen;
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char *fname;
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/* Construct the filename. */
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while (name[0] == '/') ++name;
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if (name[0] == '\0') {
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/* The name "/" is not supported. */
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errno = EINVAL;
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return -1;
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}
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namelen = strlen(name);
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fname = (char *) alloca(sizeof("@TERMUX_PREFIX@/tmp/") - 1 + namelen + 1);
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memcpy(fname, "@TERMUX_PREFIX@/tmp/", sizeof("@TERMUX_PREFIX@/tmp/") - 1);
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memcpy(fname + sizeof("@TERMUX_PREFIX@/tmp/") - 1, name, namelen + 1);
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return unlink(fname);
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}
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#pragma GCC visibility pop
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